Question

当套接字意外关闭时，此代码段失败。没有抛出IOException，s.read()永不返回。

  try {
   while (!doneReading)
   {    /* read blocks waiting for data */
    int readResult = s.read(inBuf, inBufLength, 1);
    ...
   }
  }
  catch (IOException err) { .. }

最初关闭套接字时，堆栈如下：

    Thread [Thread-10] (Suspended (exception SocketException))  
        SocketInputStream.socketRead0(FileDescriptor, byte[], int, int, int) line: not available [native method]    
        SocketInputStream.read(byte[], int, int, int) line: 150 
        SocketInputStream.read(byte[], int, int) line: 121  
        SocketInputStream.read(byte[]) line: 107    
        JavaSEPort$SocketImpl.readFromStream() line: 7462   
        JavaSEPort.readFromSocketStream(Object) line: 7601  
        Socket$SocketInputStream.read(byte[], int, int) line: 179   
        NetConn.runRead() line: 1044    
        NetConn.run() line: 989 
        Thread.run() line: 744  
C:\java\jdk1.8.0\bin\javaw.exe (Dec 23, 2015, 4:47:53 PM)

socketexception显然被捕获，并作为ioexception重新引发在这一点上：

    Thread [Thread-10] (Suspended (exception IOException))  
        owns: DualStackPlainSocketImpl  (id=93) 
        DualStackPlainSocketImpl(AbstractPlainSocketImpl).available() line: 465 [local variables unavailable]   
        SocketInputStream.available() line: 238 
        JavaSEPort$SocketImpl.getAvailableInput() line: 7428    
        JavaSEPort$SocketImpl.readFromStream() line: 7452   
        JavaSEPort.readFromSocketStream(Object) line: 7601  
        Socket$SocketInputStream.read(byte[], int, int) line: 179   
        NetConn.runRead() line: 1044    
        NetConn.run() line: 989 
        Thread.run() line: 744  

        NetConn.run() line: 989 
        Thread.run() line: 744

由于JavaSEPort的来源未受约束，因此很难说明发生了什么在日食环境中

更多信息：我获得了更多的源代码，并且可以看到JavaSEPort.readFromStream捕获IOException并返回null。在Socket.read中有一些更高级别，有一段时间（缓冲区== null）永远不会被转义。这完全解释了行为 - 我看到无限循环的堆栈跟踪和读取从不返回。

Answer 1

如果出现错误，您应该获得connectionError回调而不是异常。

输入套接字意外关闭时吞下IOException

1 个答案: