How to get copy of InputStream?

Question

I have gotten HttpURLConnection inputStream:

    URL url = new URL(urlString);
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setReadTimeout(10000 /* milliseconds */);
    conn.setConnectTimeout(15000 /* milliseconds */);
    conn.setRequestMethod("GET");
    conn.setDoInput(true);
    // Starts the query
    conn.connect();
    InputStream stream = conn.getInputStream();

Now I want to produce two copy of this inputStream, one is used to store to a file, and the other one is used to parse, but after I stored, the inputStream is invalid to parse:

        BufferedInputStream bis = new BufferedInputStream(inStream);
        try {
            byte[] buffer = new byte[1024];

            if (inStream.markSupported()) {
                inStream.mark(1);                   
            }
            int bytesRead = 0;
            while ((bytesRead = bis.read(buffer)) != -1) {
                Log.d(TAG, "buffer: "+new String(buffer));
                outStream.write(buffer, 0, bytesRead);
            }
            outStream.flush();
            inStream.reset();
            outStream.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

Now how to get this inputStream entirely again?

Does not help http://stackoverflow.com/questions/5923817/how-to-clone-an-inputstream? — Pankaj Kumar, Nov 05 '14 at 11:49
@RC. It seems Android doesn't support CloseShieldInputStream — Victor S, Nov 05 '14 at 11:55
@PankajKumar It seems Android doesn't support CloseShieldInputStream? — Victor S, Nov 05 '14 at 11:56
This might be helpful for you, [How to clone an Input Stream](http://stackoverflow.com/questions/5923817/how-to-clone-an-inputstream)! — Adheep, Nov 05 '14 at 11:58
@Adheep The CloseShieldInputStream is not an Android public class — Victor S, Nov 05 '14 at 12:01
My bad, I should have been more specific, check out this answer in that post http://stackoverflow.com/a/5924132/1161998 — Adheep, Nov 05 '14 at 12:05
Why don't you just parse the file after you created it from the inputstream ? Just create a FileInputStream on the file. — Olivier Masseau, Nov 05 '14 at 14:53

score 3 · Accepted Answer · answered Nov 05 '14 at 11:49

3

Use http://commons.apache.org/proper/commons-io/ Commons-IO to get a byte[] of the data in the InputStream

byte[] data = IOUtils.toByteArray(httpsURLConnection.getInputStream());

Then store the data in a file by writing it in an OutputStream, then do with the data whatever you want.

answered Nov 05 '14 at 11:49

EpicPandaForce

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Do you mean I need add an extra jar to use this IOUtils? – Victor S Nov 05 '14 at 11:58
Yep, commons-io binary jar, it does all the buffering and stuff for you, and your second code section can be removed and replaced with this one line – EpicPandaForce Nov 05 '14 at 12:04

score 0 · Answer 2 · answered Nov 05 '14 at 11:48

0

Now how to get this inputStream entirely again?

You do everything all over again, starting with HttpURLConnection conn = (HttpURLConnection) url.openConnection();.

Or, you do two things with with bytes as you download them, rather than downloading them twice.

Or, you use the stream from HTTP to download to the file, then you read in the file for parsing.

answered Nov 05 '14 at 11:48

CommonsWare

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The http server content changes every second, if get again, it is not the same content. – Victor S Nov 05 '14 at 11:57
@VictorS: Then your options are the second and third ones in my answer: do two things with the bytes as you download them (more efficient but perhaps more difficult to code), or read in the file once you save it (easier but adds more disk I/O). – CommonsWare Nov 05 '14 at 11:59

How to get copy of InputStream?

2 Answers2