92 lines
3.7 KiB
Java
92 lines
3.7 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.util.Scanner;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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public class PasswordChange {
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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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System.out.print("请输入用户名：");
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String username = scanner.nextLine();
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String checkUserSql = "SELECT xingming FROM t_yong WHERE yonghuming=?";
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pstmt = conn.prepareStatement(checkUserSql);
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pstmt.setString(1, username);
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rs = pstmt.executeQuery();
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if (!rs.next()) {
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System.out.println("该用户不存在，请重新输入");
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return;
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}
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System.out.print("请输入当前用户的原密码：");
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String oldPassword = scanner.nextLine();
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String checkPasswordSql = "SELECT xingming FROM t_yong WHERE yonghuming=? AND mima=MD5(?)";
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pstmt = conn.prepareStatement(checkPasswordSql);
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pstmt.setString(1, username);
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pstmt.setString(2, oldPassword);
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rs = pstmt.executeQuery();
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if (!rs.next()) {
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System.out.println("原密码输入不正确，请重新输入");
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return;
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}
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String newPassword;
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while (true) {
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System.out.print("请设置新的密码：");
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newPassword = scanner.nextLine();
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if (!isPasswordComplex(newPassword))
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System.out.println("您的密码不符合复杂性要求（密码长度不少于6个字符，至少有一个小写字母，至少有一个大写字母，至少一个数字），请重新输入：");
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else
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break;
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}
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System.out.print("请输入确认密码：");
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String confirmPassword = scanner.nextLine();
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if (!newPassword.equals(confirmPassword)) {
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System.out.println("两次输入的密码必须一致，请重新输入确认密码：");
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return;
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}
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String updatePasswordSql = "UPDATE t_yong SET mima=? WHERE yonghuming=?";
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pstmt = conn.prepareStatement(updatePasswordSql);
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pstmt.setString(1, Encrypt.MD5(newPassword));
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pstmt.setString(2, username);
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int result = pstmt.executeUpdate();
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if (result > 0)
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System.out.println("您已成功修改密码，请谨记");
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else
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System.out.println("密码修改失败，请重试");
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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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public static boolean isPasswordComplex(String password) {
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if (password.length() < 6)
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return false;
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Pattern pattern = Pattern.compile("^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z]).{6,}$");
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Matcher matcher = pattern.matcher(password);
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return matcher.matches();
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}
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}
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