多线程扫描udp，TCP端口java

可以使用Java的多线程和UDP/TCP协议来实现扫描UDP/TCP端口。以下是一个简单的示例代码：

import java.io.IOException;
import java.net.Socket;
import java.net.SocketException;

public class PortScanner {

    public static void main(String[] args) {
        int startPort = 1;
        int endPort = 65535;
        String ipAddress = "127.0.0.1";

        // Scan UDP ports
        for(int port = startPort; port <= endPort; port++) {
            Runnable udpScanner = new UDPPortScanner(ipAddress, port);
            Thread udpThread = new Thread(udpScanner);
            udpThread.start();
        }

        // Scan TCP ports
        for(int port = startPort; port <= endPort; port++) {
            Runnable tcpScanner = new TCPPortScanner(ipAddress, port);
            Thread tcpThread = new Thread(tcpScanner);
            tcpThread.start();
        }
    }

    static class UDPPortScanner implements Runnable {
        private String ipAddress;
        private int port;

        public UDPPortScanner(String ipAddress, int port) {
            this.ipAddress = ipAddress;
            this.port = port;
        }

        @Override
        public void run() {
            try {
                DatagramSocket socket = new DatagramSocket();
                socket.connect(ipAddress, port);
                socket.close();
                System.out.println("UDP port " + port + " is open");
            } catch (SocketException e) {
                // port is closed or an error occurred
            }
        }
    }

    static class TCPPortScanner implements Runnable {
        private String ipAddress;
        private int port;

        public TCPPortScanner(String ipAddress, int port) {
            this.ipAddress = ipAddress;
            this.port = port;
        }

        @Override
        public void run() {
            try {
                Socket socket = new Socket(ipAddress, port);
                socket.close();
                System.out.println("TCP port " + port + " is open");
            } catch (IOException e) {
                // port is closed or an error occurred
            }
        }
    }
}

该代码会启动多个线程，每个线程扫描一个UDP/TCP端口。如果端口是开放的，它将输出一条消息。请注意，该示例代码只是一个简单的示例，实际应用中可能需要更多的优化和错误处理。