Question

我正在使用tcp套接字的文件传输应用程序。在正常情况下，当我尝试使用应用程序发送文件时，会收到完整的文件，但是当我在收到的每个数据包之间放置40毫秒的睡眠时，我只收到部分文件。我也在将完整文件发送到输出流后立即关闭套接字。可能是我没有收到完整文件的可能原因？以下是发送方和接收方的代码。提前谢谢。

/////////////////////////Sender Side////////////////////////////

bytesLeft = fileSize;
while(bytesLeft > 0) 
{
    try 
    {
        bytesRead = fileInpStream.read(buffer, 0, BUFFERSIZE);
        outStream.write(Arrays.copyOfRange(buffer, 0, bytesRead));
    } 
    catch (IOException e) 
    {
        try 
        {
             fileInpStream.close();
        } 
        catch (IOException e1) 
        {
            Log.i(LOGC, "Error " + e1.getMessage());
            e1.printStackTrace();
            disconnect();
            return;
        }
    }
    bytesLeft -= bytesRead;
    if (bytesLeft < 1) 
    {
      try 
      {
        fileInpStream.close();
      } 
      catch (IOException e) 
      {
        e.printStackTrace();
      }
    }
}
//Closing the socket immediately after all the data are sent to out stream.
try 
{
    socket.close();
} 
catch (StcException e) 
{
    e.printStackTrace();
}


/////////////////Receiver Side//////////////////////////

bytesLeft = filesize;
while (bytesLeft > 0) 
{
    try 
    {
      if (bytesLeft < BUFFERSIZE)
        readAmount = (int) bytesLeft;
      bytesRead = inpstream.read(buf, 0, readAmount);
      if (bytesRead < 1) 
      {
        fileoutputstream.close();
      }
      fileoutputstream.write(Arrays.copyOfRange(buf, 0,bytesRead));
      bytesLeft -= bytesRead;

      //Including a sleep of 40 ms or more doesnt completely receive the data.
      //try{ sleep(40) } catch(Exception e){ }

      if (bytesLeft == 0) 
      {
        fileoutputstream.close();
      }
    } 
    catch (IOException e) 
    {
      try 
      {
        fileoutputstream.close();
      } 
      catch (IOException e1) 
      {
        e1.printStackTrace();
      }
    } 
}

Answer 1

你首先不需要睡觉。把它拿出来。这只是浪费时间。你的代码是它需要的复杂几倍，并且可能掩盖了一些潜伏的错误。这样：

while ((count = in.read(buffer)) > 0)
{
    out.write(buffer, 0, count);
}
out.close();

两端都足够了。

接收器端引入睡眠时，接收器端未完全接收到数据

1 个答案: