问Java客户端-服务器应用程序仅在本地网络中工作

EN

    import java.io.*;
    import java.net.*;
    import java.util.Scanner;

    public class PCServer {

        public static void main(String[] args) throws IOException {

        ServerSocket server = new ServerSocket(5000);

        Socket client = server.accept();
        Scanner s = new Scanner(client.getInputStream());
        while (s.hasNextLine()) {
            System.out.println(s.nextLine());
        }

        s.close();
        server.close();
        client.close();     
        }
    }