Java链接mysql

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

public class Dbcon {
    //mysql8.0 url confing serverTimezone
    //配置jdbc的URL：jdbc:mysql://[IP]:[PORT]/[DB]?characterEncoding=utf8&useSSL=false&serverTimezone=UTC&rewriteBatchedStatements=true
    private static String URL = "jdbc:mysql://localhost:3306/dlt?serverTimezone=UTC";
    private static String USER = "root";
    private static String PASSWORD = "Ychina.9";
    private static Connection con = null;
    
    public Dbcon(){}
    
    public static void main(String[] args) throws Exception {
        //mysql-connector-java-8.0.20
        Class.forName("com.mysql.cj.jdbc.Driver");
        con = DriverManager.getConnection(URL, USER,PASSWORD);
        Statement stmt = con.createStatement();
        ResultSet rs = stmt.executeQuery("select q1,q2,q3,q4,q5,h1,h2 from detail where id = '7001'");
        while(rs.next()){
            System.out.println("Q1:" + rs.getString(1));
            System.out.println("Q2:" + rs.getString(2));
            System.out.println("Q3:" + rs.getString(3));
            System.out.println("Q4:" + rs.getString(4));
            System.out.println("Q5:" + rs.getString(5));
            System.out.println("H1:" + rs.getString("h1"));
            System.out.println("H2:" + rs.getString("h2"));
        }
    }
}