一：注册页面：regist.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "https://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>
<script type="text/javascript">
function changeImg(){
document.getElementById("myImg").src='${pageContext.request.contextPath}/servlet/CheckCodeServlet?' +
new Date().getTime();
}
function validataForm(){
var username = document.getElementById("username").value;
if(username == ""){
alert("用户名不能为空！");
return false;
}
var password = document.getElementById("password").value;
if(password == ""){
alert("密码不能为空!");
return false;
}
var repassword = document.getElementById("repassword").value;
if(password != repassword){
alert("两次密码不一致！");
return false;
}
var email = document.getElementById("email").value;
if(email.match("^\s*\w+(?:\.{0,1}[\w-]+)*@[a-zA-Z0-9]+(?:[-.][a-zA-Z0-9]+)*\.[a-zA-Z]+\s*$")==null){
alert("哥们儿,邮箱地址非法");
return false;
}
}
</script>
</head>
<body>
<form action="${pageContext.request.contextPath }/servlet/RegistServlet" onsubmit="return validataForm();" method="post">
<table>
<tr>
<td>用户名：</td>
<td><input type="text" name="username" id="username"></td>
</tr>
<tr>
<td>密码：</td>
<td><input type="passoword" name="password" id="password"></td>
</tr>
<tr>
<td>确认密码：</td>
<td><input type="password" name="repassword" id="repassword"></td>
</tr>
<tr>
<td>邮箱：</td>
<td><input type="text" name="email" id="email"></td>
</tr>
<tr>
<td>验证码：</td>
<td>
<input type="text" name="checkcode">
<img src="${pageContext.request.contextPath }/servlet/CheckCodeServlet"
onclick="changeImg();" style="cursor: pointer;" id="myImg"></td>
</tr>
<tr>
<td></td>
<td><input type="submit" value="注册"></td>
</tr>
</table>
</form>
</body>
</html><%@ page language="java 
