如何连接JDBC ？

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
//虽然是使用的JDBC 但这在里引用的都是sql下的。
public class JDBC {
    
    public static void main(String[] args) {
        Statement stat = null ;
        Connection conn=null;
        ResultSet resultSet= null;
        
        //1.加载JDBC驱动
        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //2、建立数据库连接
        
        try {
            conn=   DriverManager.getConnection("jdbc:mysql://localhost:3308/shxt","root","mysql");
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    
        //3、用数据库连接生成语句对象
        try {
             stat= conn.createStatement();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //4、用语句对象执行sql
        String sqlInsert = "insert into student(sid,sname,age)values(32,'小龙龙',22)";
        String sqlSelect ="select sid,sname,age from student";
        int a=0;
        
        try {
            resultSet= stat.executeQuery(sqlSelect);
            
        } catch (SQLException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        /*try {
            int a =stat.executeUpdate(sqlInsert);
            if(a >0){
                System.out.println("修改成功！");
            }else {
                System.out.println("修改失败！");
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
         */
        try {
            while(resultSet.next())
            {
                String  sid =  resultSet.getString("sid");
                String sname = resultSet.getString("sname");
                String  age =  resultSet.getString("age");
                System.out.println(sid+"	"+sname+"	"+age);
            }
        } catch (SQLException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        //5、释放资源（数据库连接）
        try {
            conn.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

}
}