springMVC简单的实现代码（一）

springMVC可以实现rest风格的链接使用。非常方便

1.web.xml

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>01_spring_mvc</display-name>
  
  <!-- springMVC 1.创建servlet -->
  <servlet>
  	<!-- 需要在WEB-INF下面创建对应的hello-servlet.xml -->
  	<servlet-name>hello</servlet-name>
  	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  	<load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
  	<servlet-name>hello</servlet-name>
  	<!-- 捕获所有请求，基于rest -->
  	<url-pattern>/</url-pattern>
  </servlet-mapping>
  
  <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>
</web-app>

2.hello-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- springMVC 2.创建对应的servlet -->
<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.0.xsd">
        
    <!-- 开启SpringMVC -->
    <mvc:annotation-driven/>    
	<context:component-scan base-package="cn.edu.zttc.controller"></context:component-scan>
	
	<!-- 配置视图的前缀和后缀 -->
	<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/jsp/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
</beans>

3.hello.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>hello</title>
</head>
<body>
hello
<br>
${hello}
<br>
${string}
</body>
</html>

4.HelloController.java

package cn.edu.zttc.controller;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

/**
 * 基于@的MVC处理
 * @author admin
 *
 */
@Controller
public class HelloController {

	/**
	 * SpringMVC
	 * 设定访问规则：@RequestMapping(value={"/","/hello"})
	 * 传递参数三种方法：
	 * 1.@RequestParam("userId") int id
	 * 2.@RequestParam() int id
	 * 3.int id
	 * 如果设置了@RequestMapping；则访问的时候必须加入?和参数，否则不会访问当前方法
	 * 
	 * Struts2的
	 * 
	 * @param id
	 * @return
	 */
	@RequestMapping(value={"/","/hello"})
	public String hello(@RequestParam("userId") int id,Map<String, Object> map){
		System.out.println("hello");
		System.out.println(id);
		map.put("hello", "hello world");
		return "hello";
	}
	
	/**
	 * 使用Model
	 * @param model
	 * @return
	 */
//	public String say(@RequestParam()int id,Model model){
	@RequestMapping(value="/say")
	public String say(Model model){
		model.addAttribute("hello", "say hello world");
		//使用Object的类型作为key，string-->String
		//访问：${string}
		model.addAttribute("ok");
		return "hello";
	}
	
	/**
	 * 获取前台传递的request参数
	 * @param req
	 * @return
	 */
	@RequestMapping("/req")
	public String req(HttpServletRequest req){
		System.out.println(req.getParameter("username"));
		return "hello";
	}
}

下面附上项目结构图：

以及项目所需要的包：