Java Socket 测试本机使用的端口

import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

public class sampletest 
{
    public static void main(String[] args)
    {
    for(int i=1;i<256;i++)
    {
       try
       {
        InetAddress localHost=InetAddress.getLocalHost();
        Socket socket=new Socket(localHost,i);
        System.out.println("本机已经使用了端口："+i);
       }
       catch(UnknownHostException e)
       {
        //e.printStackTrace();
       }
       catch(IOException e)
       {
       // e.printStackTrace();
       }
    }
    System.out.println("执行完毕！");
    }
}

 

import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

public class sampletest implements Runnable
{
	public sampletest(){
		
	}
	public void searchPort(){
		System.out.println("本机已经使用了端口：");
		for(int i=1;i<256;i++)
	    {
	       try
	       {
	        InetAddress localHost=InetAddress.getLocalHost();
	        Socket socket=new Socket(localHost,i);
	        System.out.print("  "+i+":使用");
	       }
	       catch(UnknownHostException e)
	       {
	        //e.printStackTrace();
	       }
	       catch(IOException e)
	       {
	    	   System.out.print("  "+i+":空闲");
	       // e.printStackTrace();
	       }
	    }
	    System.out.println("执行完毕！");
	    
	}
	public void run() {
		for(;;){
			try {
				Thread.sleep(3000);
				this.searchPort();
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		// TODO Auto-generated method stub
		
	}
	public static void main(String[] args){
		 Runnable rb = new sampletest();
		 new Thread(rb).start();
	}  
}