Spring MVC的Hello World

目录结构：

Spring MVC的HelloWorld的步骤：

1、加入jar包

aopalliance-1.0.jar
aspectjweaver-1.9.0.jar
commons-logging-1.2.jar
spring-aop-4.3.8.RELEASE.jar
spring-aspects-4.3.8.RELEASE.jar
spring-beans-4.3.8.RELEASE.jar
spring-context-4.3.8.RELEASE.jar
spring-core-4.3.8.RELEASE.jar
spring-expression-4.3.8.RELEASE.jar
spring-jdbc-4.3.8.RELEASE.jar
spring-orm-4.3.8.RELEASE.jar
spring-tx-4.3.8.RELEASE.jar
spring-web-4.3.8.RELEASE.jar

spring-webmvc-4.3.8.RELEASE.jar

2、在web.xml中配置DispatcherServlet

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>Spring_MVC_01</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  
  	<!-- 配置DispatcherServlet，DispatcherServlet是前端控制器设计模式的实现，提供Spring Web MVC的集中访问点，而且负责职责的分派 -->
  	<servlet>
  		<servlet-name>springDispatcherServlet</servlet-name>
  		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  		<!-- 配置DispatcherServlet 的一个初始化参数，作用：配置SpringMVC配置文件的位置和名称 -->
  		<init-param>
  			<param-name>contextConfigLocation</param-name>
  			<param-value>classpath:springmvc.xml</param-value>
  		</init-param>
  		<load-on-startup>1</load-on-startup>
  	</servlet>
  	<!-- 配置DispatcherServlet需要拦截的url -->
  	<servlet-mapping>
  		<servlet-name>springDispatcherServlet</servlet-name>
  		<url-pattern>/</url-pattern>
  	</servlet-mapping>
  
</web-app>

3、在src目录下加入Spring MVC的配置文件

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" 
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:util="http://www.springframework.org/schema/util"
    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com.qw包及其子包下面的所有的类的注解 -->
	<context:component-scan base-package="com.qw"/>
	
	<!-- 配置视图解析器，如何把hanler 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/view/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
	
</beans>

HelloWorld.java

package com.qw.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class HelloWorld {
	
	/**
	 * @RequestMapping：映射请求来的url
	 * @return
	 */
	@RequestMapping("helloworld")
	public String hello(){
		System.out.println("hello world");
		return "success";
	}
}

index.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
	<a href="helloworld">Hello World</a>
</body>
</html>

success.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
	页面跳转成功。
</body>
</html>

在浏览器中输入：http://localhost:8080/Spring_MVC_01/index.jsp

点击Hello World，实现跳转，并且控制台打印hello world。

Spring MVC的Hello World

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