jdbc连接mysql不可写

-- 检查权限
SHOW GRANTS FOR 'username'@'host';

-- 授予权限
GRANT ALL PRIVILEGES ON database_name.* TO 'username'@'host';
FLUSH PRIVILEGES;

ping mysql_host

[mysqld]
bind-address = 0.0.0.0

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class JdbcExample {
    public static void main(String[] args) {
        String url = "jdbc:mysql://mysql_host:3306/database_name";
        String user = "username";
        String password = "password";

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            String sql = "INSERT INTO table_name (column1, column2) VALUES (?, ?)";
            try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
                pstmt.setString(1, "value1");
                pstmt.setString(2, "value2");
                pstmt.executeUpdate();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}