如何让Java套接字使用公共IP？

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

public class PublicIPServer {
    public static void main(String[] args) {
        try {
            // 获取公共IP地址
            InetAddress publicIPAddress = InetAddress.getLocalHost();

            // 创建ServerSocket对象，并将其绑定到公共IP地址和端口
            ServerSocket serverSocket = new ServerSocket(8080, 50, publicIPAddress);

            System.out.println("服务器已启动，监听公共IP地址：" + publicIPAddress.getHostAddress() + "，端口：8080");

            // 接受客户端连接
            while (true) {
                // do something
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}