製做一個銀行卡用戶登陸頁面，提交後鏈接數據庫進行登陸驗證，根據驗證結果跳轉到不一樣頁面

時間 2019-12-11

標籤製做一個用戶登陸頁面提交鏈接數據庫進行驗證根據結果轉到不一樣欄目 SQL 简体版

原文原文鏈接

<%@ 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>


<form action="check.jsp" method="post"><!--action裏面寫要轉的jsp頁面  -->
卡號：<input type="text" name="cardid"><br>
密碼：<input type="password" name="password"><br>
<input type="submit" value="登錄"><br>


</form>

</body>
</html>

check.jsp ojdbc6.jar 放lib裏java

<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@page import="java.sql.PreparedStatement"%>
<%@ 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>
<!--這個頁面是
接收用戶輸入的卡號和密碼，進行驗證，驗證須要連數據庫  
request對象負責接收-->

<%
    //接收數據
    String cardid=request.getParameter("cardid");
    String password=request.getParameter("password");
    //前兩部接收數據，接受完了，就該驗證數據
    //必定要肯定數據收到了
    //數據驗證     檢查用戶名 密碼
    if(cardid==null||password==null
    ||cardid.equals("")||password.equals(""))//得保證都有數據？？？
    {
        out.write("請正確登錄系統");
    }
    else
    {
        out.write(cardid);
        out.write(password);
    }
    
    
    
    
    
    //鏈接數據庫
    Class.forName("oracle.jdbc.driver.OracleDriver");
    Connection conn=DriverManager.getConnection(
            "jdbc:oracle:thin:@localhost:1521:orcl",
            "test0816","123456");
    PreparedStatement ps=conn.prepareStatement(
            "select * from t_bankcard where cardid=?" 
                    +"and password=? and state='1'");
    ps.setString(1,cardid);
    ps.setString(2,password);
    
    ResultSet rs=ps.executeQuery();
    
    if(rs.next())
    {
        out.write("用戶名和密碼正確");
    }
    else
    {
        out.write("用戶名或密碼錯誤");
    }
    //釋放資源
    rs.close();
    ps.close();
    conn.close();
%>

</body>
</html>

<%@ 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>


<form action="check2.jsp" method="post"><!--action裏面寫要轉的jsp頁面  -->
卡號：<input type="text" name="cardid"><br>
密碼：<input type="password" name="password"><br>
<input type="submit" value="登錄"><br>


</form>

</body>
</html>

CardDAO.java 建在java Resources src 包下面sql

package com.hanqi.web;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class CardDAO {
    
    private ComboPooledDataSource cpds=new ComboPooledDataSource("helloc3p0");
    //經過配置文件構建鏈接池對象
    public boolean checkLogin(String cardid,String password)
    {
        boolean rtn=false;
        
        try {
            Connection conn=cpds.getConnection();
            
            PreparedStatement ps=conn.prepareStatement(
                    "select * from t_bankcard where cardid=?" 
                            +"and password=? and state='1'");
            ps.setString(1,cardid);
            ps.setString(2,password);
            
            ResultSet rs=ps.executeQuery();
            
            rtn=rs.next();//
            
        } catch (SQLException e) {
            // TODO 自動生成的 catch 塊
            e.printStackTrace();
        }    
        
        return rtn;
    }
    
}

check2.jsp webContent數據庫

<%@page import="com.hanqi.web.CardDAO"%>
<%@ 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>

<%
String cardid=request.getParameter("cardid");
String password=request.getParameter("password");

if(cardid==null||password==null
||cardid.equals("")||password.equals(""))
{
    out.write("請正確登錄");
}
else
{
//檢查登錄信息
CardDAO cd=new CardDAO();

if(cd.checkLogin(cardid,password))
{
    out.write("登錄成功");
}
else
{
    out.write("登錄失敗");
}
    
    
    
}

%>
</body>
</html>