我注意到，jCIFS对读取的每个块都执行了操作"(afair jcifs.smb.SmbTransport.checkStatus(..))，即每个读入缓冲区的块.这意味着增加缓冲区的大小实际上可能会加快速度，尽管实际的问题仍然存在，但只会发生1到2次，对整体时间的影响较小.

设置"jcifs.util.loglevel = 3"并查看真正的错误是很有帮助的.

在我的情况下，我不得不最后设置"jcifs.smb.client.dfs.disabled = false"，因为"jcifs.resolveOrder = DNS"无济于事..

I'm trying to copy a file from my local machine to Shared folder in a windows server. This is the function which I used.

public static void copyFileUsingJcifs(final String domain, final String userName, final String password, final String sourcePath, final String destinationPath) throws IOException {
    final NtlmPasswordAuthentication auth = new NtlmPasswordAuthentication(domain, userName, password);
    final SmbFile sFile = new SmbFile(destinationPath, auth);
    final SmbFileOutputStream smbFileOutputStream = new SmbFileOutputStream(sFile);
    final FileInputStream fileInputStream = new FileInputStream(new File(
            sourcePath));

    final byte[] buf = new byte[16384];
    int len;
    while ((len = fileInputStream.read(buf)) > 0) {
        smbFileOutputStream.write(buf, 0, len);
    }
    fileInputStream.close();
    smbFileOutputStream.close();
}

I tried this answer, but didn't work for me. When I do normal copying(Copy and Paste) it only takes maximum of 8minutes for a 25MB file. But when I use my java program using this function its taking more than 20minutes. How can I make this copying faster? Thanks in advance.

What I noticed is that jCIFS does "something" (afair jcifs.smb.SmbTransport.checkStatus(..)) for every chunk it reads - i.e. for each chunk that is read into the buffer. That means increasing your buffer size might really speed things up, although the real problem still exists, but only occurs 1 or 2 times having a lower impact on the overall time..

It helps a lot to set "jcifs.util.loglevel=3" and have a look what's really wrong..

In my case I had to set "jcifs.smb.client.dfs.disabled=false" in the end, as "jcifs.resolveOrder=DNS" didn't help..