IDEA实现JDBC的操作步骤

package com.test.jdbc;


import com.sun.java.util.jar.pack.DriverResource;
import java.sql.*;
import java.util.ResourceBundle;
 * @ClassName : com.test.jdbc.jdbcTest04
 * @Description : 类描述
public class JdbcTest04 {
    public static void main(String[] args) {
        Connection connection = null;
        Statement statement = null;
        ResultSet  resultSet = null;
        try {
            ResourceBundle resourceBundle = ResourceBundle.getBundle("com\\test\\jdbc\\jdbc");
            //1、注册驱动
            
            String aClass = resourceBundle.getString("class");
            // 利用类的加载机制可以使完成注册驱动，因为Driver类有一个静态代码块，该代码块完成了上述的任务，可以利用反射机制，在类加载的时候执行静态代码块
            Class.forName(aClass);
            //2、建立连接
            String url = resourceBundle.getString("url");
            String user = resourceBundle.getString("user");
            String passWord = resourceBundle.getString("password");
            connection = DriverManager.getConnection(url, user, password);
            //3、获取数据库操作对象
            statement = connection.createStatement();
            //4、执行sql语句
            String sql = "select * from emp";
            resultSet = statement.executeQuery(sql);
            //5、操作结果集
            while(resultSet.next()){
                String ename = resultSet.getString("ename");
                String deptno = resultSet.getString("deptno");
                String sal = resultSet.getString("sal");
                System.out.println(ename+" " +deptno+" "+ sal);
            }
        } catch (SQLException | ClassNotFoundException e) {
            e.printStackTrace();
        }finally {
            //6、释放资源
            if(resultSet != null){
                try {
                    resultSet.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            if(statement != null){
                    statement.close();
            if(connection != null){
                    connection.close();
        }
    }
}

url = jdbc:mysql://localhost:3306/yinpan?useSSl=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true
user = root
password =
class = com.mysql.cj.jdbc.Driver