How to copy file from SMB share to local drive not in domain with JCIFS

Question

I'm trying to copy some remote files to the local drive, in Java, using JCIFS. The remote machine is inside a domain. The local machine is not in a domain.

The following code works, but it's really slow (2 minutes for 700Kb... and I have many Mb...):

SmbFile remoteFile = new SmbFile("smb://...")
OutputStream os = new FileOutputStream("/path/to/local/file");
InputStream is = remoteFile.getInputStream();
int ch;
while ((ch = is.read()) != -1) {
    os.write(ch);
}
os.close();
is.close();

I think I could use SmbFile.copyTo(), but I don't know how to access the local file. If I write the following, I get a connection error:

localfile = new SmbFile("file:///path/to/localfile")

This question is related to How to copy file from smb share to local drive using jcifs in Java?

Answer 1

You just need to make bigger buffer:

SmbFile remoteFile = new SmbFile("smb://...")
try(OutputStream os = new FileOutputStream("/path/to/local/file")){
try(InputStream is = remoteFile.getInputStream())
{
    int bufferSize = 5096;

    byte[] b = new byte[bufferSize];
    int noOfBytes = 0;
    while ((noOfBytes = is.read(b)) != -1) {
        os.write(b, 0, noOfBytes);
    }
}}

Here some test I've done with file 23 Mb, using mentioned code.

bufferSize = 1024 Elapsed time : 10.9587606066 sec

bufferSize = 4096 Elapsed time : 5.6239662951 sec

bufferSize = 5096 Elapsed time : 5.0798761245 sec

bufferSize = 5096 Elapsed time : 4.879439883 sec

bufferSize = 10240 Elapsed time : 4.0192989201 sec

bufferSize = 50240 Elapsed time : 3.8876541543 sec

bufferSize = 100240 Elapsed time : 3.742167582 sec