54 lines
2.2 KiB
Java
54 lines
2.2 KiB
Java
package finalexam.Database;
|
|
|
|
import java.sql.Connection;
|
|
import java.sql.DriverManager;
|
|
import java.sql.PreparedStatement;
|
|
import java.sql.ResultSet;
|
|
import java.text.SimpleDateFormat;
|
|
import java.util.Date;
|
|
import java.util.Scanner;
|
|
|
|
public class UserLogin {
|
|
private static final String DBDRIVER = "com.mysql.cj.jdbc.Driver";
|
|
private static final String DBURL = "jdbc:mysql://localhost:3306/xiaoshou?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT";
|
|
|
|
public static void main(String[] args) throws Exception {
|
|
Class.forName(DBDRIVER);
|
|
Connection conn = DriverManager.getConnection(DBURL);
|
|
PreparedStatement pstmt = null;
|
|
ResultSet rs = null;
|
|
Scanner scanner = new Scanner(System.in);
|
|
int attempts = 0;
|
|
boolean loginSuccess = false;
|
|
while (attempts < 3 && !loginSuccess) {
|
|
System.out.println("欢迎使用阳光超市收银系统，请登陆");
|
|
System.out.print("请输入用户名: ");
|
|
String username = scanner.nextLine();
|
|
System.out.print("请输入密码: ");
|
|
String password = scanner.nextLine();
|
|
String sql = "SELECT xingming FROM t_yong WHERE yonghuming=? AND mima=?";
|
|
pstmt = conn.prepareStatement(sql);
|
|
pstmt.setString(1, username);
|
|
pstmt.setString(2, Encrypt.MD5(password));
|
|
rs = pstmt.executeQuery();
|
|
if (rs.next()) {
|
|
loginSuccess = true;
|
|
String xingming = rs.getString("xingming");
|
|
SimpleDateFormat formatter = new SimpleDateFormat("yyyy年MM月dd日HH时mm分ss秒");
|
|
String currentTime = formatter.format(new Date());
|
|
System.out.println("欢迎使用阳光超市收银系统");
|
|
System.out.println("当前收银员：" + xingming);
|
|
System.out.println("当前时间：" + currentTime);
|
|
} else {
|
|
System.out.println("用户名或密码不正确，请重新输入");
|
|
attempts++;
|
|
}
|
|
}
|
|
if (!loginSuccess)
|
|
System.out.println("最多只能尝试3次");
|
|
rs.close();
|
|
pstmt.close();
|
|
conn.close();
|
|
}
|
|
}
|