Develop Reference

Android how to improve the download speed

My code download speed to reach the desired effect,how to improve the download speed
The code is as follows:
URL url = new URL("www.google.com");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
InputStream inStream = conn.getInputStream();
RandomAccessFile threadfile = new RandomAccessFile(saveFile, "rwd");
byte[] buffer = new byte[8192];
int byteCount= 0;
while((byteCount = inStream.read(buffer)) != -1){
threadfile.write(buffer,0,byteCount);
}

Your download speed will only be as fast as the bandwidth supplied to you by the ISP in use and the rate at which the server you request from sends back to you. Your code is fine, the speed depends primarily on the ISP.

uploading bytes to server via outputstream

I am trying to upload some bytes to the server for 15 seconds.I have written the following code to write the bytes to output stream :
long uploadedBytes=0;
ByteArrayInputStream byteArrayInputStream=null;
OutputStream outputStream=null;
try {
byte[] randomData=generateBinData(5*1024);
byte[] bytes = new byte[(int) 1024 * 5];
URL url = new URL(urls[0]);
HttpURLConnection connection =
(HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setUseCaches(false);
connection.setRequestMethod("POST");
connection.setRequestProperty("Connection", "Keep-Alive");
outputStream = connection.getOutputStream();
byteArrayInputStream = new ByteArrayInputStream(randomData);
long startTime=System.currentTimeMillis();
while(byteArrayInputStream.read(bytes) > 0
&& timeDiff < 15000) {
outputStream.write(bytes, 0, bytes.length);
uploadedBytes += bytes.length;
byteArrayInputStream = new ByteArrayInputStream(randomData);
timeDiff = System.currentTimeMillis() - startTime;
int progress=(int)(timeDiff *100 / 15000);
publishProgress(progress);
}
But the progress for the above upload is running very fast and it shows large amount of bytes uploaded within seconds.Which is not according to my 2g mobile network connection.
For example it shows :
uploadedBytes =9850880 and with time difference(timeDiff) = 3 sec.
if i run the same code for 15 seconds it terminates the whole application.
Please help me to find where i am goind wrong.
thanks ...waiting for reply

Unless you set chunked or streaming transfer mode, HttpURLConnection buffers all the output before sending any of it, so it can get a Content-Length. So what you're seeing is the progress of the buffering, not of the transfer. Set chunked transfer mode and you will see a difference.
Your copy loop is wrong. It should be like this:
while ((count = in.read(buffer)) > 0)
{
out.write(buffer, 0, count);
}
Your code will probably work in this specific case but that's not a reason not to get it right for all cases.

check your random byte length. i think the generateBinData() method is not generating 5Kb of data.
sure the uploadedBytes is huge. say, if a write to outputstream takes 10 milisec to write 5Kb(5*1024) of data,in 3 second you should able to write only 153600 bytes.
Reason for app termination - check if any read operation throws exception.

Send a file with a PUT request using a HttpURLConnection

I'm trying to do something relatively simple. I need to make a simple PUT request with a file in the body in order to upload a file to a server not in my control. Here's the code I have so far:
connection = ((HttpURLConnection)new URL(ticket.getEndpoint()).openConnection());
connection.setRequestMethod("PUT");
connection.setRequestProperty("Content-Type", "video/mp4");
connection.setRequestProperty("Content-Length", String.valueOf(getStreamFile().length()));
connection.setUseCaches(false);
connection.setDoOutput(true);
connection.connect();
outputStream = connection.getOutputStream();
streamFileInputStream = new FileInputStream(getStreamFile());
streamFileBufferedInputStream = new BufferedInputStream(streamFileInputStream);
byte[] streamFileBytes = new byte[getBufferLength()];
int bytesRead = 0;
int totalBytesRead = 0;
while ((bytesRead = streamFileBufferedInputStream.read(streamFileBytes)) > 0) {
outputStream.write(streamFileBytes, 0, bytesRead);
outputStream.flush();
totalBytesRead += bytesRead;
notifyListenersOnProgress((double)totalBytesRead / (double)getStreamFile().length());
}
outputStream.close();
logger.debug("Wrote {} bytes of {}, ratio: {}",
new Object[]{totalBytesRead, getStreamFile().length(),
(double)totalBytesRead / (double)getStreamFile().length()});
I'm watching my network manager and nothing near the size of my file gets sent. In fact, I don't know if anything is being sent at all, but I don't see any errors thrown.
I need to be able to send this request and also measure the status of the upload synchronously, so as to be able to inform my listeners of the upload progress. How can I modify my existing example to just work™?

Try setting the content-type param to multipart/form-data. W3C forms.

Android copying large inputstream to file very slow

I have an app that is downloading a zip file and then copying this file to a temporary file on the sd card on the phone, but it is being very very slow.
InputStream in = new BufferedInputStream(url.openStream(), 1024);
File tempFile = File.createTempFile("arc", ".zip", targetDir); //target dir is a file
String tempFilePath = tempFile.getAbsolutePath();
OutputStream out = new BufferedOutputStream(new FileOutputStream(tempFile));
//copying file (in different void)
byte[] buffer = new byte[8192];
int len;
len = in.read(buffer);
enter code here
//it loops here for AGES
while (len >= 0) {
out.write(buffer, 0, len);
len = in.read(buffer);
}
in.close();
out.close();
My file is about 20MB, initially I had the buffer size of 1024, and changed it to 8192 thinking it may speed it up but it seemed to make no difference? I always finishes, and I get no errors it just takes ages!
I have searched to try and find a solution but I'm not coming up with anything so I may be going about this totally the wrong way?
Can anyone see what I'm doing wrong?
Bex

Donot increase buffer size. That may cause your application MemoryOutOfBoundsException.
There are varous factors for which your download will be slow. Weak internet connection, Weak file transfer and receiveing mode is also responsible. It also depend on capacity of device. Check whether you are using following code to create inputstream
URL u = new URL("enter url url here");
HttpURLConnection c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
c.setDoOutput(true);
c.connect();
InputStream in = c.getInputStream();
Thanks
Deepak

Wanted to know how to ftp the file from remote server

Can anyone help me how to ftp the file from the remote server (to which I have successfully established the connection?) I heard I need to have ftpclient.jar for ftp_ing the file to the local system(Windows). Is it so? If so can anyone help me in getting the jar please?

You can see a tutorial and various available libraries on that link: http://www.javaworld.com/javaworld/jw-04-2003/jw-0404-ftp.html

You can use java.net API:
URL url =
new URL("ftp://user:pass#ftp.example.com/file.zip");
URLConnection connection = url.openConnection();
BufferedInputStream in =
new BufferedInputStream(connection.getInputStream());
FileOutputStream out =
new FileOutputStream("file.zip");
int read = 0;
byte[] data = new byte[1024];
while ((read = in.read(data)) >= 0) {
out.write(data, 0, read);
}
out.close();
in.close();