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SpringMVC最简使用所需用的web.xml springmvc 
<?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>demo</display-name>

	<filter>
		<filter-name>encodingFilter</filter-name>
		<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
		<init-param>
			<param-name>encoding</param-name>
			<param-value>GBK</param-value>
		</init-param>
		<init-param>
			<param-name>forceEncoding</param-name>
			<param-value>true</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>encodingFilter</filter-name>
		<url-pattern>*.do</url-pattern>
	</filter-mapping>


	<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.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>springMVC</servlet-name>
		<url-pattern>*.do</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>
ajax简易示例 ajax_response.jsp 
<%@ page language="java" contentType="text/html; charset=gbk" pageEncoding="gbk"%>
<%
	//ajax_response.jsp充当ajax的后台使用
	String requestParam = (String)request.getParameter("text");
	System.out.println("requestParam->"+requestParam);
	out.println("后台处理后的"+requestParam);
	out.flush();
%>
ajax简易示例 ajax_request.jsp 
<%@ page language="java" contentType="text/html; charset=gbk" pageEncoding="gbk"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk">
<title>ajax_request.jsp</title>
<script type="text/javascript" src="./ref/jquery-1.7.2.js"></script>
<script type="text/javascript">
	function ajax_request(){
		var text = $("#text1").val();
		$.ajax({
			type:"POST",
			url:"ajax_response.jsp",
			data:"text="+text,
			success:function(msg){
				$("#div1").html(msg);
			}
		});
	}
</script>
</head>
<body>
这是一个ajax请求的例子<br/>
<input type="text" id="text1" name="text1" />
<input type="button" id="button1" name="button1" value="点击后返回输入的值" onclick="ajax_request()"/>
<div id="div1"></div>
</body>
</html>
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