Apache Commons Net FTP正在上传损坏的文件 [英] Apache Commons Net FTP is uploading corrupted files
问题描述
我正在尝试使用Apache Commons Net进行FTP文件传输.
I'm trying to use Apache Commons Net for FTP file transfers.
问题是文件间歇性到达服务器损坏. 损坏"是指WinRAR告诉我一个ZIP文件的存档意外结束" .有时文件是完全空的.我注意到，这种情况在较大的文件(100kb +)上发生的更多，但是在较小的文件(20kb)上也会发生.
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).
我知道上传的源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.
我没有从代码中得到任何错误/异常.
I do not get any errors/exceptions from the code.
这是正在执行的代码:
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);
}
}
和一些日志:
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
请注意，所有这些操作均在15秒内完成，并且服务器上的所有结果文件均已损坏.
Note that all of these were complete within 15 seconds, and all of the resulting files on the server are corrupt.
我也进行了测试，未设置任何超时，但问题仍然存在.
I have also tested without setting any timeouts and the problem still occurs.
推荐答案
FTP默认为Ascii文件类型.处理诸如ZIP文件之类的二进制数据时，您希望将其设置为Binary.
Commons FTP defaults to Ascii file types. You want to set it to Binary when dealing with binary data like a ZIP file.
来自 http://commons. apache.org/net/api/org/apache/commons/net/ftp/FTPClient.html
FTPClient的默认设置是使用FTP.ASCII_FILE_TYPE，FTP.NON_PRINT_TEXT_FORMAT，FTP.STREAM_TRANSFER_MODE和FTP.FILE_STRUCTURE.直接支持的唯一文件类型是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 .
您要先执行setFileType(FTP.BINARY_FILE_TYPE)，然后再发送文件.
You want to do setFileType(FTP.BINARY_FILE_TYPE) before you send the file.
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