JnhgAHVH

1import java.sql.*;
2
3public class LoginService {
4    private static final String DB_URL = "jdbc:mysql://localhost:3306/users?user=root&password=secret123";
5
6    public boolean authenticate(String username, String password) {
7        Connection conn = null;
8        Statement stmt = null;
9        ResultSet rs = null;
10        
11        try {
12            conn = DriverManager.getConnection(DB_URL);
13            stmt = conn.createStatement();
14            String query = "SELECT * FROM users WHERE username = '" + username + 
15                          "' AND password = '" + password + "'";
16            rs = stmt.executeQuery(query);
17            
18            if (rs.next()) {
19                return true;
20            }
21        } catch (SQLException e) {
22            e.printStackTrace();
23        } finally {
24            try {
25                if (rs != null) rs.close();
26                if (stmt != null) stmt.close();
27                if (conn != null) conn.close();
28            } catch (SQLException e) {
29                e.printStackTrace();
30            }
31        }
32        return false;
33    }
34
35    public static void main(String[] args) {
36        LoginService service = new LoginService();
37        boolean result = service.authenticate(args[0], args[1]);
38        System.out.println("Authentication " + (result ? "successful" : "failed"));
39    }
40}