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struts2.0 + ajax + xml (附源码)

程序更新：1、添加了对页面显示数据量的控制。
               2、添加了删除数据后，动态刷新表数据功能。

源码下载：  test.rar

更新文件：1、index.jsp 
               2、UserAction.java

注意事项：1、由于加包后文件太大，源码中没有struts2.0 相关jar包。
               2、该程序没有用到数据库，加入jar包后直接在web容器上运行即可。
               3、如果需要完整的源码，请留言你的邮箱，或者联系QQ：303225497。

更新代码：

           index.jsp

           
<%@ page language="java" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
    <head>
        <title>test javascript</title>
    </head>
    <script defer="defer">
    
        //XMLHTTP对象
        var xmlHttp;    
        //删除数据所在的行id   
        var deleteRowId;   
        
        /**
         * 发送请求、调用回调方法
         *
         * @param url: 请求的URL    
         *        afterMothod：请求返回时所调用的方法名称(回调方法)
         *
         */
        function showHint(url,afterMothod) {
            try{
                xmlHttp = GetXmlHttpObject(afterMothod);
                xmlHttp.open("GET",url,false);
                xmlHttp.send(null);
            }catch(e){
                alert(e);
            }
        }
        
        /**
         * 根据浏览器创建XmlHttp对象
         *
         * @param handler：请求返回时所调用的方法名称(回调方法)    
         *       
         */
        function GetXmlHttpObject(handler) {
            var objXmlHttp = null;
            if (navigator.userAgent.indexOf("Opera") >= 0) {
                alert("This example doesn't work in Opera");
                return;
            }
            if (navigator.userAgent.indexOf("MSIE") >= 0) {
                var strName = "Msxml2.XMLHTTP";
                if (navigator.appVersion.indexOf("MSIE 5.5") >= 0) {
                    strName = "Microsoft.XMLHTTP";
                }
                try {
                    objXmlHttp = new ActiveXObject(strName);
                    objXmlHttp.onreadystatechange = handler;
                    return objXmlHttp;
                }
                catch (e) {
                    alert("Error. Scripting for ActiveX might be disabled");
                    return;
                }
            }
            if (navigator.userAgent.indexOf("Mozilla") >= 0) {
                objXmlHttp = new XMLHttpRequest();
                objXmlHttp.onload = handler;
                objXmlHttp.onerror = handler;
                return objXmlHttp;
            }
        }
        
        /**
         * 请求返回是调用的回调方法
         * 服务器段返回 user 信息以xml形式发送到客户断  
         * 解析 xml 数据，把数据展现给用户
         *    
         */
        function flush() {
            try{
                if (xmlHttp.readyState == 4 || xmlHttp.readyState == "complete") {
                    
                    //得到返回过来的XML对象，进行数据处理
                    var xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
                    xmlDoc.async=false;
                    xmlDoc.loadXML(xmlHttp.responseText)  
                
                    //返回错误代码,适合用于测试。
                    //var error = xmlDoc.parseError.errorCode;
                    //alert(error?xmlDoc.parseError.reason:"XML格式正确");
                    
                    //解析XML数据，将数据刷新到userTable中
                    var users=xmlDoc.getElementsByTagName("user");
                    //插入数据前，先清空数据
                    clearTable(userTable);
                    for(var i=0;i<users.length;i++){
                        //插入行
                        var userRow=userTable.insertRow();
                        //得到行标示
                        var rowId=userRow.rowIndex;      
                        
                        //取到一个user对象
                        var user=users[i];                
                        
                        //插入序号列
                        var userNum=userRow.insertCell();
                        userNum.innerHTML = "<font size=4 color=5adf83><b>"+(i+1)+"</b></font>"; 
                        
                        //插入userid列
                        var userId=userRow.insertCell(); 
                        //显示userid  
                        userId.innerHTML = user.getAttribute("userId");
                        
                        var userName=userRow.insertCell();
                        userName.innerHTML=user.getAttribute("userName");
                        
                        var userTel=userRow.insertCell();
                        userTel.innerHTML=user.getAttribute("userTel");
                        
                        var userOp=userRow.insertCell();
                        //生成删除user的url                    
                        var deleteUserURl="user!delete.action?userNumber="+getPageUserNumber()+"&user.userId="+user.getAttribute("userId");
                        userOp.innerHTML="<a href=javascript:showHint('"+deleteUserURl+"',drop);>删除</a>";
                    }
                }
            }catch(e){
                alert(e.description);
            }
        }
        
        /**
         * 请求返回是调用的回调方法
         * 删除 user对象 服务器段返回删除后的操作信息和 user 列表数据  
         * 客户端将信息和数据展现给用户
         *    
         */
        function drop(){
            
            if (xmlHttp.readyState == 4 || xmlHttp.readyState == "complete") {
                var xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
                xmlDoc.async=false;
                xmlDoc.loadXML(xmlHttp.responseText);
                var msg=xmlDoc.getElementsByTagName("msg")[0];
                
                if(msg.getAttribute("isSuccess")=="false"){
                    alert(msg.getAttribute("msgString"));
                }else{
                    alert(msg.getAttribute("msgString"));
                    flush();//删除成功后，刷新数据。
                }
            }
        }
        
        /**
         * 清空数据表的数据 
         *
         * @param opTable：所要清空的表对象    
         *       
         */
        function clearTable(opTable){
            
            var size=opTable.rows.length;
            for(var i=2;i<size;i++){
                opTable.deleteRow(2);
            }
        }
        
        /**
         * 得到一页显示数据的个数    
         *       
         */
        function getPageUserNumber(){
            return size.value;
        }
        
        /**
         * 动态的根据用户选择的显示数进行动态返回刷新操作的URL
         *       
         */
        function getFlushUserURl(){
            return "user!list.action"+"?userNumber="+getPageUserNumber();
        }
    </script>
    <body>
        <center>
            <h3> 
                用户列表 
            </h3>
            <br>
            <table id="userTable" title="用户列表" width="60%">
                <tbody align="center">
                    <tr bgcolor="#54821f">
                        <th width="5%">
                            序号
                        </th>
                        <th width="15%">
                            用户ID
                        </th>
                        <th width="15%">
                            姓名
                        </th>
                        <th width="15%">
                            电话
                        </th>
                        <th width="5%">
                            操作
                        </th>
                    <tr>
                </tbody>
            </table>
            <br>
            <br>
            <br>
            <button onclick="showHint(getFlushUserURl(),flush);">
                刷新
            </button>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
            
            <font size="2" color="blue"><b>显示用户数：</b></font>
            <select id="size" name="userSize">
                <option value="3" selected>3</option>
                <option value="5">5</option>
                <option value="10">10</option>
                <option value="15">15</option>
                <option value="20">20</option>
            </select>
        </center>
    </body>
</html>


           UserAction.java

            
package com.wen.test;

import java.util.List;
import java.util.Random;
import java.util.Vector;


import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public class UserAction extends ActionSupport {

    private User user;

    private int userNumber;

    private List<User> userList;

    private List<String> msgList;

    public String delete() {

        String id = user.getUserId();
        msgList = new Vector<String>();

        // 当userId第5为是4的时候删除失败
        if (id.charAt(4) ==