Java API V2 Session Upload

hi @christian i had written a logic to upload files to dropbox 

feel free to ask any doubt.

here is the code which upload entire file.

String url_d = "<your download url here>";

long buffer = 33554432; // 32mb buffer
DbxRequestConfig config = new DbxRequestConfig("dropbox/java-tutorial",
"en_US");
DbxClientV2 client = new DbxClientV2(config, ACCESS_TOKEN);
try {
URL url = new URL(url_d);
String sessionId = ";
// Upload Files to Dropbox
String fileName = java.net.URLDecoder.decode(url_d.substring(url_d.lastIndexOf('/') + 1,url_d.length()), "UTF-8");;
HttpURLConnection getLength = (HttpURLConnection) url.openConnection();
getLength.connect();
long size = getLength.getContentLengthLong();
// Start session
HttpURLConnection hc = (HttpURLConnection) url.openConnection();
hc.addRequestProperty("Range", "bytes=0-"+buffer);
hc.connect();
DbxFiles.UploadSessionStartUploader result = client.files.uploadSessionStart();
result.getBody().write(IOUtils.toByteArray(hc.getInputStream()));
UploadSessionStartResult sa = result.finish();
sessionId = sa.sessionId;
hc.disconnect();
if (size > 0) {
//System.out.println("large ");

long s2 = buffer;
long tmp = 0;
//System.out.println("0"+" "+buffer);
while (tmp <= size && (buffer + s2) < size) {
buffer++;
tmp = buffer + s2;
if (tmp < size) {
System.out.println(buffer + "\t" + (tmp)+"\t"+(tmp-buffer));
// Append to session
HttpURLConnection hc1 = (HttpURLConnection) url.openConnection();
hc1.addRequestProperty("Range", "bytes="+buffer+"-"+tmp);
hc1.setReadTimeout(10000);
hc1.connect();
UploadSessionAppendBuilder re1 = client.files.uploadSessionAppendBuilder(sessionId, buffer);
re1.run(hc1.getInputStream());
hc1.disconnect();
buffer = tmp;
}
}
if((tmp+1)+buffer>size){
// finish session
HttpURLConnection hc2 = (HttpURLConnection) url.openConnection();
hc2.addRequestProperty("Range", "bytes="+(tmp+1)+"-"+size);
hc2.setReadTimeout(10000);
hc2.connect();
UploadSessionCursor usc = new UploadSessionCursor(sessionId, (tmp+1));
FileMetadata nn = client.files.uploadSessionFinishBuilder(
usc,
new CommitInfo("/" + fileName, DbxFiles.WriteMode.add,false, new Date(), false))
.run(hc2.getInputStream());
// End
System.out.println("Done");
}
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (UploadException e) {
e.printStackTrace();
} catch (DbxException e) {
e.printStackTrace();
}