java.net.SocketException: Socket is closed

Question

InputStream input = null; try { if (socket != null) input = socket.getInputStream(); } catch (IOException e) { e.printStackTrace(); }这是代码我明明判断了socket！=null的时候才获取获取输入流，but 会报错

Answer 1

socket != null 只是避免的NullpointerException.  Socket is closed说明socket已经关闭了。

Answer 2

好难啊