JSP第七周作业

用户表： uid (主键，自动增长) uname upwd

使用分层实现注册。（必做）

使用分层实现登录。（选做）

index.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  </head>
  
  <body bgcolor=pink>
    <form name="form1" method="post" action="control.jsp" >
        <table>
        <tr>    
            <td>编号：</td>
                <td> <input type="text" name="uid" id="userName"  ></td>
            </tr>
            <tr>    
               <td>用户名：</td>
                <td> <input type="text" name="uname" id="userName"  ></td>
            </tr>
            <tr>    
                 <td>密码：</td>
                <td><input type="password" name="upwd" id="pwd"></td>
            </tr>
            <tr>    
                <td colspan="2"><input type="submit" value="注册">&emsp;<input type="submit" value="登录"></td>
            </tr>
        </table>
    </form>
  </body>
</html>

control.jsp

<%@page import="com.gd.dao.StuDao"%>
<%@page import="com.gd.bean.Stu"%>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
    Stu s = new Stu();
    int id = Integer.parseInt(request.getParameter("uid"));
    s.setUid(id);
    String uname = request.getParameter("uname");
    s.setUname(uname);
    String upwd = request.getParameter("upwd");
    s.setUpwd(upwd);
    
    StuDao sd=new StuDao();
    if(sd.addStu(s)>0){
        //跳转注册成功页面
    }else{
        //错误页面 
    }        
%>
<%    
    if(uname.equals("ssh")&&upwd.equals("123")){
    //跳转成功登录页面
    request.getRequestDispatcher("zccg.jsp").forward(request, response);
    session.setAttribute("uname",uname);
    }
    else{
    //错误页面
    request.getRequestDispatcher("index.jsp").forward(request, response);
    }
%>

zccg.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
    String uname = (String) request.getSession().getAttribute("uname");
%>

<html>
<head>
</head>
 
<body bgcolor=pink>
   <h1><%=uname%>登录成功！</h1>
</body>
</html>

stu.java

package com.gd.bean;

public class Stu {
    private int uid;
    private String uname;
    private String upwd;
    //访问器
    public int getUid() {
        return uid;
    }
    public void setUid(int uid) {
        this.uid = uid;
    }
    public String getUname() {
        return uname;
    }
    public void setUname(String uname) {
        this.uname = uname;
    }
    public String getUpwd() {
        return upwd;
    }
    public void setUpwd(String upwd) {
        this.upwd = upwd;
    }
    //构造器
    public Stu(int uid, String uname, String upwd) {
        super();
        this.uid = uid;
        this.uname = uname;
        this.upwd = upwd;
    }
    public Stu() {
        super();
    }
}

studao.java

package com.gd.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import com.gd.bean.Stu;

public class StuDao {

    public int addStu(Stu s){
        int i=0;
        
        try {
            //加载驱动
            Class.forName("com.mysql.jdbc.Driver");
            //建立连接
            Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/mysql?useUnicode=true&characterEncoding=utf8", "root", "root");                
            //写SQL语句
            String sql="insert into stu values(?,?,?)";            
            //执行
            PreparedStatement ps=con.prepareStatement(sql);
            ps.setInt(1, s.getUid());
            ps.setString(2, s.getUname());
            ps.setString(3, s.getUpwd());
            i=ps.executeUpdate();
                        
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return i;                
    }
    
     public int selectStu(Stu s){
            int n=0;
            try{
                Class.forName("com.mysql.jdbc.Driver");
                Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/mysql?useUnicode=true&characterEncoding=utf8", "root", "root");    
                String sql="select uname,upwd from stu where uname=?and upwd=?";    
                PreparedStatement ps=con.prepareStatement(sql);
                ps.setInt(1, s.getUid());
                ps.setString(2, s.getUname());
                ps.setString(3, s.getUpwd());
                n=ps.executeUpdate();            
            } catch (Exception e) {
                e.printStackTrace();
            }
            return n;            
        }            
}

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原文地址：https://www.cnblogs.com/komorebi-jane/p/14668429.html