<script language="JavaScript" src="../js/jquery.js"></script>
第二步：写ajax
$.ajax({
type: "POST",
url: "/test/count", //请求的servlet地址
data: "pid="+pid, //传的参数
success: function(data){ //结果
//data就是你后台返回的总记录数
alert(data)
}
})
第三步：后台
/test/count的servlet
连接数据库查询出总记录数后
response.getWriter().print(总记录数的int值)
$.ajax({type: "get",
url: "test.txt",
dataType: "text",
success: function(data) {
alert(data)
},
error: function(xhr, type) {}
})
这个是我写的。text.txt 里面是js 代码 能正确返回。 我测试过了没有问题。
jsp中用ajax获取数据的例子如下：jsp代码：
<%@ 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>
<TITLE>留学生系统</TITLE>
<META http-equiv=Content-Type content="text/htmlcharset=GBK">
<SCRIPT language=JavaScript type=text/JavaScript>
var XMLHttpReq = false
//ajax接口
function createXMLHttpRequest(){
if(window.XMLHttpRequest){
XMLHttpReq = new XMLHttpRequest()
}else if(window.ActiveXObject){
try{
XMLHttpReq = new ActiveXObject("MSXML2.XMLHTTP")
}catch(e){
try{
XMLHttpReq = new ActiveXObject("Mircsoft.XMLHTTP")
}catch(e1){}
}
}
}
function sendRequest(url){
createXMLHttpRequest()
XMLHttpReq.open("GET",url,true)
XMLHttpReq.onreadystatechange = processResponse
XMLHttpReq.send(null)
}
function processResponse(){
if(XMLHttpReq.readyState == 4){
if(XMLHttpReq.status == 200){
var res = XMLHttpReq.responseXML.getElementsByTagName("res")[0].firstChild.data
window.alert(res)
document.myform.userid.value=""
document.myform.pwd.value=""
}else{
window.alert("你请求的页面有异常1")
}
}
}
function userCheck(){
var userid = document.myform.userid.value
var pwd = document.myform.pwd.value
if(userid == ""){
window.alert("用户名不能为空")
document.myform.pwd.value=""
document.myform.userid.focus()
return false
}else{
sendRequest("login?userid="+userid)
}
}
function pwdCheck(){
var pwd = document.myform.pwd.value
var pwd2 = document.myform.pwd2.value
if(pwd!=pwd2){
window.alert("密码不一致")
document.myform.pwd.value=""
document.myform.pwd2.value=""
document.myform.pwd.focus()
return false
}
}
</SCRIPT>
<LINK href="css/css.css" type=text/css rel=stylesheet>
</HEAD>
<body>
<table width="778" border="0" align="center" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF" >
<tr>
<td width="17%"><img src="images/logo.jpg" width="124" height="101"></td>
<td width="558" height="101" background="images/banner.jpg"><div align="center">
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,29,0" width="558" height="101">
<param name="movie" value="images/2.swf">
<param name="quality" value="high">
<embed src="images/2.swf" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" width="558" height="101"></embed>
<param name="wmode" value="transparent">
</object>
</div></td>
<td width="11%"><table width="100%" border="0" cellpadding="0" cellspacing="0" >
<tr>
<td height="30" class="style1"><div align="center">设为首页</div></td>
</tr>
<tr>
<td height="30" class="style1"><div align="center">收藏本站</div></td>
</tr>
<tr>
<td height="30" class="style1"><div align="center">联系我们</div></td>
</tr>
</table></td>
</tr>
</table>
<form method="post" action="control.jsp?action=register" name="myform">
<table width="300" border="0" align="center" bgcolor="#F0F0F0">
<tr>
<td align="center">用户名</td>
<td><input name="userid" type="text" size="20" onblur="userCheck()"></td>
</tr>
<tr>
<td align="center">真实姓名</td>
<td><input name="username" type="text" size="20"/></td>
</tr>
<tr>
<td align="center">性别</td>
<td>
<input type="radio" name="sex" value="0" checked="checked">男
<input type="radio" name="sex" value="1">女
</td>
</tr>
<tr>
<td align="center">密码</td>
<td><input name="pwd" type="password" size="20"/></td>
</tr>
<tr>
<td align="center">密码确认</td>
<td><input name="pwd2" type="password" size="20" onblur="pwdCheck()"/></td>
</tr>
<tr>
<td align="center">电子邮箱</td>
<td><input name="email" type="text" size="20"/></td>
</tr>
<tr>
<td align="center">学校</td>
<td><input name="school" type="text" size="20"/></td>
</tr>
<tr>
<td align="center">电话号码</td>
<td><input name="phonenum" type="text" size="20"/></td>
</tr>
<tr>
<td align="center"><img border=0 src="image.jsp"></td>
<td><input type=text name=in maxlength=4 size="8"></td>
</tr>
<tr>
<td align="center"><input type="submit" value="确定" /></td>
</tr>
</table>
</form>
</body>
</html>
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