Directorio de artículos
- 1. ¿Qué es SpringMVC?
- 2. El primer programa MVC
- 3. Controlador y descansado
- 4. Procesamiento de datos y salto.
- 5. Procesamiento interactivo Json
- 6. SpringMVC: integrar SSM
-
- 6.1 Requisitos ambientales:
- 6.2 Crear base de datos
- 6.3 Dependencias de importación
- 6.4 Arquitectura básica y archivos de configuración.
- 6.5, capa Mybatis
- 6.6 Capa de primavera
- 6.7, capa SpringMVC
- Ideas para solucionar problemas
- 6.8 Buscar libros
- 6.9 Agregar libros
- 6.10 Modificar libros
- 6.11 Eliminar libros
- 6.12 Buscar libros
- 6.13 Mostrar todos los libros
- 7. Investigación Ajax
- 8. interceptor
1. ¿Qué es SpringMVC?
SpringMVC01: ¿Cuáles son
los supuestos de SpringMVC? ¿La arquitectura de su proyecto está diseñada o evolucionada?
- AlibabaPHP
- Con el creciente número de usuarios, Java
- Wang Jian va a la OIE
- MySQL·MySQL:MySQL->AliSQL、
- AliRedis·Todo en uno->Microservicios
Primero cree el proyecto SpringMVC e importe las dependencias.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>SpringMVC</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.2</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
</dependencies>
</project>
1.1 módulo springmvc-01-servvet
1. Módulo
2. ¡Agregue soporte para aplicaciones web!
3、pom.xml (springmvc-01-serlvet)
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>SpringMVC</artifactId>
<groupId>com.blue</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>springmvc-01-serlvet</artifactId>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2</version>
</dependency>
</dependencies>
</project>
4、HolaServlet
package com.blue.servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
//实现Servlet接口
public class HelloServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//取得参数
String method = req.getParameter("method");
if (method.equals("add")){
req.getSession().setAttribute("msg","执行了add方法");
}
if (method.equals("delete")){
req.getSession().setAttribute("msg","执行了delete方法");
}
//业务逻辑
//视图跳转
req.getRequestDispatcher("/WEB-INF/jsp/hello.jsp").forward(req,resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req,resp);
}
}
5 、 prueba
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
${msg}
</body>
</html>
6 、 web
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<servlet>
<servlet-name>hello</servlet-name>
<servlet-class>com.blue.servlet.HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>hello</servlet-name>
<url-pattern>hello</url-pattern>
</servlet-mapping>
</web-app>
7 、 de
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="/hello" method="post">
<input type="text" name="method">
<input type="submit">
</form>
</body>
</html>
8. Resultado
/hola
?método=eliminar
1.2 ¿Qué hace el marco MVC?
- Método para asignar URL a una clase java o clase java
- Encapsule los datos enviados por los usuarios.
- Procesar la solicitud – llamar al procesamiento comercial relacionado – encapsular los datos de respuesta
- Renderice los datos de respuesta.jsp/html y otros datos de la capa de presentación
1.3 Documentación
1.4 Atención
Si ocurre un problema 404, revise
y agregue todos los paquetes
2. El primer programa MVC
1.1, springmvc-02-hellomvc
1. Módulo
2、web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!--1.注册DispatcherServlet-->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--关联一个springmvc的配置文件:【servlet-name】-servlet.xml-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc-servlet.xml</param-value>
</init-param>
<!--启动级别-1-->
<load-on-startup>1</load-on-startup>
</servlet>
<!--/ 匹配所有的请求；（不包括.jsp）-->
<!--/* 匹配所有的请求；（包括.jsp）-->
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
3. springmvc-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>
<!--视图解析器:DispatcherServlet给他的ModelAndView-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="InternalResourceViewResolver">
<!--前缀-->
<property name="prefix" value="/WEB-INF/jsp/"/>
<!--后缀-->
<property name="suffix" value=".jsp"/>
</bean>
<!--Handler-->
<bean id="/hello" class="org.example.controller.HelloController"/>
</beans>
4、HolaController.java
package org.example.controller;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//注意：这里我们先导入Controller接口
public class HelloController implements Controller {
@Override
public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
//ModelAndView 模型和视图
ModelAndView mv = new ModelAndView();
//封装对象，放在ModelAndView中。Model
mv.addObject("msg","HelloSpringMVC!");
//封装要跳转的视图，放在ModelAndView中
mv.setViewName("hello"); //: /WEB-INF/jsp/hello.jsp
return mv;
}
}
5. Configuración de configuraciones
Configurar Tomcat
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
${msg}
</body>
</html>
Si se informa un error 404, significa que la dependencia de lib no está incluida.
6. Ver la estructura del proyecto
7. Resultado
¡éxito! Escribe /hola
1.2 Controlador central
El principio de SpringMVC se muestra en la siguiente figura:
cuando se inicia una solicitud, el controlador frontal intercepta la solicitud, genera una solicitud de proxy basada en los parámetros de la solicitud, encuentra el controlador real correspondiente a la solicitud y el controlador procesa la solicitud, crea un modelo de datos, accede a la base de datos y el modelo responde al controlador central, el controlador usa el modelo y la vista para representar los resultados de la vista, devuelve los resultados al controlador central y luego devuelve los resultados al solicitante .
HandlerMapping: asignador de procesador
HandlerAdapter: adaptador de procesador
viewResolver: resolución de vistas
La imagen muestra un diagrama de flujo más completo de SpringMVC. La línea continua indica la tecnología proporcionada por el marco SpringMVC y no requiere que los desarrolladores la implementen. La línea de puntos indica que los desarrolladores necesitan para implementarlo.
