网络编程Port-InetSocketAddress

网络编程Port-InetSocketAddress

端口有0-65535

tcp和udp所占端口可以相同，各走一套

公用端口：0-1023 别用

• http 80

• https 443

• ftp 21

• Telent 23

程序注册端口：1024-49151

• Tomcat 8080

• MySQL 3306

• Oracle 1521

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1. cmd中查看所有进程

   netstat -ano

2. cmd中查看某个端口号所占的进程

   netstat -ano|findstr"端口号"

3. cmd中查看某个端口号所占的事务

   tasklist|findstr "端口号"

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import java.net.InetSocketAddress;
​
public class TestPort {
    public static void main(String[] args) {
        InetSocketAddress socketAddress =new InetSocketAddress("localhost",8080);
        System.out.println(socketAddress);//localhost/本机ip地址:8080
​
        System.out.println(socketAddress.getAddress());//localhost/本机ip地址
        System.out.println(socketAddress.getHostName());//localhost
        System.out.println(socketAddress.getHostString());//localhost
        System.out.println(socketAddress.getPort());//8080
    }
}