套接字:使用Java发现端口可用性

import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.UnknownHostException;

public class CheckPortAvailability {
    public static void main(String[] args) {
        int port = 8080;
        InetAddress address = null;
        try {
            address = InetAddress.getLocalHost();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
        try {
            ServerSocket serverSocket = new ServerSocket(port, 0, address);
            serverSocket.close();
            System.out.println("端口 " + port + " 可用");
        } catch (IOException e) {
            System.out.println("端口 " + port + " 不可用");
        }
    }
}