Proceso: primero solicite uno DispatherServlet, luego acceda y busque el controlador correspondiente /hellode acuerdo con la configuración en springmvc-servlet.xml , es decir , luego procese en la clase de controlador correspondiente, devuelva el modelo y luego asigne valores de acuerdo con el salte en el modelo Espere, el prefijo y sufijo configurados en springmvc-servlet.xml saltarán a la página correspondiente.<bean id="/hello" class="com.blue.controller.HelloController"/>com.blue.controller.HelloController
1.3 Estudio en profundidad de SpringMVC
DespachadorServlet
1 、 web
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!--1.配置 DispatcherServlet，这个是SpringMVC的核心：请求分发器，前端控制器-->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--DispatcherServlet要绑定springmvc的配置文件:【servlet-name】-servlet.xml-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc-servlet.xml</param-value>
</init-param>
<!--启动级别-1-->
<load-on-startup>1</load-on-startup>
</servlet>
<!--/ 匹配所有的请求；（不包括.jsp）,一般用这个-->
<!--/* 匹配所有的请求；（包括.jsp）-->
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
2、springmvc-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 处理器映射器 -->
<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
<!-- 处理器适配器 -->
<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>
<!--视图解析器:DispatcherServlet给他的ModelAndView-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="InternalResourceViewResolver">
<!--前缀-->
<property name="prefix" value="/WEB-INF/jsp/"/>
<!--后缀-->
<property name="suffix" value=".jsp"/>
</bean>
<!--Handler-->
<bean id="/hello" class="com.blue.controller.HelloController"/>
</beans>
3、HolaController.java
package org.example.controller;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//注意：这里我们先导入Controller接口
public class HelloController implements Controller {
@Override
public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
//ModelAndView 模型和视图
ModelAndView mv = new ModelAndView();
//封装对象，放在ModelAndView中。Model
mv.addObject("msg","HelloSpringMVC!");
//封装要跳转的视图，放在ModelAndView中
mv.setViewName("hello"); //: /WEB-INF/jsp/hello.jsp
return mv;
}
}
1.4 Utilice anotaciones para desarrollar SpringMVC
módulo
1.web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!--1.注册servlet-->
<servlet>
<servlet-name>SpringMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--通过初始化参数指定SpringMVC配置文件的位置，进行关联-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc-servlet.xml</param-value>
</init-param>
<!-- 启动顺序，数字越小，启动越早 -->
<load-on-startup>1</load-on-startup>
</servlet>
<!--所有请求都会被springmvc拦截 -->
<servlet-mapping>
<servlet-name>SpringMVC</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
2、springmvc-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 自动扫描包，让指定包下的注解生效,由IOC容器统一管理 -->
<context:component-scan base-package="com.blue.controller"/>
<!-- 让Spring MVC不处理静态资源 -->
<mvc:default-servlet-handler />
<!--
支持mvc注解驱动
在spring中一般采用@RequestMapping注解来完成映射关系
要想使@RequestMapping注解生效
必须向上下文中注册DefaultAnnotationHandlerMapping
和一个AnnotationMethodHandlerAdapter实例
这两个实例分别在类级别和方法级别处理。
而annotation-driven配置帮助我们自动完成上述两个实例的注入。
-->
<mvc:annotation-driven />
<!-- 视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
id="internalResourceViewResolver">
<!-- 前缀 -->
<property name="prefix" value="/WEB-INF/jsp/" />
<!-- 后缀 -->
<property name="suffix" value=".jsp" />
</bean>
</beans>
3、HolaControlador
package org.example.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
@RequestMapping("/hello")
public class HelloController {
//真实访问地址 : 项目名/hello/h1
@RequestMapping("/h1")
public String sayHello(Model model){
//封装数据
//向模型中添加属性msg与值，可以在JSP页面中取出并渲染
model.addAttribute("msg","hello,SpringMVCAnnotation!");
return "hello"; //web-inf/jsp/hello.jsp 会被视图解析器处理：
}
}
En el analizador de vistas, almacenamos todas las vistas en el directorio /WEB-INF/, lo que garantiza la seguridad de las vistas, porque el cliente no puede acceder directamente a los archivos de este directorio.
<%--
Created by IntelliJ IDEA.
User: dlmu
Date: 2022/4/11
Time: 16:25
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
${msg}
</body>
</html>
4. Ver la configuración de Tomcat
5. Agregue todos los paquetes a lib
6. Resultado
3. Controlador y descansado
El primer método: implementar la interfaz del controlador
módulo controlador springmvc-04
1 、 web
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
2、springmvc-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- <!– 自动扫描包，让指定包下的注解生效,由IOC容器统一管理 –>-->
<!-- <context:component-scan base-package="com.blue.controller"/>-->
<!-- <!– 让Spring MVC不处理静态资源 –>-->
<!-- <mvc:default-servlet-handler />-->
<!-- <mvc:annotation-driven />-->
<!-- 视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
id="internalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<bean name="/t1" class="org.example.controller.ControllerTest1"/>
</beans>
3、Prueba del controlador1
package org.example.controller;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//只要实现了ControlLer 接口的类。说明这就是一个控制器了
public class ControllerTest1 implements Controller {
@Override
public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
ModelAndView mv = new ModelAndView();
mv.addObject("msg","ControllerTest1");
mv.setViewName("test");
return mv;
}
}
4、prueba.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>SpringMVC</title>
</head>
<body>
${msg}
</body>
</html>
5. Resultado:
La segunda forma: use la anotación @Controller
1、Prueba del controlador2
package org.example.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@Controller //代表这个类会被spring接管
// 被这个注解的类 中的所有方法，如果返回值是spring，并且有具体的页面可以跳转
// 那么就会被视图解析器解析
public class ControllerTest2 {
@RequestMapping("/t2")
public String test1(Model model){
model.addAttribute("msg","ControllerTest2");
return "test";
}
}
2、springmvc-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 自动扫描包，让指定包下的注解生效,由IOC容器统一管理 -->
<context:component-scan base-package="org.example.controller"/>
<!-- 让Spring MVC不处理静态资源 -->
<!-- <mvc:default-servlet-handler />-->
<mvc:annotation-driven />
<!-- 视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
id="internalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
3. Resultado
correcto
Estilo descansado
Restful es un estilo de posicionamiento y operación de recursos. No es una norma ni un protocolo, sólo un estilo. El software diseñado en base a este estilo puede ser más simple, más jerárquico y más fácil de implementar mecanismos como el almacenamiento en caché.
Recursos de funciones
: todo lo que hay en Internet se puede abstraer en recursos
Operaciones de recursos: utilice POST, DELETE, PUT y GET para operar recursos utilizando diferentes métodos.
Correspondiente a agregar, eliminar, modificar y consultar respectivamente.
Manipula los recursos de la forma tradicional: ¡ consigue diferentes efectos a través de diferentes parámetros! Método único, publicar y obtener
http://127.0.0.1/item/queryItem.action?id=1 查询,GET
http://127.0.0.1/item/saveItem.action 新增,POST
http://127.0.0.1/item/updateItem.action 更新,POST
http://127.0.0.1/item/deleteItem.action?id=1 删除,GET或POST
Utilice RESTful para operar recursos: ¡ se pueden lograr diferentes efectos a través de diferentes métodos de solicitud! De la siguiente manera: ¡La dirección de solicitud es la misma, pero las funciones pueden ser diferentes!
