一个ajax的经典测试用例 (jsp)

写index.jsp文件
<%@ page contentType="text/html;charset=gb2312"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>

<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="description" content="This is my page">
<link rel="stylesheet" type="text/css" href="http://www.okajax.com/info/example/styles.css">
</head>

<body>
<script type="text/javascript">
var req;

function validate() {
var idField = document.getElementById("userid");
var url = "servlet/ValidateServlet?id=" + escape(idField.value);
if (window.XMLHttpRequest) {
alert("0");
req = new XMLHttpRequest();
}else if (window.ActiveXObject) {
alert("1");
req = new ActiveXObject("Microsoft.XMLHTTP");
}
if(req){
req.open("GET", url, true);
req.onreadystatechange = callback;
req.send(null);
}
}
function callback() {
if (req.readyState == 4) {
if (req.status == 200) {
parseMessage();
// update the HTML DOM based on whether or not message is valid
}else{
alert ("Not able to retrieve description" + req.statusText);
}
}
}
function parseMessage() {
var message = req.responseXML.getElementsByTagName("message")[0];
var name = req.responseXML.getElementsByTagName("name")[0];
setMessage(message.firstChild.data,name.firstChild.data);
}
function setMessage(message,name) {
var userMessageElement = document.getElementById("userIdMessage");
userMessageElement.innerHTML = "<font color=\"red\">" + message + " you "+name+"</font>";
}
</script>
<div id="userIdMessage"></div>
<input type="text"
size="20"
id="userid"
name="id"
onkeyup="validate();">
</body>
</html>
[2] 写servlet/ValidateServlet.java类
/*
* 创建日期 2005-8-3
*
* TODO 要更改此生成的文件的模板，请转至
* 窗口－首选项－ Java －代码样式－代码模板
*/
package com;//com包需要自己创建.

import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;

import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* @author Administrator
*
* TODO 要更改此生成的类型注释的模板，请转至
* 窗口－首选项－ Java －代码样式－代码模板
*/
public class ValidateServlet extends HttpServlet {

/**
* Constructor of the object.
*/

private ServletContext context;
private HashMap users = new HashMap();

public ValidateServlet() {
super();
}

/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}

/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client

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