网络编程（一）

网络学习

ip

ip地址：IntAddress

ip地址的分类

ipv4/ipv6

• ipv4 127.0.0.1,4个字节组成
• ipv6 , 128位，8个无符号整数

IP查询：终端+ipconfig

//查询本机地址
InetAddress inetAddress1 = InetAddress.getByName("127.0.0.1");
            System.out.println(inetAddress1);
            InetAddress inetAddress3 = InetAddress.getByName("localhost");
            System.out.println(inetAddress3);
            InetAddress inetAddress4 = InetAddress.getLocalHost();
            System.out.println(inetAddress4);
//查询网站地址
 InetAddress inetAddress2 = InetAddress.getByName("www.baidu.com");
            System.out.println(inetAddress2);

端口

端口分类

1. 公有端口：0~1023

   HTTP:80

   HTTPS:443

   FTP:21

   Telent:23

2. 程序注册端口：1024~49151（分配用户或者程序）

   Tomcat:8080

   MySQL:3306

   Oracle:1521

3. 动态、私有：49152~65535

netstat -ano//查看所有端口
netstat -ano|findstr "5353"//查看指定端口
tasklist|findstr "17072"//查看指定进程
Ctrl+shift+Esc //打开任务管理器

import java.net.InetSocketAddress;

public class Socket {
    public static void main(String[] args) {
        //InetSocketAddress可以使用new
        InetSocketAddress socketAddress=new InetSocketAddress("127.0.0.1",8080);
        InetSocketAddress socketAddress1=new InetSocketAddress("localhost",8080);
        System.out.println(socketAddress);
        System.out.println(socketAddress1);
    }
}