http://127.0.0.1/item/1 查询,GET
http://127.0.0.1/item 新增,POST
http://127.0.0.1/item 更新,PUT
http://127.0.0.1/item/1 删除,DELETE
Controlador Restful
package com.blue.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class RestFulController {
//原来的： http://localhost:8080/add?a=1&b=2
//现在： http://localhost:8080/add/a/b
@RequestMapping("/add/{a}/{b}")
public String test1(@PathVariable int a,@PathVariable int b, Model model){
int res = a + b;
model.addAttribute("msg","结果为"+res);
return "test";
}
@RequestMapping("/add")
public String test2(int a, int b, Model model){
int res = a + b;
model.addAttribute("msg","结果为"+res);
return "test";
}
}
resultado
método de publicación
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="/add/1/3" method="post">
<input type="submit">
</form>
</body>
</html>
package com.blue.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class RestFulController {
//原来的： http://localhost:8080/add?a=1&b=2
//现在： http://localhost:8080/add/a/b
//http://localhost:8080/add/a/b
@RequestMapping("/add/{a}/{b}")
public String test1(@PathVariable int a,@PathVariable int b, Model model){
int res = a + b;
model.addAttribute("msg","结果1为"+res);
return "test";
}
//http://localhost:8080/add/1/3
@PostMapping("/add/{a}/{b}")
public String test3(@PathVariable int a,@PathVariable String b, Model model){
String res = a + b;
model.addAttribute("msg","结果2为"+res);
return "test";
}
}
resultado:
4. Procesamiento de datos y salto.
4.1 Método de salto de resultados
Modelo y vista
ModeloPrueba1
package com.blue.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
@Controller
public class ModelTest1 {
@RequestMapping("m1/t1")
public String test1(HttpServletRequest request, HttpServletResponse response){
HttpSession session = request.getSession();
System.out.println(session.getId());
return "test";
}
}
Revisar
package com.blue.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
@Controller
public class ModelTest1 {
@RequestMapping("m1/t1")
public String test1(Model model){
//转发
model.addAttribute("msg","ModelTest1");
return "forward:/WEB-INF/jsp/test.jsp";
}
@RequestMapping("/rsm/t3")
public String test3(){
//重定向
return "redirect:/test.jsp";
}
}
4.2 Procesamiento de datos
package com.blue.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
@RequestMapping("/user")
public class UserController {
// url: /user/t1?name=xxx 参数一致
@GetMapping("/t1")
public String test1(String name, Model model){
// 1. 接收前端参数
System.out.println("接收到前端的参数为"+name);
// 2. 将返回的结果传递纷前端， Model
model.addAttribute("msg",name);
// 3. 视图跳转
return "test";
}
}
@Controller
@RequestMapping("/user")
public class UserController {
@GetMapping("/t1")
// url: /user/t1?username=xxx 参数不一致
public String test1(@RequestParam("username") String name, Model model){
// 1. 接收前端参数
System.out.println("接收到前端的参数为"+name);
// 2. 将返回的结果传递纷前端， Model
model.addAttribute("msg",name);
// 3. 视图跳转
return "test";
}
}
/*
1. 接收前端用户传递的参数，判断参数的名字，假设名字直接在方法上，可以直接使用
2. 假设传递的是一个对象User,匹User对象中的字段名：如果名字一致则OK,否则，匹配不到
*/
@GetMapping("/t2")
public String test2(User user){
System.out.println(user);
return "test";
}
4.3 Problema de código confuso
pregunta:
formulario.jsp
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="/e/t1" method="get">
<input type="text" name="name">
<input type="submit">
</form>
</body>
</html>
Controlador de codificación
package com.blue.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PostMapping;
@Controller
public class EncodingController {
@GetMapping("/e/t1")
public String test1(String name, Model model){
System.out.println(name);
model.addAttribute("msg",name);
return "test";
}
}
El filtro resuelve caracteres confusos
Agregar filtro
EncodingFilter
package com.blue.filter;
import javax.servlet.*;
import java.io.IOException;
import java.util.logging.LogRecord;
public class EncodingFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
filterChain.doFilter(request,response);
}
@Override
public void destroy() {
}
}
web.jsp
<filter>
<filter-name>encoding</filter-name>
<filter-class>com.blue.filter.EncodingFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>encoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
Ingrese http://localhost:8080/form.jsp, ingrese y haga clic para enviar
el filtro del jefe
package com.kuang.filter;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import java.util.Map;
/**
* 解决get和post请求 全部乱码的过滤器
*/
public class GenericEncodingFilter implements Filter {
@Override
public void destroy() {
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
// 处理response的字符编码
HttpServletResponse myResponse = (HttpServletResponse) response;
myResponse.setContentType("text/html;charset=UTF-8");
// 转型为与协议相关对象
HttpServletRequest httpServletRequest = (HttpServletRequest) request;
// 对request包装增强
HttpServletRequest myrequest = new MyRequest(httpServletRequest);
chain.doFilter(myrequest, response);
}
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
}
// 自定义request对象，HttpServletRequest的包装类
class MyRequest extends HttpServletRequestWrapper {
private final HttpServletRequest request;
// 是否编码的标记
private boolean hasEncode;
// 定义一个可以传入HttpServletRequest对象的构造函数，以便对其进行装饰
public MyRequest(HttpServletRequest request) {
super(request);// super必须写
this.request = request;
}
// 对需要增强方法 进行覆盖
@Override
public Map getParameterMap() {
// 先获得请求方式
String method = request.getMethod();
if (method.equalsIgnoreCase("post")) {
// post请求
try {
// 处理post乱码
request.setCharacterEncoding("utf-8");
return request.getParameterMap();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
} else if (method.equalsIgnoreCase("get")) {
// get请求
Map<String, String[]> parameterMap = request.getParameterMap();
if (!hasEncode) {
// 确保get手动编码逻辑只运行一次
for (String parameterName : parameterMap.keySet()) {
String[] values = parameterMap.get(parameterName);
if (values != null) {
for (int i = 0; i < values.length; i++) {
// 处理get乱码
values[i] = new String(values[i]
.getBytes(StandardCharsets.ISO_8859_1), StandardCharsets.UTF_8);
}
}
}
hasEncode = true;
}
return parameterMap;
}
return super.getParameterMap();
}
// 取一个值
@Override
public String getParameter(String name) {
Map<String, String[]> parameterMap = getParameterMap();
String[] values = parameterMap.get(name);
if (values == null) {
return null;
}
return values[0]; // 取回参数的第一个值
}
// 取所有值
@Override
public String[] getParameterValues(String name) {
Map<String, String[]> parameterMap = getParameterMap();
String[] values = parameterMap.get(name);
return values;
}
}
}
5. Procesamiento interactivo Json
5.1 Dependencias de importación de Jackson Databind
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.13.1</version>
</dependency>
springmvc-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 自动扫描指定的包，下面所有注解类交给IOC容器管理 -->
<context:component-scan base-package="org.example.controller"/>
<!-- 视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
id="internalResourceViewResolver">
<!-- 前缀 -->
<property name="prefix" value="/WEB-INF/jsp/" />
<!-- 后缀 -->
<property name="suffix" value=".jsp" />
</bean>
<!-- <bean name="/t1" class="com.blue.controller.ControllerTest1"/>-->
</beans>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!--1.注册servlet-->
<servlet>
<servlet-name>SpringMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--通过初始化参数指定SpringMVC配置文件的位置，进行关联-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc-servlet.xml</param-value>
</init-param>
<!-- 启动顺序，数字越小，启动越早 -->
<load-on-startup>1</load-on-startup>
</servlet>
<!--所有请求都会被springmvc拦截 -->
<servlet-mapping>
<servlet-name>SpringMVC</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<filter>
