ajax一个登陆的例子
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"
%>
<%
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>用户登陆</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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery-1.4.2.js"></script>
<script type="text/javascript" charset="utf-8">
function loginzp(){
var xmlHttp=false;
var username=document.zpform.username.value;
var password=document.zpform.password.value;
var url="/testajax/log/log1?username="+username+"&password="+password;
if(window.XMLHttpRequest){//Mozilla等浏览器
xmlHttp = new XMLHttpRequest();
}
else if(window.ActiveXObject){//IE浏览器
try{
xmlHttp = new ActiveXObject("Msxm12.XMLHTTP");
}catch(e){
try{
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}catch(e){
window.alert("该浏览器不支持Ajax");
}
}
}
xmlHttp.open("post",url,true);
xmlHttp.onreadystatechange = function() {
if(xmlHttp.readyState==4&&xmlHttp.status == 200){ //xmlHttp.readyState==4请求是否完成，xmlHttp.status == 200请求是否成功
//resultDiv.innerHTML = xmlHttp.responseText; //得到响应值
var str = xmlHttp.responseText.replace(/^\s*/,"").replace(/\s*$/,"");
//alert("\""+xmlHttp.responseText+"\"");
alert(str);//判断是false或是true
//alert(typeof('success'));
alert(str=="success");//输出响应信息
if(str=="success") //加上.responseText.replace(/^\s*/,"").replace(/\s*$/,"")或（replace(/^\s*|\s*$/g, '')）替换前后空格，否则也可用数字判断，而用中文或字母不行（在页面loginSuccess中设的值是success，longinFail中设置的值为0）
{
window.location.href="/testajax/log/log2";//又通过一次struts跳转到另外一个页面
}
//alert(str);
//alert(str==0);//输出响应信息
if(str==0) {
document.getElementById("s1").innerHTML = "登录名不存在！";//输出错误信息
}
}else{
document.getElementById("resultDiv").innerHTML = "正在登录，请稍后......";
}
}
//alert(url);//F12调试模式查看输出
xmlHttp.send();
}
</script>
</head>
<body>欢迎进入学生管理系统<hr/>
<form name="zpform">
用户名：<input type="text" name="username"><span id="s1"></span><br>
密码：<input type="password" name="password"><span id="s2"></span><br>
<input type="button" value="登录" onclick="loginzp()"/><!-- 此处按钮必须为为button，否则会造成表单提交，界面刷新，不是Ajax效果 -->
</form>
<div id="resultDiv"></div>
</body>
</html>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"
%>
<%
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>用户登陆</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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery-1.4.2.js"></script>
<script type="text/javascript" charset="utf-8">
function loginzp(){
var xmlHttp=false;
var username=document.zpform.username.value;
var password=document.zpform.password.value;
var url="/testajax/log/log1?username="+username+"&password="+password;
if(window.XMLHttpRequest){//Mozilla等浏览器
xmlHttp = new XMLHttpRequest();
}
else if(window.ActiveXObject){//IE浏览器
try{
xmlHttp = new ActiveXObject("Msxm12.XMLHTTP");
}catch(e){
try{
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}catch(e){
window.alert("该浏览器不支持Ajax");
}
}
}
xmlHttp.open("post",url,true);
xmlHttp.onreadystatechange = function() {
if(xmlHttp.readyState==4&&xmlHttp.status == 200){ //xmlHttp.readyState==4请求是否完成，xmlHttp.status == 200请求是否成功
//resultDiv.innerHTML = xmlHttp.responseText; //得到响应值
var str = xmlHttp.responseText.replace(/^\s*/,"").replace(/\s*$/,"");
//alert("\""+xmlHttp.responseText+"\"");
alert(str);//判断是false或是true
//alert(typeof('success'));
alert(str=="success");//输出响应信息
if(str=="success") //加上.responseText.replace(/^\s*/,"").replace(/\s*$/,"")或（replace(/^\s*|\s*$/g, '')）替换前后空格，否则也可用数字判断，而用中文或字母不行（在页面loginSuccess中设的值是success，longinFail中设置的值为0）
{
window.location.href="/testajax/log/log2";//又通过一次struts跳转到另外一个页面
}
//alert(str);
//alert(str==0);//输出响应信息
if(str==0) {
document.getElementById("s1").innerHTML = "登录名不存在！";//输出错误信息
}
}else{
document.getElementById("resultDiv").innerHTML = "正在登录，请稍后......";
}
}
//alert(url);//F12调试模式查看输出
xmlHttp.send();
}
</script>
</head>
<body>欢迎进入学生管理系统<hr/>
<form name="zpform">
用户名：<input type="text" name="username"><span id="s1"></span><br>
密码：<input type="password" name="password"><span id="s2"></span><br>
<input type="button" value="登录" onclick="loginzp()"/><!-- 此处按钮必须为为button，否则会造成表单提交，界面刷新，不是Ajax效果 -->
</form>
<div id="resultDiv"></div>
</body>
</html>