SpringMVC self log 03 (SpringMVC comment)

Step one: Create a new Moudle, add web support! Establish packet structure com.kuang.controller
Step two: there may be a problem due to the Maven resource filtering, we will improve the allocation of

<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>

The third step: the introduction of relevant dependencies in pom.xml file:
Step Four: Configure web.xml

1. Note web.xml version of the problem, to the latest version!
2. Registration DispatcherServlet
3. Associated SpringMVC profile
4. Start Level 1
5. Map the path to / do not use [/ *] 404 will be
   configured 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>

Step five: Adding Spring MVC configuration file
to configure 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.kuang.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>

Step Six: Create Controller
write a Java class control: com.kuang.controller.HelloController, pay attention to coding standards

package com.kuang.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
//@Controller是为了让Spring IOC容器初始化时自动扫描到
@Controller
//@RequestMapping是为了映射请求路径，这里因为类与方法上都有映射所以访问时应该是/HelloController/hello；
@RequestMapping("/HelloController")
public class HelloController {

    //方法中声明Model类型的参数是为了把Action中的数据带到视图中；真实访问地址 : 项目名/HelloController/hello
    @RequestMapping("/hello")
    public String sayHello(Model model){
        //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,SpringMVC");
        //方法返回的结果是视图的名称hello，加上配置文件中的前后缀变成WEB-INF/jsp/hello.jsp。
        return "hello";
    }
}l

Step Seven: Create View layer
created in hello.jsp WEB-INF / jsp directory, and shows the view may be taken directly from the information back to the Controller; may represent a value, or an object taken by the EL Model stored;

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>SpringMVC</title>
</head>
<body>
    ${msg}
</body>
</html>

summary

1. Create a new web project
2. Import-related jar package
3. Write web.xml, registered DispatcherServlet
4. Write springmvc profile
5. The next step is to create the corresponding control class, controller
6. Correspondence between the controller and the last perfect front end view
7. Commissioning test run.
8. SpringMVC must be configured using the Big Three: mapper processor, processor adapter, view resolver generally, we only need to manually configure the view resolver, and the mapping processor and processor adapters only need to open the annotation-driven, and xml configuration eliminates the need for a large segment of the