一种扫描指定主机端口号Socket连接是否成功的小程序

import java.net.Socket;

public class ThreadTest implements Runnable {
    
    public static int portno = 1023;

    public synchronized void checkSocket(int port) {
        try {
            Socket socket = new Socket("10.10.10.10", port);
            System.out.println("port " + port + " is open!");
            socket.close();
        } catch (Exception e) {
            //System.err.println("port " + port + " is closed!" + "Error:"+ e.getMessage());
        }
    }

    public void run() {
        portno = portno + 1;
        checkSocket(portno);
        if (portno < 9999) {
            this.run();
        }
    }

    public static void main(String[] args) throws InterruptedException {
        for (int i = 0; i < 1000; i++) {
            new Thread(new ThreadTest()).start();
            Thread.sleep(1);
        }
    }
}

       此程序能较快的扫描出指定主机的哪些端口的Socket连接是否成功。同理，我们也可以对主机的IP地址、端口号同时扫描。