Apache Commons Net FTP 正在上传损坏的文件

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.

问题是文件间歇性地到达服务器损坏.损坏"是指 WinRAR 告诉我一个 ZIP 文件有一个 意外结束存档".有时文件完全是空的.我注意到大文件 (100kb+) 会发生这种情况，但小文件 (20kb) 也会发生这种情况.

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);
    }
}

还有一些日志:

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

请注意，所有这些都在 15 秒内完成，并且服务器上的所有生成文件都已损坏.

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，没有设置任何超时，问题仍然存在.

I have also tested without setting any timeouts and the problem still occurs.

推荐答案

Common FTP 默认为 Ascii 文件类型.在处理 ZIP 文件等二进制数据时，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 .唯一直接支持的文件类型是 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 .

您想在发送文件之前执行 setFileType(FTP.BINARY_FILE_TYPE).

You want to do setFileType(FTP.BINARY_FILE_TYPE) before you send the file.

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