如何用java代码实现tcp同步扫描？

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

public class TCPSyncScanner {
    public static void main(String[] args) {
        String targetHost = "目标主机IP地址";
        int startPort = 1;
        int endPort = 65535;

        for (int port = startPort; port <= endPort; port++) {
            try {
                Socket socket = new Socket(targetHost, port);
                System.out.println("端口 " + port + " 开放");
                socket.close();
            } catch (IOException e) {
                System.out.println("端口 " + port + " 关闭");
            }
        }
    }
}