struts2 ajax jquery返回json类型

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三个页面，

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"><struts>    <package name="default" namespace="/" extends="json-default">        <action name="checkuser" class="checkuserAction">            <result name="success" type="json">                <param name="root">result</param>            </result>        </action>    </package></struts>

import java.util.HashMap;import java.util.Map;import net.sf.json.JSONObject;import com.opensymphony.xwork2.ActionSupport;public class checkuserAction extends ActionSupport {    private String username;    private JSONObject obj;    private String result;    /**     * @return     */    public String execute() {        String msg = "";        if (username.equals("admin")) {            msg="已经注册啦，不行";        }        else {            msg="可以注册，放心";        }        Map<String,String>  map = new HashMap<String,String>();        map.put("msg", msg);        obj=JSONObject.fromObject(map);        result=obj.toString();        return SUCCESS;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public JSONObject getObj() {        return obj;    }    public void setObj(JSONObject obj) {        this.obj = obj;    }    public String getResult() {        return result;    }    public void setResult(String result) {        this.result = result;    }}

<%@ 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 'index.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="jquery-2.1.4.js"></script><script type="text/javascript">    $(document).ready(function() {        $("#username").bind("blur", function() {            var username = $("#username").val();            $.ajax({                type : "post",                url : "checkuser",                dataType : "json",                data : {                    'username' : username                },                success : function(data) {                    var d = eval("(" + data + ")");//将数据转换成json类型，可以把data用alert()输出出来看看到底是什么样的结构                    //得到的d是一个形如{"key":"value","key1":"value1"}的数据类型，然后取值出来                    $("#msg").text("" + d.msg + "");                }            });        });    });</script></head><body>    <input type="text" name="username" id="username">    <div id="msg"></div></body></html>

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