如何在使用 httpurlconnection 从 InputStream 读取时设置超时？

Question

我有一个 java 应用程序，我在其中使用 HttpURLConnection 下载文件。我在连接超时属性中设置了 15 秒，在读取超时属性中设置了 1 小时。据我了解，如果服务器上的文件大到需要超过 1 小时才能下载，它将因超时异常而失败。工作正常。问题是，当我在下载过程中（从 InputStream 读取缓冲区）从客户端机器上拔出 Internet 电缆时，下载过程不会立即终止，需要 1 小时（读取超时）才能中断下载。有什么办法可以终止下载过程？以下是源代码：

public class HttpDownloadUtility {
private static final int BUFFER_SIZE = 4096;
public static void downloadFile(String fileURL, String saveDir)
            throws IOException {
        URL url = new URL(fileURL);
        HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();
        httpConn.setConnectTimeout(15*1000);
        httpConn.setReadTimeout(60*60*1000);
        int responseCode = httpConn.getResponseCode();

        // always check HTTP response code first
        if (responseCode == HttpURLConnection.HTTP_OK) {
            String fileName = "";
            String disposition = httpConn.getHeaderField("Content-Disposition");
            String contentType = httpConn.getContentType();
            int contentLength = httpConn.getContentLength();

            if (disposition != null) {
                // extracts file name from header field
                int index = disposition.indexOf("filename=");
                if (index > 0) {
                    fileName = disposition.substring(index + 10,
                            disposition.length() - 1);
                }
            } else {
                // extracts file name from URL
                fileName = fileURL.substring(fileURL.lastIndexOf("/") + 1,
                        fileURL.length());
            }

            System.out.println("Content-Type = " + contentType);
            System.out.println("Content-Disposition = " + disposition);
            System.out.println("Content-Length = " + contentLength);
            System.out.println("fileName = " + fileName);

            // opens input stream from the HTTP connection
            InputStream inputStream = httpConn.getInputStream();
            String saveFilePath = saveDir + File.separator + fileName;

            // opens an output stream to save into file
            FileOutputStream outputStream = new FileOutputStream(saveFilePath);

            int bytesRead = -1;
            byte[] buffer = new byte[BUFFER_SIZE];
            while ((bytesRead = inputStream.read(buffer)) != -1) { //This is where the download gets stuck on some connection issues 
                outputStream.write(buffer, 0, bytesRead);
            }

            outputStream.close();
            inputStream.close();

            System.out.println("File downloaded");
        } else {
            System.out.println("No file to download. Server replied HTTP code: " + responseCode);
        }
        httpConn.disconnect();
    }
}

Answer 1

As per my understanding, if file on server is big enough to take more than 1 hour to download, it will fail with timeout exception.

没有。如果服务器超过一个小时未能响应任何单个读取请求，它将失败。当您调用 read() 时超时开始，并在收到对该读取的响应或超时期限到期时结束。然后它再次开始下一次阅读。总时间与它无关。你完全误会了。

Works fine.

工作正常，但与您描述的不一样。

The problem is, when I pull the Internet cable out from the client machine while download is in progress(reading buffer from InputStream), the download process does not terminates immediately, it takes 1 hour (read timeout) to break the download.

这正是它应该做的，如上所述。

Is there any way I can terminate the download process?

设置更短的超时时间。将它设置得足够长，以便服务器应在该间隔内响应，并且设置得足够短，电缆拉动不会花费太长时间超时。一个小时太长了。试试几分钟。

如何在使用 httpurlconnection 从 InputStream 读取时设置超时？

How to set a timeout while reading from InputStream using httpurlconnection?

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