异常，以及在重置连接时如何最好重试？ [英] Exceptions, and how best to retry when a connection is reset?

问题描述

我有一些代码连接到一个URL下载一个文件，然后对其执行一些处理。但是，有时我收到错误 java.net.SocketException：Connection reset 。

I have some code which connects to a URL to download a file, and then performs some processing on it. However, sometimes I am receiving the error java.net.SocketException: Connection reset.

下载文件时我收到这个错误，说最多3次后放弃就可以了。我想知道什么是最好的结构这个方法。

I would like to retry to download the file when I receive this error, say a maximum of 3 times before giving up on it. I would like to know what would be the best way to structure this.

执行以下操作。将 try-catch 块放在和循环中似乎是可以接受的，还是有更好的方法？

Does the following look ok. Does it seem acceptable to place the try-catch block inside of a while loop, or is there a better approach?

所有帮助非常感谢！

while(!connected && retries > 0) {
  retries--;
  URL downloadUrl;
  URLConnection conn;

  try {
    downloadUrl = new URL(url);
    conn = downloadUrl.openConnection();
    conn.connect();
    connected = true;
    // Perform processing on downloaded file here

  } catch (IOException e) {
    Logger.batchLog(e);
  }
} 

推荐答案

I已经有线认为吞咽异常总是坏，但我认为这是唯一的方法来告诉连接是否确实重置。我想你正在根据你的要求处理异常，所以这是所有的事情。

I've been wired to think that swallowing an exception is always bad, but I think here, that's the only way to tell if the connection was indeed reset. I guess you are handling the exception according to your requirements, so that's all the matters.

但是，我会，让它，所以你不要吞下最后一个异常。如果它失败了三次，你会想要重新抛出该异常或以某种方式失败。

But I would, however, make it so you don't swallow the last exception. If it fails three times, you'll want to rethrow that exception or fail gracefully somehow.

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