ajax原

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<%@ 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 'ajax.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">


<script type="text/javascript">

var xmlHttpRequest = null; //声明一个空对象以接收XMLHttpRequest对象

function ajaxSubmit()
{
if(window.ActiveXObject) // IE浏览器
{
xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
}
else if(window.XMLHttpRequest) //除IE外的其他浏览器实现
{
xmlHttpRequest = new XMLHttpRequest();
}

if(null != xmlHttpRequest)
{
var v1 = document.getElementById("value1ID").value;
var v2 = document.getElementById("value2ID").value;

xmlHttpRequest.open("POST", "AjaxServlet", true);
//关联好ajax的回调函数
xmlHttpRequest.onreadystatechange = ajaxCallback;

//真正向服务器端发送数据
// 使用post方式提交，必须要加上如下一行
xmlHttpRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xmlHttpRequest.send("v1=" + v1 + "&v2=" + v2);
}
}

function ajaxCallback()
{
if(xmlHttpRequest.readyState == 4)
{
if(xmlHttpRequest.status == 200)
{
var responseText = xmlHttpRequest.responseText;

document.getElementById("div1").innerHTML = responseText;
}
}
}

</script>

</head>

<body>

<input type="button" value="get content from server" onclick="ajaxSubmit();"><br>
<input type="text" name="value1" id="value1ID"><br>
<input type="text" name="value2" id="value2ID"><br>

<div id="div1"></div>

</body>
</html>