why uploaded zip file via ftp is smaller then original file?

Question

My original zip file is 4KB. When i upload it via ftp on server, the size is smaller namely 3.032KB.it seems to me zip file is corrupted and can't be open. Why it happens? how can be fixed?

ftp code

public static void uploadFilesToServer(String filename){

    File file = new File(filename);
    FTPClient client = new FTPClient();
    FileInputStream fis = null;

    try {
        client.connect("ftpsrv2.koln.de");
        client.login("user", "pass");
        client.setFileType(FTP.BINARY_FILE_TYPE);

        fis = new FileInputStream(filename);
        if(client.storeFile(file.getName(), fis)){
            System.out.println("Upload success");
        }else{
            System.out.println("Upload faild");
        }
        client.logout();
        fis.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

Isn't it 4 k due to the cluster size on your hard-drive? Have you really checked the exact byte size? — aioobe, Mar 20 '12 at 15:14
Define "fixed"--have you verified the file is no longer valid? Or are you just assuming however you're looking at the file size is reporting its actual size in bytes? — Dave Newton, Mar 20 '12 at 15:20
If i put bigger zip file result is the same. uploaded file is smaller and can't be open. seems to be corrupted. — itro, Mar 20 '12 at 15:24

score 3 · Answer 1 · edited May 23 '17 at 12:11

3

Everything is fine, 4kb is the minimum block size of your disk. Have a look at this.

edited May 23 '17 at 12:11

Community

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answered Mar 20 '12 at 15:15

yan.kun

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Everything is not fine because zip file is corrupted and can't be open. – itro Mar 20 '12 at 15:22
As your code seems fine, have you tried uploading a file with an non java based ftp client? Maybe it's a server fault. – yan.kun Mar 20 '12 at 15:34
yes i did with FileZilla and everything is OK. i'm using Win7 64bit, can it cause the problem? – itro Mar 20 '12 at 15:39
Don't think so. Have you tried using the overload of the method, where you can pass the bytesize as the second parameter? – yan.kun Mar 20 '12 at 15:49
which method overload ? – Aman Satija Apr 04 '21 at 09:42

why uploaded zip file via ftp is smaller then original file?

1 Answers1