問(wèn)題描述

我正在嘗試使用 Apache Commons Net 進(jìn)行 FTP 文件傳輸.

I'm trying to use Apache Commons Net for FTP file transfers.

問(wèn)題是文件間歇性地到達(dá)服務(wù)器損壞.損壞"是指 WinRAR 告訴我一個(gè) ZIP 文件有一個(gè) 意外結(jié)束存檔".有時(shí)文件完全是空的.我注意到大文件 (100kb+) 會(huì)發(fā)生這種情況，但小文件 (20kb) 也會(huì)發(fā)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(méi)有從代碼中得到任何錯(cuò)誤/異常.

I do not get any errors/exceptions from the code.

這是正在執(zhí)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(qǐng)注意，所有這些都在 15 秒內(nèi)完成，并且服務(wù)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(jìn)行了測(cè)試，沒(méi)有設(shè)置任何超時(shí)，問(wèn)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(rèn)為 Ascii 文件類型.在處理 ZIP 文件等二進(jìn)制數(shù)據(jù)時(shí)，您希望將其設(shè)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(lái)自 http://commons.apache.org/net/api/org/apache/commons/net/ftp/FTPClient.html

FTPClient 的默認(rèn)設(shè)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(fā)送文件之前執(zhí)行 setFileType(FTP.BINARY_FILE_TYPE).

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

這篇關(guān)于Apache Commons Net FTP 正在上傳損壞的文件的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！