CODEWITHSUNDEEP
javaandroidservlets
Speise
Speise

Reputation: 809

How to send byte array from Android device to servlet

I need to send some byte array from android device to Servlet. For this I try to use next code:

Servlet:

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws 
ServletException, IOException {

  DataInputStream in = new DataInputStream((InputStream)request.getInputStream());
   response.setContentType("text/plain");
    byte[] buffer = new byte[1024];
    int len = 0;
    File file;
    file=new File(getServletContext().getRealPath("/POST_LOG!!!!.txt"));
    if(!file.exists()){
        file.createNewFile();
    }
    while ((len = in.read(buffer)) > 0) {
          FileOutputStream fos = new FileOutputStream(getServletContext().getRealPath("/POST_LOG!!!!.txt"), true);

           fos.write(buffer);            
           fos.close(); 
    }

    PrintWriter out = response.getWriter();
    out.write("Done");
    out.close();

Device side : 

URL uploadUrl;
    try {
        uploadUrl = new URL(url);
        HttpURLConnection c = (HttpURLConnection) uploadUrl
                .openConnection();
        c.setRequestMethod("POST");

        c.setDoInput(true);
        c.setDoOutput(true);
        c.setUseCaches(false);
        c.connect();
        OutputStream out = c.getOutputStream();

        for (int i = 0; i < 1000; i++) { // generate random bytes for
                                            // uploading
            byte[] buffer = new byte[256];
            for (int j = 0; j < 256; j++) {
                Random r = new Random();
                buffer[j] = (byte) r.nextInt();
            }

            out.write(buffer);
            out.flush();
        }

        out.close();

    } catch (Exception e) {
        MessageBox("Error. " + e.toString());
    }

    return (long) 0;
}

I dont understand why this code doesnt work. When I try to debug my POST method it even not called. I will grateful for your examples

Upvotes: 1

Views: 2110

Answers (2)

Speise
Speise

Reputation: 809

I found the solution. I just changed my device-side code using custom InputStream.

Device side :

HttpPost httpPost = new HttpPost(url);
    httpPost.setEntity(new InputStreamEntity(new MyInputStream(),
            4096 * 1024 * 10));
    HttpResponse response = null;

    try {
        response = httpClient.execute(httpPost);
    } catch (ClientProtocolException e) {
        e.printStackTrace();
        httpPost.abort();
    } catch (IOException e) {
        e.printStackTrace();
        httpPost.abort();
    }

Upvotes: 2

Bozho
Bozho

Reputation: 597116

You have a lot of options:

  • send the byte values: 125,11,25,40 (that's a dumb option)
  • send it base64- or hex- encoded, and then decode it (use apache commons-codec)
  • submit it as multipart/form-data

Upvotes: 0

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