调试结构显示con为空指针这是为什么

mport java.sql.*;
import java.sql.Connection;
import java.util.ArrayList;
import java.util.Properties;

/**
 * @title: text
 * @Author
 * @Date: 2021/10/28 8:47
 * @Version 1.0
 */
public class text {
    public static void main(String[] args) throws SQLException {
            Driver driver=new com.mysql.cj.jdbc.Driver();
            String ur ="url:jdbc:mysql://localhost:3306/text001" ;
            Properties info =new Properties();
            info.setProperty("user","root");
            info.setProperty("password","123");
            Connection con=driver.connect(ur,info);
            System.out.println(con);
            String sql="select * from user";
            PreparedStatement ps=con.prepareStatement(sql);
            ResultSet resultSet=ps.executeQuery();
            ArrayList<User> list=new ArrayList<>();
            while (resultSet.next()){
                int id =resultSet.getInt("id");
                String name =resultSet.getString("name");
                int age =resultSet.getInt("age");
                User user=new User(id,name,age);
                list.add(user);
            }
            for (User user:list){
                System.out.println(user.toString());
            }
            resultSet.close();
            ps.close();
            con.close();
        }

    }

null
Exception in thread "main" java.lang.NullPointerException
at cn.jdbctext.text.main(text.java:28)

Process finished with exit code 1

String ur ="jdbc:mysql://localhost:3306/text001" ;

url换成上面的，conn空指针说明没有获取到连接。

检查你数据库服务有没有开。