如何检查java中是否存在mysql用户

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

String url = "jdbc:mysql://localhost:3306/database_name";
String username = "mysql_username";
String password = "mysql_password";

try {
    Connection connection = DriverManager.getConnection(url, username, password);
    // 连接成功后的操作
} catch (SQLException e) {
    e.printStackTrace();
    // 连接失败的处理
}

String query = "SELECT User FROM mysql.user WHERE User = 'desired_username'";

try {
    Statement statement = connection.createStatement();
    ResultSet resultSet = statement.executeQuery(query);
    // 查询结果的处理
} catch (SQLException e) {
    e.printStackTrace();
    // 查询失败的处理
}

if (resultSet.next()) {
    System.out.println("MySQL用户存在");
} else {
    System.out.println("MySQL用户不存在");
}

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class CheckMySQLUser {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/database_name";
        String username = "mysql_username";
        String password = "mysql_password";

        try {
            Connection connection = DriverManager.getConnection(url, username, password);

            String query = "SELECT User FROM mysql.user WHERE User = 'desired_username'";

            Statement statement = connection.createStatement();
            ResultSet resultSet = statement.executeQuery(query);

            if (resultSet.next()) {
                System.out.println("MySQL用户存在");
            } else {
                System.out.println("MySQL用户不存在");
            }

            resultSet.close();
            statement.close();
            connection.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}