67 lines
2.6 KiB
Java
67 lines
2.6 KiB
Java
package assignment1;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.Scanner;
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public class UserLogin {
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static final String DBURL = "jdbc:mysql://localhost:3306/xiaoshou?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT";
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public static void main(String[] args) {
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Scanner scanner = new Scanner(System.in);
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Connection conn = null;
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PreparedStatement pstmt = null;
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ResultSet rs = null;
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try {
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Class.forName("com.mysql.cj.jdbc.Driver");
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conn = DriverManager.getConnection(DBURL);
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int attempts = 0;
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boolean loginSuccess = false;
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while (attempts < 3 && !loginSuccess) {
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System.out.println("欢迎使用阳光超市收银系统，请登陆");
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System.out.print("请输入用户名: ");
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String username = scanner.nextLine();
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System.out.print("请输入密码: ");
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String password = scanner.nextLine();
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String sql = "SELECT xingming FROM t_yong WHERE yonghuming=? AND mima=?";
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pstmt = conn.prepareStatement(sql);
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pstmt.setString(1, username);
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pstmt.setString(2, Encrypt.MD5(password));
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rs = pstmt.executeQuery();
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if (rs.next()) {
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loginSuccess = true;
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String xingming = rs.getString("xingming");
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SimpleDateFormat formatter = new SimpleDateFormat("yyyy年MM月dd日HH时mm分ss秒");
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String currentTime = formatter.format(new Date());
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System.out.println("欢迎使用阳光超市收银系统");
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System.out.println("当前收银员：" + xingming);
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System.out.println("当前时间：" + currentTime);
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} else {
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System.out.println("用户名或密码不正确，请重新输入");
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attempts++;
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}
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}
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if (!loginSuccess)
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System.out.println("最多只能尝试3次");
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} catch (Exception e) {
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e.printStackTrace();
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} finally {
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try {
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if (rs != null)
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rs.close();
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if (pstmt != null)
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pstmt.close();
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if (conn != null)
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conn.close();
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} catch (SQLException se) {
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se.printStackTrace();
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}
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}
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}
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}
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