Posted on 2010-10-05 00:29
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刚开始学习ajax，选择了ajax和servlet的整合，初学者可参考，下面上代码。
ajax.jsp:
<%
@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>ajax测试</title>
</head>
<body>
<script type="text/javascript">
function ajaxFunction()
{
var xmlHttp;
try
{
//Fiexfox, Opera 8.0+, safari
xmlHttp = new XMLHttpRequest();
}
catch(e)
{
//ie
try
{
xmlHttp = new ActiveXObject("Msxm12.XMLHTTP");
}
catch(e)
{
try
{
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
catch(e)
{
alert("您的浏览器不支持AJAX! ");
return false;
}
}
}
xmlHttp.onreadystatechange = function()
{
if(xmlHttp.readyState == 4)
{
//document.myForm.time.value = xmlHttp.responseText;
var text = xmlHttp.responseText;
var strings = text.split(",");
var name = strings[0];
var number = strings[1];
document.myForm.name.value = name;
document.myForm.time.value = number;
setTimeout("load()", 1000);
}
}
xmlHttp.open("GET","servlet/getInfo",true);
xmlHttp.send(null);
}
</script>
<form name="myForm">
<table align="center">
<tr><td colspan="2"><input type="text" onblur="ajaxFunction();" value="从本文本框失去焦点则触发ajax" size="30" style="color:red;"/> </td></tr>
<tr>
<td>名称: </td>
<td><input type="text" name="name" /></td>
</tr>
<tr>
<td>数量: </td>
<td><input type="text" name="time" /></td>
</tr>
</table>
</form>
</body>
</html>
GetInfo.java(servlet):
1package servlet;
2
3import java.io.IOException;
4import java.util.Random;
5
6import javax.servlet.ServletException;
7import javax.servlet.http.HttpServlet;
8import javax.servlet.http.HttpServletRequest;
9import javax.servlet.http.HttpServletResponse;
10
11public class GetInfo extends HttpServlet
12{
13 @Override
14 public void doGet(HttpServletRequest req, HttpServletResponse resp)
15 throws ServletException, IOException
16 {
17 resp.setContentType("text/xml;charset=utf-8");
18 resp.setCharacterEncoding("utf-8");
19 resp.setHeader("Cache-Control", "no-cache");
20 String name[] = {"java程序设计","数据库基础","软件工程"};
21
22 String str = name[new Random().nextInt(name.length)] + "," + new Random().nextInt(1000);
23 System.out.println("字符串: " + str);
24
25 resp.getWriter().write(str);
26 resp.getWriter().flush();
27 }
28
29 @Override
30 public void doPost(HttpServletRequest req, HttpServletResponse resp)
31 throws ServletException, IOException
32 {
33 // TODO Auto-generated method stub
34 doGet(req, resp);
35 }
36}
37
web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<servlet-name>getInfo</servlet-name>
<servlet-class>servlet.GetInfo</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>getInfo</servlet-name>
<url-pattern>/servlet/getInfo</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
运行结果截图：