<filter-name>encoding</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encoding</filter-name>
<url-pattern>/</url-pattern>
</filter-mapping>
</web-app>
Usuario
package org.example.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
private String name;
private int age;
private String sex;
}
Controlador de usuario
package org.example.controller;
import org.example.pojo.User;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
public class UserController {
@RequestMapping("/j1")
@ResponseBody //它就不会走视图解析器，会直接返回一个字符串
public String json1() throws JsonProcessingException {
//创建一个jackson的对象映射器，用来解析数据
ObjectMapper mapper = new ObjectMapper();
//创建一个对象
User user = new User("blue1号", 3, "女");
//将我们的对象解析成为json格式
String str = mapper.writeValueAsString(user);
//由于@ResponseBody注解，这里会将str转成json格式返回；十分方便
return str;
}
}
resultado:
5.2 Resolver el problema confuso de json
método uno
//produces:指定响应体返回类型和编码
@RequestMapping(value = "/json1",produces = "application/json;charset=utf-8")
Método dos
Agregue el siguiente código a springmvc-servlet.xml
<mvc:annotation-driven>
<mvc:message-converters register-defaults="true">
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<constructor-arg value="UTF-8"/>
</bean>
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="objectMapper">
<bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
<property name="failOnEmptyBeans" value="false"/>
</bean>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
5.3 Devolver cadena json para una solución unificada
1. Devolver varios objetos
package com.blue.controller;
import com.blue.pojo.User;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import java.util.ArrayList;
import java.util.List;
//@Controller
@RestController //只返回字符串
public class UserController {
//produces:指定响应体返回类型和编码
// @RequestMapping(value = "/j1",produces = "application/json;charset=utf-8")
@RequestMapping("/j1")
// @ResponseBody //它就不会走视图解析器，会直接返回一个字符串
public String json1() throws JsonProcessingException {
//创建一个jackson的对象映射器，用来解析数据
ObjectMapper mapper = new ObjectMapper();
//创建一个对象
User user = new User("blue1号", 3, "女");
//将我们的对象解析成为json格式
String str = mapper.writeValueAsString(user);
//由于@ResponseBody注解，这里会将str转成json格式返回；十分方便
return str;
}
@RequestMapping("/j2")
public String json2() throws JsonProcessingException {
//创建一个jackson的对象映射器，用来解析数据
ObjectMapper mapper = new ObjectMapper();
List<User> userList = new ArrayList<User>();
User user1 = new User("blue1", 3, "女");
User user2 = new User("blue1", 3, "女");
User user3 = new User("blue1", 3, "女");
User user4 = new User("blue1", 3, "女");
userList.add(user1);
userList.add(user2);
userList.add(user3);
userList.add(user4);
String str = mapper.writeValueAsString(userList);
return str;
}
}
2. Marca de tiempo predeterminada
@RequestMapping("/j3")
public String json3() throws JsonProcessingException {
ObjectMapper mapper = new ObjectMapper();
Date date = new Date();
return mapper.writeValueAsString(date);
}
3. Solución Java pura: marca de tiempo
@RequestMapping("/j3")
public String json3() throws JsonProcessingException {
ObjectMapper mapper = new ObjectMapper();
Date date = new Date();
// 自定义日期的格式
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
// ObjectMapper,时间解析后的默认格式为：Timestamp,时间戳
return mapper.writeValueAsString(sdf.format(date));
}
4. No utilizar marcas de tiempo
@RequestMapping("/j4")
public String json4() throws JsonProcessingException {
ObjectMapper mapper = new ObjectMapper();
//不使用 时间戳 的方式
mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS,false);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
mapper.setDateFormat(sdf);
Date date = new Date();
// ObjectMapper,时间解析后的默认格式为：Timestamp,时间戳
return mapper.writeValueAsString(date);
}
5. Herramientas
JsonUtils
package com.blue.utils;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import java.text.SimpleDateFormat;
public class JsonUtils {
public static String getJson(Object object) {
return getJson(object,"yyyy-MM-dd HH:mm:ss");
}
public static String getJson(Object object,String dateFormat) {
ObjectMapper mapper = new ObjectMapper();
//不使用时间差的方式
mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
//自定义日期格式对象
SimpleDateFormat sdf = new SimpleDateFormat(dateFormat);
//指定日期格式
mapper.setDateFormat(sdf);
try {
return mapper.writeValueAsString(object);
} catch (JsonProcessingException e) {
e.printStackTrace();
}
return null;
}
}
@RequestMapping("/j5")
public String json5() throws JsonProcessingException {
Date date = new Date();
String json = JsonUtils.getJson(date);
return json;
}
5.4、FastJson
fastjson.jar es un paquete desarrollado por Alibaba específicamente para el desarrollo de Java, que puede convertir fácilmente objetos json y objetos JavaBean, convertir objetos JavaBean y cadenas json, y convertir objetos json y cadenas json. Hay muchas formas de convertir json y el resultado final es el mismo.
package com.blue.controller;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.blue.pojo.User;
import java.util.ArrayList;
import java.util.List;
public class FastJsonDemo {
public static void main(String[] args) {
//创建一个对象
User user1 = new User("秦疆1号", 3, "男");
User user2 = new User("秦疆2号", 3, "男");
User user3 = new User("秦疆3号", 3, "男");
User user4 = new User("秦疆4号", 3, "男");
List<User> list = new ArrayList<User>();
list.add(user1);
list.add(user2);
list.add(user3);
list.add(user4);
System.out.println("*******Java对象 转 JSON字符串*******");
String str1 = JSON.toJSONString(list);
System.out.println("JSON.toJSONString(list)==>"+str1);
String str2 = JSON.toJSONString(user1);
System.out.println("JSON.toJSONString(user1)==>"+str2);
System.out.println("\n****** JSON字符串 转 Java对象*******");
User jp_user1=JSON.parseObject(str2,User.class);
System.out.println("JSON.parseObject(str2,User.class)==>"+jp_user1);
System.out.println("\n****** Java对象 转 JSON对象 ******");
JSONObject jsonObject1 = (JSONObject) JSON.toJSON(user2);
System.out.println("(JSONObject) JSON.toJSON(user2)==>"+jsonObject1.getString("name"));
System.out.println("\n****** JSON对象 转 Java对象 ******");
User to_java_user = JSON.toJavaObject(jsonObject1, User.class);
System.out.println("JSON.toJavaObject(jsonObject1, User.class)==>"+to_java_user);
}
}
@RequestMapping("/j6")
public String json6() throws JsonProcessingException {
List<User> userList = new ArrayList<User>();
User user1 = new User("blue1", 3, "女");
User user2 = new User("blue1", 3, "女");
User user3 = new User("blue1", 3, "女");
User user4 = new User("blue1", 3, "女");
userList.add(user1);
userList.add(user2);
userList.add(user3);
userList.add(user4);
String str = JSON.toJSONString(userList);
return str;
}
}
6. SpringMVC: integrar SSM
6.1 Requisitos ambientales:
- IDEA
- MySQL 5.7.19 (yo uso 8.0+)
- Gato 9
- Maven 3.6
Requisitos:
debe dominar la base de datos MySQL, conocimientos de Spring, JavaWeb y MyBatis y conocimientos simples de front-end;
6.2 Crear base de datos
CREATE DATABASE `ssmbuild`;
USE `ssmbuild`;
DROP TABLE IF EXISTS `books`;
CREATE TABLE `books` (
`bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '书id',
`bookName` VARCHAR(100) NOT NULL COMMENT '书名',
`bookCounts` INT(11) NOT NULL COMMENT '数量',
`detail` VARCHAR(200) NOT NULL COMMENT '描述',
KEY `bookID` (`bookID`)
) ENGINE=INNODB DEFAULT CHARSET=utf8
INSERT INTO `books`(`bookID`,`bookName`,`bookCounts`,`detail`)VALUES
(1,'Java',1,'从入门到放弃'),
(2,'MySQL',10,'从删库到跑路'),
(3,'Linux',5,'从进门到进牢');
6.3 Dependencias de importación
Cree un nuevo proyecto, importe las dependencias junit, mysql, c3p0, servlet, JSP, Mybatis, Spring y conéctese a la base de datos.
