java - Java ObjectInputStream提供了java.io.EOFException

Question

我正在尝试从服务器向客户端发送文件名列表。在我第一次运行程序时，运行良好。当它要求我退出并且我键入no时，在java.io.EOFException行给出了Object file_names = objectInput.readObject();，这可能是什么问题？
服务器

do {
   objectOutput = new ObjectOutputStream(connsock.getOutputStream());

   List<String> file_names = new ArrayList<String>();
   File[] files = new File("C:\\ServerMusicStorage").listFiles();
   for (File file : files) {
   if (file.isFile()) {
      file_names.add(file.getName());
      }
    }
   //send list to client
   objectOutput.writeObject(file_names);
   objectOutput.flush();
   exitservice = fromClient.readUTF();
   } while (exitservice != "noexit");

客户

objectInput = new ObjectInputStream(newclientSocket.getInputStream());

if (newclientSocket.isConnected()) {
            System.out.println("Connected to server...");
            boolean exit = false;
            while (exit != true) {
                System.out.println("<---Available files--->");
                // 1 get list of files from server
                Object file_names = objectInput.readObject();
                file_list = (ArrayList<String>) file_names;
                int count = 1;

                for (int i = 0; i < file_list.size(); i++) {
                    System.out.println(count + ")" + file_list.get(i));
                    count++;
                }
                System.out.println("Exit? y/n");
                String user_exit = inl.readLine();
                if (user_exit.equals("y")) {
                    exit = true;
                    toServer.writeUTF("exit");
                    System.out.println("Exiting...");

                } else {
                    exit = false;
                    toServer.writeUTF("noexit");
                }

            }
        }
        newclientSocket.close();

Answer 1

您在while条件下的测试是while (exitservice != "noexit");测试变量的指针，而不是其真实内容(这是Java的陷阱)。他们从不平等。
更改为:while (!"noexit".equals(exitservice));