由于项目里面需要用到Java调用PHP的充值接口，所以学习了一下，以下这个Demo是个小小的例子，写下来做个笔记>
jsp页面：
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"
contentType="text/html; charset=GBK"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<base href="<%=basePath%>" />
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<meta http-equiv="x-ua-compatible" content="ie=7" />
<title>Lost Crown</title>
<link rel="icon" href="favicon.ico" />
<link rel="shortcut icon" href="favicon.ico" />
<script type="text/javascript">
function getXmlHttp(){
var http_request = false;
if (window.XMLHttpRequest){
http_request = new XMLHttpRequest();
if (http_request.overrideMimeType){
http_request.overrideMimeType('text/xml');
}
}else if (window.ActiveXObject){
try{
http_request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e){
try{
http_request = new ActiveXObject("Microsoft.XMLHTTP");
}catch (e) {
}
}
}
if (!http_request){
alert("不能创建对象！");
return false;
}
return http_request;
}
function result(){
if(req.readyState == 4 && req.status == 200){
var names = req.responseText;
alert("Hello:"+names);
}
}
function checkTest(){
var name = document.getElementById("name").value;
var ul = "http://localhost:8011/TestAjax/index.php?name=" + name;
req = getXmlHttp();
req.onreadystatechange = result;
req.open("POST",ul,true);
req.setRequestHeader('If-Modified-Since', '0');
req.send(null);
}
</script>
</head>
<body>
<center>
<table width="300" border=1>
<tr align="center">
<td colspan="2">
It's A Ajax Test
</td>
</tr>
<tr align="center">
<td>
用户名
</td>
<td>
<input type="text" name="name" id="name" value="Jerry"/>
</td>
</tr>
<tr align="center">
<td colspan="2">
<input type="button" name="submit" id="submit" value="提交" onclick="checkTest();"/>
</td>
</tr>
</table>
</center>
</body>
</html>
php页面：
<?php $username = $_REQUEST['name']; echo($username); ?>