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<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<script type="text/javascript">
function createXmlHttpRequest(){
var XMLHttp=null;
if(window.XMLHttpRequest)//支持IE7+、FF、chrome、opera、safari
{
XMLHttp=new XMLHttpRequest();//ajax核心对象
}
else//IE5、6
{
XMLHttp=new ActiveXObject('Microsoft.XMLHTTP');//ajax核心对象
}
return XMLHttp;
}
function checkUser(){
//获取ajax对象
var xhr=createXmlHttpRequest();
//设置回调函数
//xhr.onreadystatechange=callback;
//获取account文本的值
var uname=document.getElementById("username").value;
alert(uname);
//发送请求
var url="Ajax/LoginServlet?uname="+uname;
xhr.open("GET",url,true);
xhr.onreadystatechange=function(){
alert("进来了?");
if(xhr.readyState==4 && xhr.status==200){
//表示等待响应完毕
var text=xhr.responseText;
if(text=="true"){
document.getElementById("mess_error").innerHTML=text;
alert(text);
}else{
document.getElementById("mess_error").innerHTML="验证出错";
}
}
};
xhr.send(null);
}
</script>
account<input type="text" name="username" id="username"/><br/>
password<input type="password" name="password" id="password"/><br/>
<input type="button" value="登录" onclick="checkUser()"/>
<span id="mess_error"></span>
</body>
</html>
package com.tao.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginServlet extends HttpServlet{
/**
*
*/
private static final long serialVersionUID = -4018241389215773714L;
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
this.doPost(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType("text/html;charset=utf-8");
request.setCharacterEncoding("utf-8");
String oUsername=request.getParameter("uname");
PrintWriter out=response.getWriter();
out.print(oUsername);
if("ct".equals(oUsername)){
out.println("true");
}else{
out.println("false");
}
out.close();
}
}