FTPClient - Java, upload file

Question

I'm trying to do a VERY simple file upload. I want a Java FTPClient that can upload any file I tell it to. But the pdf always gets all messed up and my pdf editor (Adobe) won't open it, saying there is an I/O error.

I'm using the following class:

    import org.apache.commons.net.ftp.FTPClient;
    ....

    FTPClient client = new FTPClient();
    FileInputStream fis = null;

    try {
        client.connect("mydomain.com");
        client.login("user", "password");

        String filename = "myPDF.pdf";
        fis = new FileInputStream(filename);

        client.storeFile("temp.pdf", fis);
        fis.close();
        client.logout();
    } catch (IOException e) {
        e.printStackTrace();
    }

Why doesn't this work, and how do I fix it?

Did you try the answers in your question from half an hour ago? http://stackoverflow.com/questions/5925438/url-connection-ftp-in-java-simple-question — Aleadam, May 08 '11 at 04:47
yup, I'm using an FTPClient now. The question is completely different. — CodeGuy, May 08 '11 at 04:51

score 32 · Accepted Answer · edited May 20 '15 at 11:30

32

It doesn't work because the default transfer mode for FTPClient is FTP.ASCII_FILE_TYPE. You just need to update the configuration to transfer in binary mode.

edited May 20 '15 at 11:30

Taher Khorshidi

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answered Aug 29 '11 at 19:45

An̲̳̳drew

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To transfer in binary mode: `ftp.setFileType(FTP.BINARY_FILE_TYPE)` – DLight Dec 05 '16 at 10:17

score 24 · Answer 2 · edited Nov 15 '11 at 09:40

24

Add this to your file

ftp.setFileType(FTP.BINARY_FILE_TYPE, FTP.BINARY_FILE_TYPE);
ftp.setFileTransferMode(FTP.BINARY_FILE_TYPE);

I had the same problem with xlsx files and this was a good solution.

edited Nov 15 '11 at 09:40

shanethehat

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answered Nov 15 '11 at 08:58

Stevan Buzejic

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I don't think you want to call setFileTransferMode like that -- according to the JavaDoc it's meant to take only the FTP.*_TRANSFER_MODE constants. – Peter Becker Mar 04 '13 at 03:23
2

-1, this answer is wrong and result in wasting my time. Only ftp.setFileType(FTP.BINARY_FILE_TYPE); is required, il you put the 2nd param ftp.setFileType(FTP.BINARY_FILE_TYPE, FTP.BINARY_FILE_TYPE) the file il corrupted ( with pdf and xls ) – amdev Jun 13 '16 at 11:45
Has something changed at FTPClient? Because for me it is FTPClient.BINARY_FILE_TYPE. – sigi Oct 15 '17 at 13:18

score 10 · Answer 3 · answered May 08 '11 at 05:52

It's often forgotten that FTP has two modes of operation - one for text files and the other for binary (image) files. In the good old days, connecting from a command line ftp client, we'd carefully remember to set the transfer mode before requesting a file - or we'd run into exactly the sort of problem you seem to be having. Today a lot of situations seem to default to binary, but not apparently yours.

You probably need to tell your ftp implementation to transfer in binary/image mode.

Your comment just solved a two year problem I was having. Cheers to you. — mk.hd, Apr 01 '15 at 16:13

score 3 · Answer 4 · answered May 08 '11 at 04:26

3

Try to use BufferedInputStream, this is a (working) code sample:

BufferedInputStream bis = new BufferedInputStream(new FileInputStream(f));
res = client.storeFile("File Name", bis);
bis.close();
client.logout();

answered May 08 '11 at 04:26

MByD

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Two short questions - have you tried to open the file on the client machine? have you tried sending a different file? – MByD May 08 '11 at 04:44
yes, other files are fine. and what do you mean open it on the client machine? basically, after I upload it, I download it to my local machine. it's an ftp on a website I own. – CodeGuy May 08 '11 at 04:47
did you have any success opening the file before uploading it? maybe you have a problem in the download mechanism? --I'm not sure about those, just trying to help :S – MByD May 08 '11 at 04:51
1

yeah. the original file is just fine. ugh I'm not sure why it doesn't work. It works fine for other files I've tried like txt files. something special about pdfs. – CodeGuy May 08 '11 at 04:53

score 2 · Answer 5 · answered May 08 '11 at 04:27

2

From documentation

This method does NOT close the given InputStream.

So close the FileInputStream before calling logout()

answered May 08 '11 at 04:27

Bala R

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@reising1 I'm not sure then, Did you try @MByd's suggestion ? – Bala R May 08 '11 at 04:44

score 1 · Answer 6 · answered Oct 14 '13 at 13:43

1

Try this.

objFtpClient.setFileType(FTP.BINARY_FILE_TYPE);

objFtpClient.setFileTransferMode(FTP.BINARY_FILE_TYPE);

objFtpClient.enterLocalPassiveMode();

answered Oct 14 '13 at 13:43

JK Patel

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score 1 · Answer 7 · answered Oct 12 '14 at 14:52

1

For Me only ftp.setFileType(FTP.BINARY_FILE_TYPE, FTP.BINARY_FILE_TYPE) worked, while when I was using ftp.setFileTransferMode(FTP.BINARY_FILE_TYPE) File was getting corrupt.

answered Oct 12 '14 at 14:52

Swarit Agarwal

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score 0 · Answer 8 · answered Jul 17 '11 at 01:05

0

This looks like a bug in the Commons NET library, which affected version 3.0. Try a newer version (3.0.1), which fixed the bug.

answered Jul 17 '11 at 01:05

Paŭlo Ebermann

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FTPClient - Java, upload file

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