【实例】ajax提交到java后台之后处理数据

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环境：eclipse+struts

要实现的效果：点击按钮提交数据到后台之后回到前台显示出来数据

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><input type="text" id="userinput"><input type="button" id="submit"><div id="msg"></div></body><script type="text/javascript" src="jquery-2.1.0.js"></script><script type="text/javascript">window.onload = function() {document.getElementById("submit").onclick = test;}function test(){var userinput = document.getElementById("userinput");$.post("http://localhost:8080/TestSpring/TestAction",{username:userinput.value},function(data, textStatus){document.getElementById("msg").innerHTML = data;}); }</script></html>

struts.xml

    <action name="TestAction" class="com.action.Test">    <result>index.jsp</result>    </action>

Test.java

package com.action;import java.io.PrintWriter;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;public class Test extends ActionSupport {@Overridepublic String execute() throws Exception {// TODO Auto-generated method stubHttpServletRequest request = org.apache.struts2.ServletActionContext.getRequest();HttpServletResponse response = ServletActionContext.getResponse();request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8");PrintWriter out = response.getWriter();out.write(request.getParameter("username"));out.flush();out.close();return SUCCESS;}}

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