1. dependencia del archivo pom
<dependencies>
<!--Junit-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<!--数据库驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.28</version>
</dependency>
<!-- 数据库连接池 -->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.5</version>
</dependency>
<!--Servlet - JSP -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!--Mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.6</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.2</version>
</dependency>
<!--Spring-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.10</version>
</dependency>
</dependencies>
2. Base de datos
3. Problema de exportación de recursos estáticos de Maven
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>
6.4 Arquitectura básica y archivos de configuración.
Crear estructura de paquete
- com.kuang.pojo
- com.kuang.dao
- com.kuang.servicio
- com.kuang.controller
Archivo de configuración
- mybatis-config.xml
- aplicaciónContext.xml
- propiedades.base de datos
mybatis-config.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<typeAliases>
<package name="com.kuang.pojo"/>
</typeAliases>
</configuration>
aplicaciónContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
</beans>
propiedades.base de datos
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=root
6.5, capa Mybatis
Capa pojo de clase de entidad
Los campos son los mismos que en la base de datos.
package com.kuang.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
private int bookID;
private String bookName;
private int bookCounts;
private String detail;
}
Capa de interfaz dao
LibroMapper
package com.kuang.dao;
import com.kuang.pojo.Books;
import org.apache.ibatis.annotations.Param;
import java.util.List;
public interface BookMapper {
// 增加一本书
int addBook(Books books);
// 删除一本书,booId和id不一样，所以用个注解转换
int deleteBookById(@Param("bookId") int id);
//更新一本书
int updateBook(Books books);
// 查询一本书
Books queryBookById(@Param("bookId") int id);
// 查询全部的书
List<Books> queryAllBook();
}
LibroMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.kuang.dao.BookMapper">
<!--增加一个Book-->
<insert id="addBook" parameterType="Books">
insert into ssmbuild.books(bookName,bookCounts,detail)
values (#{bookName}, #{bookCounts}, #{detail})
</insert>
<!--根据id删除一个Book-->
<delete id="deleteBookById" parameterType="int">
delete from ssmbuild.books where bookID=#{bookID}
</delete>
<!--更新Book-->
<update id="updateBook" parameterType="Books">
update ssmbuild.books
set bookName = #{bookName},bookCounts = #{bookCounts},detail = #{detail}
where bookID = #{bookID}
</update>
<!--根据id查询,返回一个Book-->
<select id="queryBookById" resultType="Books">
select * from ssmbuild.books
where bookID = #{bookID}
</select>
<!--查询全部Book-->
<select id="queryAllBook" resultType="Books">
SELECT * from ssmbuild.books
</select>
</mapper>
Una vez escritos la interfaz mybatis-config.xml
y el asignador, deben vincularse a xml.
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- 配置数据源，交给 Spring 去做 -->
<typeAliases>
<package name="com.kuang.pojo"/>
</typeAliases>
<mappers>
<mapper class="com.kuang.dao.BookMapper"/>
</mappers>
</configuration>
Capa de servicios empresariales
Servicio de libros
package com.kuang.service;
import com.kuang.pojo.Books;
import java.util.List;
public interface BookService {
// 增加一本书
int addBook(Books books);
// 删除一本书，不是dao层，所以不用加注解@Para("bookId")
int deleteBookById(int id);
//更新一本书
int updateBook(Books books);
// 查询一本书
Books queryBookById(int id);
// 查询全部的书
List<Books> queryAllBook();
}
LibroServicioImpl
package com.kuang.service;
import com.kuang.dao.BookMapper;
import com.kuang.pojo.Books;
import java.util.List;
public class BookServiceImpl implements BookService{
// service调 dao层：组合Dao
private BookMapper bookMapper;
public void setBookMapper(BookMapper bookMapper) {
this.bookMapper = bookMapper;
}
@Override
public int addBook(Books books) {
return bookMapper.addBook(books);
}
@Override
public int deleteBookById(int id) {
return bookMapper.deleteBookById(id);
}
@Override
public int updateBook(Books books) {
return bookMapper.updateBook(books);
}
@Override
public Books queryBookById(int id) {
return bookMapper.queryBookById(id);
}
@Override
public List<Books> queryAllBook() {
return bookMapper.queryAllBook();
}
}
6.6 Capa de primavera
spring-dao.xml
configura esta mañana y tarde en el applicationContext.xmlcontexto anterior
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd">
<!-- 配置整合mybatis -->
<!-- 1.关联数据库文件 -->
<context:property-placeholder location="classpath:database.properties"/>
<!-- 2.数据库连接池 -->
<!--数据库连接池
dbcp 半自动化操作 不能自动连接
c3p0 自动化操作（自动的加载配置文件 并且设置到对象里面）
-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!-- 配置连接池属性 -->
<property name="driverClass" value="${jdbc.driver}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<!-- c3p0连接池的私有属性 -->
<property name="maxPoolSize" value="30"/>
<property name="minPoolSize" value="10"/>
<!-- 关闭连接后不自动commit -->
<property name="autoCommitOnClose" value="false"/>
<!-- 获取连接超时时间 -->
<property name="checkoutTimeout" value="10000"/>
<!-- 当获取连接失败重试次数 -->
<property name="acquireRetryAttempts" value="2"/>
</bean>
<!-- 3.配置SqlSessionFactory对象 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 注入数据库连接池 -->
<property name="dataSource" ref="dataSource"/>
<!-- 配置MyBaties全局配置文件:mybatis-config.xml -->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>
<!-- 4.配置扫描Dao接口包，动态实现Dao接口注入到spring容器中 -->
<!--解释 ：https://www.cnblogs.com/jpfss/p/7799806.html-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 注入sqlSessionFactory -->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<!-- 给出需要扫描Dao接口包 -->
<property name="basePackage" value="com.kuang.dao"/>
</bean>
</beans>
servicio de primavera.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 1. 扫描service相关的bean -->
<context:component-scan base-package="com.kuang.service" />
<!--2. BookServiceImpl注入到IOC容器中-->
<bean id="BookServiceImpl" class="com.kuang.service.BookServiceImpl">
<property name="bookMapper" ref="bookMapper"/>
</bean>
<!-- 3. 配置事务管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!-- 注入数据库连接池 -->
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
Si el contexto configurado no se integra automáticamente, puede importarlo manualmente.
