端口

端口

端口概念

端口表示计算机上的一个程序的进程

不同的进程有不同的端口号，用来区分软件

被规定0-65535

TCP/UDP 65535*2 不同协议相同端口不冲突

端口分类：

公有端口: 0-1023

​ HTTP:80

​ HTTPS:443

​ FTP:21

​ SSH:22

​ Telent:23

程序注册端口：1024~49151，分配用户或程序

​ Tomcat:8080

​ Mysql:3306

​ Oracal:1512

动态、私有：49152~65535

# 查看端口的dos命令
netstat -ano # 查看所有的端口
netstat -ano|findstr "8080" #查看指定端口的进程
# 任务管理器快捷键 Ctrl +Shift +Esc

端口类：InetSocketAddress

package com.example.network;

import java.net.InetSocketAddress;

public class TestPort {
    public static void main(String[] args) {
        InetSocketAddress inetSocketAddress = InetSocketAddress.createUnresolved("127.0.0.1", 1234);
        InetSocketAddress inetSocketAddress1 = InetSocketAddress.createUnresolved("localhost", 1234);
        System.out.println(inetSocketAddress); // 127.0.0.1:1234
        System.out.println(inetSocketAddress1); // localhost:1234

        System.out.println(inetSocketAddress.getAddress()); // null
        System.out.println(inetSocketAddress.getHostName()); // 127.0.0.1
        System.out.println(inetSocketAddress.getPort()); // 1234

        InetSocketAddress inetSocketAddress2 = InetSocketAddress.createUnresolved("www.baidu.com", 443);
        System.out.println(inetSocketAddress2); // www.baidu.com:443
        System.out.println(inetSocketAddress2); // www.baidu.com:443

        System.out.println(inetSocketAddress2.getAddress()); // null
        System.out.println(inetSocketAddress2.getHostName()); // www.baidu.com
        System.out.println(inetSocketAddress2.getPort()); // 443
    }

}