struts2+jquery+json集成

package com.ljq.bean;

import java.io.Serializable;

@SuppressWarnings("serial")
public class User implements Serializable {
    private int id;
    private String username;
    private String pwd;

    public User() {
    }

    public User(int id, String username, String pwd) {
        super();
        this.id = id;
        this.username = username;
        this.pwd = pwd;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

}

package com.ljq.action;

import net.sf.json.JSONObject;

import com.ljq.bean.User;
import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public class JsonAction extends ActionSupport{
    private User user;
    // 返回结果给客户端
    private String result;
    
    @Override
    public String execute() throws Exception {
        //将要返回的实体对象进行json处理
        JSONObject json=JSONObject.fromObject(user);
        //输出格式如：{"id":1, "username":"zhangsan", "pwd":"123"}
        System.out.println(json);
        result=json.toString();
        return SUCCESS;
    }

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    public String getResult() {
        return result;
    }

    public void setResult(String result) {
        this.result = result;
    }

}

xml version="1.0" encoding="UTF-8" ?>
DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
struts>
    
    constant name="struts.action.extension" value="do" />
    
    constant name="struts.serve.static.browserCache" value="false" />
    
    constant name="struts.configuration.xml.reload" value="true" />
    
    constant name="struts.devMode" value="true" />
    
    
    
    
    
    package name="test" extends="json-default">
        action name="jsonAction" class="com.ljq.action.JsonAction">
            result type="json">
                
                param name="root">resultparam>
            result>
        action>
    package>


struts>

@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
@taglib uri="/struts-tags" prefix="s"%>

    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="">

        title>My JSP ‘index.jsp‘ starting pagetitle>
        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">
        script type="text/javascript" src="/js/jquery-1.3.1.js">script> 
        script type="text/javascript" src="/js/index.js">script>
        
        
        
    head>

    body>
        
        div id="result">div>
        s:form name="userForm" action="/jsonAction.do" method="post">
            编号：input name="user.id"/>br/>
            用户名：input name="user.username"/>br/>
            密码：input name="user.pwd"/>br/>br/>
            input id="btn" type="button" value=" 提 交 "/>
        s:form>

    body>
html>

$(document).ready(function(){
    //点击提交按钮时，从服务端获取数据，然后在客户端显示
    $("#btn").click(function(){
        // 序列化表单的值
        var params=$("input").serialize();
        $.ajax({
            url: "jsonAction.do",
            // 数据发送方式
            type: "post",
            // 接受数据格式
            dataType : "json",
            // 要传递的数据
            data : params,
            // 回调函数，接受服务器端返回给客户端的值，即result值
            success : show   
        });
    });
});
 
function show(result){
    //测试result是否从服务器端返回给客户端
    //alert(result);
    //解析json对象
    var json = eval("("+result+")");
    var obj = "编号: "+json.id+"  用户名: "+json.username+"  密码: "+json.pwd;
    $("#result").html(obj);
}