問題描述
我正在嘗試使用 Apache Commons Net 進行 FTP 文件傳輸.
I'm trying to use Apache Commons Net for FTP file transfers.
問題是文件間歇性地到達服務器損壞.損壞"是指 WinRAR 告訴我一個 ZIP 文件有一個 意外結束存檔".有時文件完全是空的.我注意到大文件 (100kb+) 會發生這種情況，但小文件 (20kb) 也會發生這種情況.
Problem is files are intermittently arriving at the server corrupt. By 'corrupt' I mean that WinRAR tells me a ZIP file has an 'Unexpected end of archive'. Sometimes the files are completely empty. I have noticed that this happens more for larger files (100kb+), however does happen for small files too (20kb).
我知道上傳的源 zip 文件是有效的，并且只有 243kb.
I know for a fact that the source zip file being uploaded is valid, and is only 243kb.
我沒有從代碼中得到任何錯誤/異常.
I do not get any errors/exceptions from the code.
這是正在執行的代碼:
int CON_TIMEOUT = (int) TimeUnit.SECONDS.toMillis(20); // fail if can't connect within 20 seconds
int LIVE_TIMEOUT = (int) TimeUnit.MINUTES.toMillis(5); // allow up to 5 minutes for data transfers
FTPClient client = new FTPClient();
client.setConnectTimeout(CON_TIMEOUT);
client.setDataTimeout(LIVE_TIMEOUT);
client.connect(host);
client.setSoTimeout(LIVE_TIMEOUT);
client.login(user, pass);
client.changeWorkingDirectory(dir);
log("client ready");
File file = new File(filePath);
String name = new Date().getTime() + "-" + file.getName();
InputStream fis = null;
try
{
fis = new FileInputStream(file);
if (!client.storeFile(name, fis))
throw new RuntimeException("store failed");
log("store " + name + " complete");
}
finally
{
IOUtils.closeQuietly(fis);
try
{
client.logout();
log("logout");
}
catch (Throwable e)
{
log("logout failed", e);
}
try
{
client.disconnect();
log("disconnect");
}
catch (Throwable e)
{
log("disconnect failed", e);
}
}
還有一些日志:
2010-08-10 21:32:38 client ready
2010-08-10 21:32:49 store 1281439958234-file.zip complete
2010-08-10 21:32:49 logout
2010-08-10 21:32:49 disconnect
2010-08-10 21:32:50 client ready
2010-08-10 21:33:00 store 1281439970968-file.zip complete
2010-08-10 21:33:00 logout
2010-08-10 21:33:00 disconnect
2010-08-10 21:33:02 client ready
2010-08-10 21:33:11 store 1281439982234-file.zip complete
2010-08-10 21:33:11 logout
2010-08-10 21:33:11 disconnect
2010-08-10 21:33:15 client ready
2010-08-10 21:33:25 store 1281439995890-file.zip complete
2010-08-10 21:33:26 logout
2010-08-10 21:33:26 disconnect
2010-08-10 21:33:27 client ready
2010-08-10 21:33:36 store 1281440007531-file.zip complete
2010-08-10 21:33:36 logout
2010-08-10 21:33:36 disconnect
2010-08-10 21:33:37 client ready
2010-08-10 21:33:48 store 1281440017843-file.zip complete
2010-08-10 21:33:48 logout
2010-08-10 21:33:48 disconnect
2010-08-10 21:33:49 client ready
2010-08-10 21:33:59 store 1281440029781-file.zip complete
2010-08-10 21:33:59 logout
2010-08-10 21:33:59 disconnect
2010-08-10 21:34:00 client ready
2010-08-10 21:34:09 store 1281440040812-file.zip complete
2010-08-10 21:34:09 logout
2010-08-10 21:34:09 disconnect
2010-08-10 21:34:10 client ready
2010-08-10 21:34:23 store 1281440050859-file.zip complete
2010-08-10 21:34:24 logout
2010-08-10 21:34:24 disconnect
2010-08-10 21:34:25 client ready
2010-08-10 21:34:35 store 1281440065421-file.zip complete
2010-08-10 21:34:35 logout
2010-08-10 21:34:35 disconnect
請注意，所有這些都在 15 秒內完成，并且服務器上的所有生成文件都已損壞.
Note that all of these were complete within 15 seconds, and all of the resulting files on the server are corrupt.
我也進行了測試，沒有設置任何超時，問題仍然存在.
I have also tested without setting any timeouts and the problem still occurs.
推薦答案
Common FTP 默認為 Ascii 文件類型.在處理 ZIP 文件等二進制數據時，您希望將其設置為 Binary.
Commons FTP defaults to Ascii file types. You want to set it to Binary when dealing with binary data like a ZIP file.
來自 http://commons.apache.org/net/api/org/apache/commons/net/ftp/FTPClient.html
FTPClient 的默認設置是使用 FTP.ASCII_FILE_TYPE 、 FTP.NON_PRINT_TEXT_FORMAT 、 FTP.STREAM_TRANSFER_MODE 和 FTP.FILE_STRUCTURE .唯一直接支持的文件類型是 FTP.ASCII_FILE_TYPE 和 FTP.BINARY_FILE_TYPE .
The default settings for FTPClient are for it to use FTP.ASCII_FILE_TYPE , FTP.NON_PRINT_TEXT_FORMAT , FTP.STREAM_TRANSFER_MODE , and FTP.FILE_STRUCTURE . The only file types directly supported are FTP.ASCII_FILE_TYPE and FTP.BINARY_FILE_TYPE .
您想在發送文件之前執行 setFileType(FTP.BINARY_FILE_TYPE).
You want to do setFileType(FTP.BINARY_FILE_TYPE) before you send the file.
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