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<import resource="classpath:spring-dao.xml"/>
<import resource="classpath:spring-service.xml"/>
<import resource="classpath:spring-mvc.xml"/>
</beans>
6.7, capa SpringMVC
¡Agregue soporte para marcos web!
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!--DispatcherServlet-->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<!--一定要注意:我们这里加载的是总的配置文件，之前被这里坑了！-->
<param-value>classpath:applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!--乱码过滤 encodingFilter-->
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>
org.springframework.web.filter.CharacterEncodingFilter
</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--Session过期时间-->
<session-config>
<session-timeout>15</session-timeout>
</session-config>
</web-app>
primavera-mvc.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 配置SpringMVC -->
<!-- 1.开启SpringMVC注解驱动 -->
<mvc:annotation-driven />
<!-- 2.静态资源默认servlet配置-->
<mvc:default-servlet-handler/>
<!-- 3.配置jsp 显示ViewResolver视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<!-- 4.扫描web相关的bean -->
<context:component-scan base-package="com.kuang.controller" />
</beans>
Controlador de libro
package com.kuang.controller;
import com.kuang.pojo.Books;
import com.kuang.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.List;
@Controller
@RequestMapping("/book")
public class BookController {
@Autowired
@Qualifier("BookServiceImpl")
private BookService bookService;
@RequestMapping("/allBook")
public String list(Model model) {
List<Books> list = bookService.queryAllBook();
model.addAttribute("list", list);
return "allBook";
}
}
todoLibro.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>书籍展示</title>
</head>
<body>
<h1>书籍展示</h1>
</body>
</html>
índice.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>首页</title>
</head>
<body>
<h3>
<a href="${pageContext.request.contextPath}/book/allBook">进入书籍页面</a>
</h3>
</body>
</html>
Ideas para solucionar problemas
Problema: No se puede iniciar, el artefacto ssmbuild:war explotó: se produjo un error al implementar el artefacto. Consulte los registros del servidor para obtener más detalles.
Cree lib en wen-inf y agregue recursos estáticos de maven
Problema: el frijol no existe (500)
Pasos:
1. ¡Compruebe si la inyección de frijoles fue exitosa!
2. ¡Prueba unitaria Junit para ver si nuestro código puede consultar los resultados!
import com.kuang.pojo.Books;
import com.kuang.service.BookService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MyTest {
@Test
public void test(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
BookService bookServiceImpl = (BookService) context.getBean("BookServiceImpl");
for (Books books:bookServiceImpl.queryAllBook()){
System.out.println(books);
}
}
}
3. ¡El problema no debe estar en nuestra capa inferior, sino en la primavera!
4. SpringMVC, nuestro servicio. Los beans de capa no fueron llamados durante la integración.
- applicationContext.xml no inyecta beans
- ¡En web.xml, también hemos vinculado el archivo de configuración! Encontré el problema: configuramos Spring-mvc.Xml y, de hecho, no contiene ningún bean de servicio, por lo que se informa un puntero nulo.
- Entonces, en web.xml
<param-value>classpath:applicationContext.xml</param-value>en lugar de<param-value>classpath:spring-mvc.xml</param-value>
6.8 Buscar libros
índice.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>首页</title>
<style>
a{
text-decoration: none;
color: blue;
font-size: 18px;
}
h3{
width: 180px;
height: 38px;
margin: 100px auto;
text-align: center;
line-height: 38px;
background: deepskyblue;
border-radius: 5px;
}
</style>
</head>
<body>
<h3>
<a href="${pageContext.request.contextPath}/book/allBook">进入书籍页面</a>
</h3>
</body>
</html>
Para encontrar BootStrap CDN, busque
<!-- 新 Bootstrap 核心 CSS 文件 -->
<link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<!-- jQuery文件。务必在bootstrap.min.js 之前引入 -->
<script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
<!-- 最新的 Bootstrap 核心 JavaScript 文件 -->
<script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
todolibro.jsp
- Primero importe <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> y coloque la primera línea
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>书籍展示</title>
<!-- 新 Bootstrap 核心 CSS 文件 -->
<link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<!-- jQuery文件。务必在bootstrap.min.js 之前引入 -->
<script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
<!-- 最新的 Bootstrap 核心 JavaScript 文件 -->
<script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<div class="row clearfix">
<div class="col-md-12 column">
<div class="page-header">
<h1>
<small>书籍列表 —— 显示所有书籍</small>
</h1>
</div>
</div>
</div>
<div class="row clearfix">
<div class="col-md-12 column">
<table class="table table-hover table-striped">
<thead>
<tr>
<th>书籍编号</th>
<th>书籍名字</th>
<th>书籍数量</th>
<th>书籍详情</th>
<th>操作</th>
</tr>
</thead>
<%-- 书籍从数据库中查询出来，从这个List中遍历出来：foreach --%>
<tbody>
<%-- <c:forEach var="book" items="${requestScope.get('list')}">--%>
<c:forEach var="book" items="${requestScope.get('list')}">
<tr>
<td>${book.getBookID()}</td>
<td>${book.getBookName()}</td>
<td>${book.getBookCounts()}</td>
<td>${book.getDetail()}</td>
</tr>
</c:forEach>
</tbody>
</table>
</div>
</div>
</div>
</body>
</html>
6.9 Agregar libros
todoLibro.jsp
<div class="row">
<div class="col-md-4 column">
<a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a>
</div>
</div>
LibroController.java
// 跳转到增加书籍页面
@RequestMapping("/toAddBook")
public String toAddPaper(){
return "addBook";
}
// 添加书籍
@RequestMapping("/addBook")
public String addBook(Books books){
System.out.println("addBook=>"+books);
bookService.addBook(books);
return "redirect:/book/allBook";
}
addBook.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>书籍展示</title>
<%-- BootStrap美化界面 --%>
<link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
<div class="row clearfix">
<div class="col-md-12 column">
<div class="page-header">
<h1>
<small>新增书籍</small>
</h1>
</div>
</div>
</div>
<form action="${pageContext.request.contextPath}/book/addBook" method="post">
<div class="form-group">
<label>书籍名称</label>
<input type="text" name="bookName" class="form-control" required>
</div>
<div class="form-group">
<label>书籍数量</label>
<input type="text" name="bookCounts" class="form-control" required>
</div>
<div class="form-group">
<label>书籍描述</label>
<input type="text" name="detail" class="form-control" required>
</div>
<div class="form-group">
<input type="submit" class="form-control" value="添加">
</div>
</form>
</div>
</body>
</html>
resultado
6.10 Modificar libros
todoLibro.jsp
<tbody>
<c:forEach var="book" items="${requestScope.get('list')}">
<tr>
<td>${book.getBookID()}</td>
<td>${book.getBookName()}</td>
<td>${book.getBookCounts()}</td>
<td>${book.getDetail()}</td>
<td>
<a href="${pageContext.request.contextPath}/book/toUpdateBook?id=${book.getBookID()}">修改</a> |
</td>
</tr>
</c:forEach>
