The thing is I'm trying to upload an image to a server. The image has to be uploaded by chunks of 256kb and I need to pass the chunks count and id with every call. I can get the total number of chunks to upload and I'm using a BufferedInputStream to get the chunks bytes. But when I finish to upload all the chunks the image showed is always corrupted.
My code so far:
int chunkSize = 255 * 1024;
final long size = mFile.length();
final long chunks = mFile.length() < chunkSize? 1: (mFile.length() / chunkSize);
int chunkId = 0;
BufferedInputStream stream = new BufferedInputStream(new FileInputStream(mFile));
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "RQdzAAihJq7Xp1kjraqf";// random data
for (chunkId = 0; chunkId < chunks; chunkId++) {
URL url = new URL(urlString);
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(20000 /* milliseconds */);
conn.setConnectTimeout(20000 /* milliseconds */);
// Allow Inputs
conn.setDoInput(true);
// Allow Outputs
conn.setDoOutput(true);
// Don't use a cached copy.
conn.setUseCaches(false);
// Use a post method.
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary="+boundary);
dos = new DataOutputStream( conn.getOutputStream() );
dos.writeBytes(twoHyphens + boundary + lineEnd);
String param1 = ""+chunkId;
String param2 = ""+chunks;
String param3 = mFile.getName();
// for every param
dos.writeBytes("Content-Disposition: form-data; name=\"chunk\"" + lineEnd);
dos.writeBytes("Content-Type: text/plain; charset=UTF-8" + lineEnd);
dos.writeBytes("Content-Length: " + param1.length() + lineEnd);
dos.writeBytes(lineEnd);
dos.writeBytes(param1 + lineEnd);
dos.writeBytes(twoHyphens + boundary + lineEnd);
// Send parameter #chunks
dos.writeBytes("Content-Disposition: form-data; name=\"chunks\"" + lineEnd);
dos.writeBytes("Content-Type: text/plain; charset=UTF-8" + lineEnd);
dos.writeBytes("Content-Length: " + param2.length() + lineEnd);
dos.writeBytes(lineEnd);
dos.writeBytes(param2 + lineEnd);
dos.writeBytes(twoHyphens + boundary + lineEnd);
// Send parameter #name
dos.writeBytes("Content-Disposition: form-data; name=\"name\"" + lineEnd);
dos.writeBytes("Content-Type: text/plain; charset=UTF-8" + lineEnd);
dos.writeBytes("Content-Length: " + param4.length() + lineEnd);
dos.writeBytes(lineEnd);
dos.writeBytes(param3 + lineEnd);
dos.writeBytes(twoHyphens + boundary + lineEnd);
// Send parameter #file
dos.writeBytes("Content-Disposition: form-data; name=\"file\";filename=\"" + param4 + "\"" + lineEnd); // filename is the Name of the File to be uploaded
dos.writeBytes("Content-Type: image/jpeg" + lineEnd);
dos.writeBytes(lineEnd);
byte[] buffer = new byte[chunkSize];
stream.skip(chunkId * chunkSize);
stream.read(buffer);
// dos.write(buffer, 0, bufferSize);
dos.write(buffer);
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
dos.flush();
dos.close();
// read response...
}
Many thanks!
