问ObjectInputStream#readObject抛出java.io.EOFException

EN

Socket clientSocket = new Socket(serverIpAddr, IConstant.ServerPort);
OutputStream out = clientSocket.getOutputStream();
out.write(dataByteArray);
out.flush();
if(out!=null)
    out.close();
if(clientSocket!=null)
    clientSocket.close();

try{    
      ServerSocket serverSocket = new ServerSocket(IConstant.ServerPort);
      while(true)
      {
           Socket connectionSocket = serverSocket.accept();
           ObjectInputStream ois = new ObjectInputStream(connectionSocket.getInputStream());
           Object obj = ois.readObject();
           byte[] bytes = (byte[])obj;
           System.out.println("A notification has been received");
           //process bytes
           //...
       }
} catch(IOException ex){
     ex.printStackTrace();  
} catch (ClassNotFoundException e) {
     e.printStackTrace();
}

private byte[] serializePlayList(PlayList playList) throws IOException{
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        byte[] byteArray = null;
        ObjectOutput out = null;
        try {
          out = new ObjectOutputStream(bos);   
          out.writeObject(playList);
          out.flush();
          byteArray = bos.toByteArray();
        } finally {
          try {
            bos.close();
          } catch (IOException ex) {
          }
        }
        return byteArray;
    }