jsp登记页面代码 待改写

jsp注册页面代码 待改写
jsp注册页面代码  
网上抄下来的，想用在自己的项目里面，改动了不少，越来越感觉程序写的复杂，视图和控制，还有数据库混在一起，错误处理代码写的很烂.....

用户信息的bean： UserBean.java

package chen;
public class UserBean
{
 private String userid;
 private String password;
 public void setUserId(String userid)
 {
 this.userid=userid;
 }
 public void setPassword(String password)
 {
 this.password=password;
 }
 public String getUserId()
 {
 return this.userid;
 }
 public String getPassword()
 {
 return this.password;
 }
}

提交数据库的bean：UserRegister.java

package chen;
import com.mysql.jdbc.Driver;
import java.sql.*;
public class UserRegister
{
 private UserBean userBean;
 private Connection con;
 //获得数据库连接。
 public UserRegister()
 {
 String url="jdbc:mysql://localhost/"+"chao"+"?user="+"root"+"&password="+"850629";
 try
 {
 Class.forName("com.mysql.jdbc.Driver").newInstance();
 con = DriverManager.getConnection(url);
 }
 catch(Exception e)
 {
 e.printStackTrace();
 }
 }
 //设置待注册的用户信息。
 public void setUserBean(UserBean userBean)
 {
 this.userBean=userBean;
 }
 //进行注册
 public void regist() throws Exception
 {
 String reg="insert into userinfo(userid,password) values(?,?)";
 try
 {
 PreparedStatement pstmt=con.prepareStatement(reg);
 pstmt.setString(1,userBean.getUserId());
 pstmt.setString(2,userBean.getPassword());
 pstmt.executeUpdate();
 }
 catch(Exception e)
 {
 e.printStackTrace();
 throw e;
 }

 }
}

提交注册数据进入数据库：adduser.jsp

<%@ page contentType="text/html;charset=gb2312" pageEncoding="gb2312"
import="chen.*" %>
<jsp:useBean id="userBean" class="chen.UserBean" scope="request">
<jsp:setProperty name="userBean" property="*"/>
</jsp:useBean>
<jsp:useBean id="regist" class="chen.UserRegister" scope="request"/>
<html>
<head>
<title> 用户信息注册页面</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
<%
String userid =request.getParameter("userid");
String password = request.getParameter("password");
userBean.setUserId(userid);
userBean.setPassword(password);
System.out.println(userid+password);
%>
<% try{
 regist.setUserBean(userBean);
 out.println(userid);
 regist.regist();
 out.println("注册成功");}
 catch(Exception e){
 out.println(e.getMessage());
 }
%>
<br>
<a href="login.jsp">返回</a>
</body>
</html>

登陆验证页面：checklogin.jsp

<%@page import="java.sql.*" contentType="text/html;charset=GB2312" %>
<%@page import="java.util.*"%>
<%
 String userid1=new String(request.getParameter("userid"));
 String password1=new String(request.getParameter("password"));
Class.forName("com.mysql.jdbc.Driver");
Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/chao","root","850629");
Statement stmt=con.createStatement();
String sql="select * from userinfo where userid='"+userid1+"';";
ResultSet rs=stmt.executeQuery(sql);
 if(rs.next())
 {String password=new String(rs.getString("password"));
 if(password.equals(password1))
 {session.setAttribute("userid1",userid1);
 response.sendRedirect("sucess.jsp");
 }
 else
{response.sendRedirect("login.jsp");
}
}
else
{response.sendRedirect("login.jsp");
}
%>

登陆页面：login.jsp

<%@ page contentType="text/html; charset=gb2312" %>
<html>
<body>
<form method="get" action="checklogin.jsp">
<table>
<tr><td> 输入用户名：</td>
<td><input type=text name=userid ></td>
</tr>
<tr><td>输入密码：</td>
<td><input type=password name=password></td>
</tr>
<tr><td><input type=submit value=确认>
</td></tr>
</table>
</form>
<form action="register.jsp">
<input type=submit value=注册>
</form>
</body>
</html>

注册页面：register.jsp

<%@page contentType="text/html; charset=gb2312" language="java" import="java.util.*,java.io.*"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
<center>
 <h1>注册新用户</h1>
 <form action="adduser.jsp" method=post>
 <table border="1" bgcolor="#0099CC">
 <tr>
 <td> 用户名:
 <input type="text" name="userid">
 </td>
 </tr>
 <tr valign="middle">
 <td> 密码：
 <input type="password" name="password" readonly>
 </td>
 </tr>
 <tr>
 <td>
 <input type=submit value=提交>
 </td>
 </tr>
 </table>
 </form>
</center>
</body>
</html>

登陆成功页面：sucess.jsp

<%@page import="java.util.*" contentType="text/html; charset=gb2312" %>
<%@include file="trans.jsp"%>
<html>
<head>
<title>
sucess
</title>
</head>
<body bgcolor="#ffffff">
<h1>
登录成功，欢迎您！
</h1><%=trans(session.getAttribute("userid1"))%>
</body>
</html>