DataInputStream类

Question

我有服务器端验证码：

服务器端：

ServerSocket listenTransferSocket = new ServerSocket(6000); 
      Socket connectionTransferSocket = listenTransferSocket.accept(); 

    DataOutputStream outTransferToClient = 
     new DataOutputStream(connectionTransferSocket.getOutputStream()); 
     { 
    ....................... (Some code) 
    ....................... 
      } 
    outTransferToClient.write(fileInBytes,0,numOfBytes); 
      System.out.println("File send"); 
     **// outTransferToClient.close();** 

     BufferedReader inFromClientR = 
       new BufferedReader(new InputStreamReader(connectionTransferSocket.getInputStream())); 

客户端：

Socket fileTransferSocket = new Socket("localhost",6000); 
    DataInputStream in = new DataInputStream(new BufferedInputStream(
               fileTransferSocket.getInputStream())); 

OutputStream out = new FileOutputStream(new File("./TransferedFiles/"+fileName)); 

byte[] by = new byte[numOfBytes]; 

while ((read = in.read(by, 0, numOfBytes)) != -1) { 

     out.write(by,0,read); 
    } 

    DataOutputStream outToServerR = 
     new DataOutputStream(fileTransferSocket.getOutputStream()); 
    System.out.println("checkC"); 
     outToServerR.writeBytes("Transfer completed \n"); 

，我得到下面的异常当我尝试打开的BufferedReader如果我关闭了这个： outTransferToClient.close（）;

Exception in thread "main" java.net.SocketException: Socket is closed 
     at java.net.Socket.getInputStream(Socket.java:788) 
     at Server.main(Server.java:92) 

如果我不客户端上的while循环永远不会停止..任何帮助????

Answer 1

DataOutputStream类扩展FilterOutputStream中它具有close()方法

从docs

Closes this output stream and releases any system resources associated with the stream. 
The close method of FilterOutputStream calls its flush method, and then calls the close method of its underlying output stream. 

除此之外，它始终是一个很好的做法，对喜欢接近的方法（）在finally块

Answer 2

是，关闭DataOutputStream也关闭了底层的OutputStream。 Javadoc为DataOutputStream#close()指出：

FilterOutputStream的close方法调用其flush方法，然后调用其基础输出流的close方法。

加上，Javadoc for Socket指出，当您关闭Socket小号inputStream或outputStream，它也将关闭关联套接字。

因此，在关闭包装其任一流的DataOutputStream之后，您无法重新使用该套接字。