廢話不多說，貼代碼，一般看到我這個文章的人，說明至少他能了解下面的代碼，是在不行的，給我留言。
JSP+JS代碼：
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE html>
<html >
<head>
<base href="<%=basePath%>" target="_blank" rel="external nofollow" >
<title>YiGou OnlineShopping Register</title>
<!-- Bootstrap -->
<link rel="stylesheet" href="Style/bootstrap.css" target="_blank" rel="external nofollow" >
<link rel="stylesheet" href="Style/bootstrap-theme.css" target="_blank" rel="external nofollow" >
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="Style/jquery-2.0.2.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="Style/bootstrap.js"></script>
<style type="text/css">
.myfont {
font-family: cursive; /*fantasy,Myriad Pro; */
font-size: 100px;
color: #0055ff;
}
</style>
<script type="text/javascript">
function check() {
var v_password = document.getElementById("inputPassword3");
var v_confirmPassword = document.getElementById("inputPassword4");
var password = v_password.value;
var confirmPassword = v_confirmPassword.value;
if (password == "") {
var show="<font color='red'>Password can't be empty!</font>";
document.getElementById("password").innerHTML=show;
v_password.focus();
return false;
}
else if (password != confirmPassword) {
var show="<font color='red'>The password is not consistent!</font>";
document.getElementById("password").innerHTML=show;
v_password.focus();
return false;
}
return true;
}
var req;
function validate(){
var userEmail=document.getElementById("inputEmail3");
var url="ajaxRegisterServlet?id="+escape(userEmail.value);
if(window.XMLHttpRequest)
{
req=new XMLHttpRequest();
}else if(window.ActiveXObject)
{
req=new ActiveXObject("Microsoft.XMLHttp");
}
req.open("GET",url,true);
req.onreadystatechange=callback;
req.send(null);
}
function callback(){
if(req.readyState==4&&req.status==200){
var check=req.responseText;
show(check);
}
}
function show(str){
if(str=="OK"){
var show="<font color='green'>The email is valid!</font>";
document.getElementById("info").innerHTML=show;
}
else if(str=="NO")
{
var show="<font color='red'>The email has been registered!</font>";
document.getElementById("info").innerHTML=show;
}
}
</script>
</head>
<body style="background:url(Images/Website/img11.jpg) repeat left top">
<div class="myfont" style="margin-top:60px;margin-left:355px;">
<span>YiGou Register</span>
</div>
<div style="margin-top:30px;margin-left:470px;width:650px">
<form class="form-horizontal" name="form" action="userServlet?method=userRegister" method="post" οnsubmit="return check()">
<div class="form-group">
<label for="inputEmail3" class="col-sm-2 control-label">Email</label>
<div class="col-sm-10">
<input type="email" class="form-control" id="inputEmail3" name="email"
style="width:300px;float:left" placeholder="Email" οnblur="validate()">
<span id="info"></span>
</div>
</div>
</form>
${Msg}
</div>
<div style="margin-top:35px;margin-left:470px">
<span style="font-size:20px;font-family:Georgia;color:black">
©Copyright 2014 By QinJiangbo All rights reserved </span>
</div>
</body>
</html>
Servlet代碼：
package com.yigou.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;
import com.yigou.service.IUserService;
import com.yigou.service.IUserServiceImpl;
public class AjaxRegisterServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
private IUserService service=new IUserServiceImpl();
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try{
response.setContentType("text/html");
response.setHeader("Cache-Control", "no-store");
response.setHeader("Pragma", "no-store");
response.setDateHeader("Expires", 0);
String userEmail=request.getParameter("id");
if(service.checkUser(userEmail))
{
out.write("OK");
}else
{
out.write("NO");
}
}finally{
out.close();
}
}
}
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