| 面向对象面向君，不负代码不负卿。 *^o^* |
SpringMVC HelloWorld
1.建立SpringMVC的Maven工程
1.1 使用iIntelliJ IDEA 创建Maven工程
1.2 配置pom.xml
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.ifox.hgx</groupId>
<artifactId>springMVC_1</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>springMVC_1 Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.0.3.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<finalName>springMVC_1</finalName>
</build>
</project>
2 HelloWorld实现
2.1 目录结构预览
2.2 配置web.xml
- 配置
DispatcherServlet：DispatcherServlet默认加载 /WEBINF/.xml的 Spring 配置文件, 启动 WEB 层的 Spring 容器。可以通过contextConfigLocation初始化参数自定义配置文件的位置和名称
<?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_3_1.xsd"
version="3.1">
<servlet>
<servlet-name>springDispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--配置DispatcherServlet初始化参数：springMVC配置文件的位置和参数-->
<!--也可以不通过contextConfigLocation来配置springMVC的配置文件，
而使用默认的配置文件: /WEB-INF/views/<servlet-name>-servlet.xml
即:springDispatcherServlet-servlet.xml
-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springDispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
2.3 创建 SpringMVC 配置文件: springmvc.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">
<!--配置自动扫描的包-->
<context:component-scan base-package="com.ifox"></context:component-scan>
<!--配置视图解析器:如何把handler 方法返回值解析为实际的物理视图-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
2.4 创建请求处理器类：HelloWorld .java
package com.ifox.handlers;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class HelloWorld {
/*
1.使用@RequestMapping 注解来映射请求的URL
2.返回值会通过视图解析器解析未实际的物理视图，对于InternalResourceViewResolver 视图解析器，会做如下的解析:通过prefix + returnVal + 后缀 得到实际的物理视图，然后做转发操作
如: /WEB-INF/views/success.jsp
*/
@RequestMapping("/helloworld")
public String hello(){
System.out.println("hello world");
return "success" ;
}
}
2.5 视图实现
2.5.1 index.jsp
<html>
<body>
<h2>Hello World!</h2>
<a href="helloworld">hello world</a>
</body>
</html>
2.5.2 success.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h4>success page</h4>
</body>
</html>
3 流程分析
| 大牛，别默默看了。快登陆帮我评论吧！ *^o^* |