发送EOFException时ObjectOutputStream

Question

我试图向运行在端口80上的服务器发送一个空白的TCP数据包，但是当服务器响应时，它会给我一个EOFException。

java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2624) at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:3099) at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:853) at java.io.ObjectInputStream.(ObjectInputStream.java:349) at me.adamstephenson.test.main.main(main.java:106)

ArrayList<String> results = getIPs();

    for (String ip : results){
        System.out.println(ip);

        String pingip = ip;
        pingip = pingip.replaceAll("[^\\d.]", "");
        System.out.println(pingip);

        Socket socket = null;
        ObjectOutputStream oos = null;
        ObjectInputStream ois = null;
        try {
            socket = new Socket(pingip, 80);
            oos = new ObjectOutputStream(socket.getOutputStream());

            ois = new ObjectInputStream(socket.getInputStream());  // error here

            String msg = "blank";
            oos.write(msg.getBytes());
            oos.flush();

            //read the server response message
            String message = (String) ois.readObject();

            System.out.println(message);

            ois.close();
            oos.close();
            socket.close();
        } catch (ConnectException | EOFException e) {
            System.out.println("Failed to connect to: "+pingip);
            e.printStackTrace();
        }


    }

EOFException是否意味着响应是空白的？

Answer 1

这意味着服务器在关闭套接字之前甚至没有创建ObjectOutputStream。可能您发送了一些它不理解的东西，也许它使用的应用程序协议根本不涉及序列化。

毕竟，端口80是为HTTP保留的。