</tbody>
LibroController.java
//修改书籍
@RequestMapping("/updateBook")
public String updateBook( Books books) {
System.out.println("updateBook=>"+books);
int i =bookService.updateBook(books);
if (i > 0) {
System.out.println("添加books成功"+books);
}
return "redirect:/book/allBook";
}
actualizarBook.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>修改书籍信息</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- 引入 Bootstrap -->
<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
<div class="row clearfix">
<div class="col-md-12 column">
<div class="page-header">
<h1>
<small>修改书籍</small>
</h1>
</div>
</div>
</div>
<form action="${pageContext.request.contextPath}/book/" method="post">
<div class="form-group">
<label>书籍名称</label>
<input type="text" name="bookName" class="form-control" value="${QBook.bookName}" required>
</div>
<div class="form-group">
<label>书籍数量</label>
<input type="text" name="bookCounts" class="form-control" value="${QBook.bookCounts}" required>
</div>
<div class="form-group">
<label>书籍描述</label>
<input type="text" name="detail" class="form-control" value="${QBook.detail}" required>
</div>
<div class="form-group">
<input type="submit" class="form-control" value="修改">
</div>
<%-- <input type="submit" value="提交"/>--%>
</form>
</div>
resultado
Controlador de libro
@RequestMapping("/updateBook")
public String updateBook( Books books) {
System.out.println("updateBook=>"+books);
bookService.updateBook(books);
return "redirect:/book/allBook";
}
LibroServicioImpl
@Override
public int updateBook(Books books) {
System.out.println("BookServiceImpl:updateBook=>"+books);
return bookMapper.updateBook(books);
}
Importar paquete jar
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.4</version>
</dependency>
Agregar transacción
spring-service.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<!-- 扫描service相关的bean -->
<context:component-scan base-package="com.kuang.service" />
<!--BookServiceImpl注入到IOC容器中-->
<bean id="BookServiceImpl" class="com.kuang.service.BookServiceImpl">
<property name="bookMapper" ref="bookMapper"/>
</bean>
<!-- 配置事务管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!-- 注入数据库连接池 -->
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 结合AOP实现事务的织入 -->
<!-- 配置事务通知 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="*" propagation="REQUIRED"/>
</tx:attributes>
</tx:advice>
<!-- 配置事务切入 -->
<aop:config>
<aop:pointcut id="txPointCut" expression="execution(* com.kuang.dao.*.*(..))"/>
<aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
</aop:config>
</beans>
importación del paquete lib
updateBook.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>修改书籍信息</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- 引入 Bootstrap -->
<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
<div class="row clearfix">
<div class="col-md-12 column">
<div class="page-header">
<h1>
<small>修改书籍</small>
</h1>
</div>
</div>
</div>
<%-- 出现的问题：我们提交了修改的SQ请求，但是修改失败，初次考虑，是事务问题，配置完华事务，依旧失败！--%>
<%-- 看一下SQL语句，能否执行成功：SQL执行失败，修政未完成-%> –%>--%>
<form action="${pageContext.request.contextPath}/book/updateBook" method="post">
<input type="hidden" name="bookID" value="${QBook.bookID}">
<div class="form-group">
<label>书籍名称</label>
<input type="text" name="bookName" class="form-control" value="${QBook.bookName}" required>
</div>
<div class="form-group">
<label>书籍数量</label>
<input type="text" name="bookCounts" class="form-control" value="${QBook.bookCounts}" required>
</div>
<div class="form-group">
<label>书籍描述</label>
<input type="text" name="detail" class="form-control" value="${QBook.detail}" required>
</div>
<div class="form-group">
<input type="submit" class="form-control" value="修改">
</div>
<%-- <input type="submit" value="提交"/>--%>
</form>
</div>
Agregar manualmente el registro
mybatis-config.xml
6.11 Eliminar libros
//删除书籍
@RequestMapping("/deleteBook")
public String deleteBook(int id){
bookService.deleteBookById(id);
return "redirect:/book/allBook";
}
todoLibro.jsp
<td>
<a href="${pageContext.request.contextPath}/book/toUpdateBook?id=${book.getBookID()}">修改</a> |
<a href="${pageContext.request.contextPath}/book/del/${book.getBookID()}">删除</a>
</td>
6.12 Buscar libros
LibroMapper
Books queryBookByName(String bookName);
LibroMapper.xml
<select id="queryBookByName" resultType="Books">
select * from ssmbuild.books where bookName = #{bookName}
</select>
Servicio de libros
Books queryBookByName(String bookName);
LibroServicioImpl
@Override
public Books queryBookByName(String bookName) {
return bookMapper.queryBookByName(bookName);
}
Controlador de libro
//查询书籍
@RequestMapping("/queryBook")
public String queryBook(String queryBookName,Model model){
Books books = bookService.queryBookByName(queryBookName);
System.err.println("books=>"+books);
List<Books> list = new ArrayList<Books>();
list.add(books);
model.addAttribute("list",list);
return "allBook";
}
addBook.jsp
<div class="row">
<div class="col-md-4 column">
<a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a>
</div>
<div class="col-md-4 column">
<%-- 查询书籍--%>
<form action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float: right">
<input type="text" name="queryBookName" class="form-control" placeholder="请输入要查询书籍的名称">
<input type="submit" value="查询" class="btn btn-primary">
</form>
</div>
</div>
Resultado:
error 500 informado, no se puede encontrar dao.BookMapper.xml
, además del filtrado de recursos de Maven
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>
6.13 Mostrar todos los libros
todoLibro.jsp
<div class="row">
<div class="col-md-4 column">
<a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a>
<a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allBook">显示全部书籍</a>
</div>
<div class="col-md-8 column">
<%-- 查询书籍--%>
<form class="form-inline" action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float: right">
<span style="color:red; font-weight: bold">${error}</span>
<input type="text" name="queryBookName" class="form-control" placeholder="请输入要查询书籍的名称">
<input type="submit" value="查询" class="btn btn-primary">
</form>
</div>
</div>
Controlador de libro
//查询书籍
@RequestMapping("/queryBook")
public String queryBook(String queryBookName,Model model){
Books books = bookService.queryBookByName(queryBookName);
System.err.println("books=>"+books);
List<Books> list = new ArrayList<Books>();
list.add(books);
if (books == null){
list = bookService.queryAllBook();
model.addAttribute("error","未查到");
}
model.addAttribute("list",list);
return "allBook";
}
resultado
7. Investigación Ajax
móduloweb.xml
_
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!--1.注册servlet-->
<servlet>
<servlet-name>SpringMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--通过初始化参数指定SpringMVC配置文件的位置，进行关联-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</init-param>
<!-- 启动顺序，数字越小，启动越早 -->
<load-on-startup>1</load-on-startup>
</servlet>
<!--所有请求都会被springmvc拦截 -->
<servlet-mapping>
