Java Example - Check if a port is in use

The following example demonstrates how to detect whether the port has been used:

/*
 author by w3cschool.cc
 Main.java
 */import java.net.*;import java.io.*;public class Main {
   public static void main(String[] args) {
      Socket Skt;
      String host = "localhost";
      if (args.length > 0) {
         host = args[0];
      }
      for (int i = 0; i < 1024; i++) {
         try {
            System.out.println("查看 "+ i);
            Skt = new Socket(host, i);
            System.out.println("端口 " + i + " 已被使用");
         }
         catch (UnknownHostException e) {
            System.out.println("Exception occured"+ e);
            break;
         }
         catch (IOException e) {
         }
      }
   }}

The output result of the above code is:

……
查看 17
查看 18
查看 19
查看 20
查看 21
端口 21 
已被使用
查看 22
查看 23
查看 24
……

The above is the Java example - check whether the port has been used , for more related content, please pay attention to the PHP Chinese website (www.php.cn)!