异常，以及在连接重置时如何最好地重试?

Exceptions, and how best to retry when a connection is reset?(异常，以及在连接重置时如何最好地重试?)

问题描述

我有一些代码连接到 URL 以下载文件，然后对其执行一些处理.但是，有时我会收到错误 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.

当我收到此错误时，我想重试下载文件，最多说 3 次，然后再放弃.我想知道构建它的最佳方法是什么.

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.

以下是否正常.将 try-catch 块放在 while 循环内似乎可以接受，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?

非常感谢所有帮助！

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

我一直认为吞下异常总是不好的，但我认为，这是判断连接是否确实重置的唯一方法.我猜您正在根据您的要求处理异常，这就是所有问题.

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，我会这样做，以免您吞下最后一个例外.如果它失败了 3 次，您将需要重新抛出该异常或以某种方式优雅地失败.

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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