struts2框架下的一个简单的ajax例子

举个例子 jsp页面：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><base href="<%=basePath%>"><title>My JSP 'ajax.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--><script type="text/javascript" src="<%=basePath%>res/jquery-1.4.4.min.js"></script><script type="text/javascript">$(document).ready(function(){$("#button").bind("click",function(){$.ajax({type:"post",url:"<%=basePath%>ajax.action",data:"array="+$("#text").val(),datatype:"json",success:function(msg){alert(msg);},error:function(){alert("失败");}});})});</script></head><body><input id = "text" type = "text" ><input id = "button" type = "button" value ="提交"></body>
</html>

后台：

package test;import javax.servlet.http.HttpServletRequest;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.Action;public class ajax {private String str;public String ajax(){HttpServletRequest request = ServletActionContext.getRequest();str = "action处理请求后返回给ajax参数："+request.getParameter("array");System.out.println(request.getParameter("array"));return Action.SUCCESS;}public String getStr() {return str;}public void setStr(String str) {this.str = str;}}

　　Struts2 配置文件：

<?xml version="1.0" encoding="GBK"?>
<!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN""http://struts.apache.org/dtds/struts-2.1.7.dtd">
<struts><constant name="struts.i18n.encoding" value="UTF-8"/><package name="example"  extends="json-default">		<action name = "ajax" class = "test.ajax" method = "ajax"><result type = "json"><param name = "root">str</param></result></action><action name="*"><result>/WEB-INF/content/{1}.jsp</result></action></package>
</struts>

　　所用到的jar包：