<servlet-name>SpringMVC</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<filter>
<filter-name>encoding</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
aplicaciónContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 自动扫描指定的包，下面所有注解类交给IOC容器管理 -->
<context:component-scan base-package="com.blue.controller"/>
<!-- 静态资源过滤 -->
<mvc:default-servlet-handler />
<mvc:annotation-driven/>
<!-- 视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
id="internalResourceViewResolver">
<!-- 前缀 -->
<property name="prefix" value="/WEB-INF/jsp/" />
<!-- 后缀 -->
<property name="suffix" value=".jsp" />
</bean>
<!-- <bean name="/t1" class="com.blue.controller.ControllerTest1"/>-->
</beans>
Controlador Ajax
package com.blue.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class AjaxController {
@RequestMapping("/t1")
public String test(){
return "hello";
}
}
Resultado:
no hay efecto de actualización en la página
test.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>iframe测试体验页面无刷新</title>
<script>
function go(){
var url = document.getElementById("url").value;
document.getElementById("iframe1").src=url;
}
</script>
</head>
<body>
<div>
<p>请输入地址：</p>
<p>
<input type="text" id="url" value="https://www.bilibili.com/">
<input type="button" value="提交" onclick="go()">
</p>
</div>
<div>
<iframe id="iframe1" style="width: 100%;height: 500px"></iframe>
</div>
</body>
</html>
Debido a que no lo usé, el blogger no terminó de leerlo. Lo siento (.・＿・.)ﾉLo siento~
8. interceptor
8.1 Verdadero y falso de los interceptores
Copia del módulo
main.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>首页</h1>
</body>
</html>
iniciar sesión.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>登录页面</h1>
<form action="${pageContext.request.contextPath}/user/login" method="post">
用户名：<input type="text" name="username"/>
密码：<input type="text" name="password"/>
<input type="submit" value="提交">
</form>
</body>
</html>
Controlador de prueba
package com.blue.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class TestController {
@GetMapping("/t1")
public String test(){
System.out.println("TestController==> test()执行了");
return "OK";
}
}
ManejadorInterceptor
package com.blue.config;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class MyInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("================处理前===============");
return true;
// return HandlerInterceptor.super.preHandle(request, response, handler);
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("================处理后===============");
// HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("================清理===============");
// HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
}
}
aplicaciónContext.xml
<!--拦截器配置-->
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**"/>
<bean class="com.blue.config.MyInterceptor"/>
</mvc:interceptor>
</mvc:interceptors>
Resultado:
el interceptor es falso
public class MyInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("================处理前===============");
return false;
// return HandlerInterceptor.super.preHandle(request, response, handler);
}
}
resultado
Página de inicio----Página de inicio de sesión,
Iniciar sesiónControlador
package com.blue.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpSession;
@Controller
@RequestMapping("/user")
public class LoginController {
//跳转到登陆页面
@RequestMapping("/jumplogin")
public String jumpLogin() throws Exception {
return "login";
}
//跳转到成功页面
@RequestMapping("/jumpSuccess")
public String jumpSuccess() throws Exception {
return "success";
}
//登陆提交
@RequestMapping("/login")
public String login(HttpSession session, String username, String pwd) throws Exception {
// 向session记录用户身份信息
System.out.println("接收前端==="+username);
session.setAttribute("user", username);
return "success";
}
//退出登陆
@RequestMapping("logout")
public String logout(HttpSession session) throws Exception {
// session 过期
session.invalidate();
return "login";
}
}
índice.jsp
<%--
Created by IntelliJ IDEA.
User: dlmu
Date: 2022/4/23
Time: 9:59
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
<h1><a href="${pageContext.request.contextPath}/goLogin"></a></h1>
<h1><a href="${pageContext.request.contextPath}/main"></a></h1>
</body>
</html>
Interceptador
Iniciar sesiónInterceptor
package com.blue.config;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
public class LoginInterceptor implements HandlerInterceptor {
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws ServletException, IOException {
// 如果是登陆页面则放行
// System.out.println("uri: " + request.getRequestURI());
if (request.getRequestURI().contains("goLogin")) {
return true;
}
HttpSession session = request.getSession();
// 如果用户已登陆也放行
if(session.getAttribute("user") != null) {
return true;
}
// 用户没有登陆跳转到登陆页面
request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request, response);
return false;
}
public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
}
public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
}
}
aplicaciónContext.xml
<!--拦截器配置-->
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**"/>
<bean class="com.blue.config.MyInterceptor"/>
</mvc:interceptor>
<mvc:interceptor>
<mvc:mapping path="/**"/>
<bean class="com.blue.config.LoginInterceptor"/>
</mvc:interceptor>
</mvc:interceptors>
Iniciar sesión en la página de inicio de sesión
Iniciar sesiónInterceptor
package com.blue.config;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
public class LoginInterceptor implements HandlerInterceptor {
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws ServletException, IOException {
// 如果是登陆页面则放行
if (request.getRequestURI().contains("goLogin")) {
return true;
}
if (request.getRequestURI().contains("login")) {
return true;
}
HttpSession session = request.getSession();
// 如果用户已登陆也放行 第一次登录，也是没有session的：
if(session.getAttribute("userLoginInfo") != null) {
return true;
}
// 用户没有登陆跳转到登陆页面
request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request, response);
return false;
}
Iniciar sesiónControlador
package com.blue.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpSession;
@Controller
@RequestMapping("/user")
public class LoginController {
@RequestMapping("/main")
public String main(){
return "main";
}
@RequestMapping("/goLogin")
public String login(){
return "login";
}
//登陆提交
@RequestMapping("/login")
public String login(HttpSession session, String username, String pwd, Model model){
// 向session记录用户身份信息
System.out.println("接收前端login==="+username);
session.setAttribute("userLoginInfo", username);
model.addAttribute("username",username);
return "main";
}
//退出登陆
@RequestMapping("/goOut")
public String logout(HttpSession session){
// session 过期
// session.invalidate();
session.removeAttribute("userLoginInfo");
return "main";
}
} 43
principal.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>首页</h1>
<span>${username}</span>
<p>
<a href="${pageContext.request.contextPath}/user/goOut">注销</a>
</p>
</body>
</html>
