怎么判定socket端口被占用

MattHgh 2008-02-26 08:50:00

java怎么判定socket端口被占用?
例如判定4567端口现在是否被站用

...全文

516 15 打赏收藏转发到动态举报

写回复

用AI写文章

15 条回复

切换为时间正序

请发表友善的回复…

发表回复

hanlujia 2008-03-04

打赏
举报

如果println("ok!");就是通的；
不然就不是通的，代码里还有停止端口的语句你可以参考到println("ok!");就可以了

hanlujia 2008-03-04

打赏
举报

import javax.swing.Timer;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

import java.net.*;

import java.io.*;

public class Test {

	Timer time = null;



	public Test() {

		time=new Timer(2000, new TimeAction());

		time.setInitialDelay(0);

		time.start();

	}



	public static void main(String[] args) throws Exception {

		

//		for(int i = 1025; i<1036;i++){

				Socket sk=new Socket("10.193.139.7",1048);

				if(sk!=null)

					System.out.println("ok!");

				BufferedReader read=new BufferedReader(new InputStreamReader(sk.getInputStream()));

				BufferedWriter writer=new BufferedWriter(new OutputStreamWriter(sk.getOutputStream()));

				System.out.println(read.readLine());

				writer.write("free"+"\n");

				writer.flush();

				System.out.println(read.readLine());

				writer.write("123"+"\n");

				writer.flush();

				System.out.println(read.readLine());

				writer.write("stop\n");

				writer.flush();

				System.out.println(read.readLine());

				read.close();

				writer.close();

				sk.close();

//		}

	}

hanlujia 2008-03-04

打赏
举报

import javax.swing.Timer;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.net.*;
import java.io.*;
public class Test {
Timer time = null;

public Test() {
time=new Timer(2000, new TimeAction());
time.setInitialDelay(0);
time.start();
}

public static void main(String[] args) throws Exception {

// for(int i = 1025; i<1036;i++){
Socket sk=new Socket("10.193.139.7",1048);
if(sk!=null)
System.out.println("ok!");
BufferedReader read=new BufferedReader(new InputStreamReader(sk.getInputStream()));
BufferedWriter writer=new BufferedWriter(new OutputStreamWriter(sk.getOutputStream()));
System.out.println(read.readLine());
writer.write("free"+"\n");
writer.flush();
System.out.println(read.readLine());
writer.write("123"+"\n");
writer.flush();
System.out.println(read.readLine());
writer.write("stop\n");
writer.flush();
System.out.println(read.readLine());
read.close();
writer.close();
sk.close();
// }
}

wuxo84 2008-02-27

打赏
举报

端口扫描



import java.io.*;

import java.net.*;

import java.util.*; 

 

public class Portsniff {

    

    public static void main(String[] args) {

        // Create application frame.

        //PortsniffFrame frame = new PortsniffFrame();

        

        // Show frame

       // frame.setVisible(true);

       String ip="127.0.0.1";

       String hostname=new String();

       try{

         InetAddress address = InetAddress.getByName(ip);

         hostname=address.getHostName();

       }

       catch(UnknownHostException e){

       System.out.println("Could not find "+ ip);

      }

      //////接下来开始嗅

     

      for(int nport=1;nport<=60;nport++)

      {

       try{

       Socket s=new Socket(hostname,nport);

       System.out.println("The port "+ nport+"is open");

             }

             catch(IOException e){

                     System.out.println("The port"+nport+" is closed");

                       }              

         } 

    }

}

奋斗并快乐着 2008-02-27

打赏
举报

serverSocket s = new serverSocket(4567);
端口被占用了会抛异常，拦截了再尝试下一个端口

MattHgh 2008-02-26

打赏
举报

在
serverSocket s = new serverSocket(4567);
之前判定下4567是不是被站用

yes152 2008-02-26

打赏
举报

java面向对象编程的一段代码

import java.io.*;

import java.net.*;

public class PortScanner {



	public static void main(String[] args) {

		Socket s = null;

		for (int port = 0; port < 1024; port++) {

			try {

				s = new Socket("localhost", port);

				System.out.println("There is a server on port " + port);

			} catch (IOException e) {

				System.out.println("Can't connect to port " + port);

			}finally {

				try {

					if(s != null) s.close();

				}catch (IOException e) {

					e.printStackTrace();

				}

			}

		}

	}



}