How to send an image from android to servlet and then store it

Question

I am trying to send a photo over http to my server. So i convert the image to bytes and then i send it across as a name value pair. Here is my code below for doing so. Now my trouble is the server side, how can i recreate and store the image from the string of bytes recieved

i also am using java servlets

Code on android

ByteArrayOutputStream baos = new ByteArrayOutputStream();
pinnedV.getPhoto().compress(Bitmap.CompressFormat.PNG, 100, baos);
byte[] b = baos.toByteArray();

List<NameValuePair> params = new ArrayList<NameValuePair>(2);
params.add(new BasicNameValuePair("photo",new String(b)));

HttpClient httpclient = new DefaultHttpClient();  
    HttpPost request = new HttpPost(URL);

    try {
        request.setEntity(new UrlEncodedFormEntity(params));
    } catch (UnsupportedEncodingException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }
    ResponseHandler<String> handler = new BasicResponseHandler();  
     try {  
         result = httpclient.execute(request, handler);  
     } catch (ClientProtocolException e) {  
         e.printStackTrace();  
     } catch (IOException e) {  
         e.printStackTrace();  
    }

Code on server

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

String fromClientphoto= request.getParameter("photo");
byte[] b = fromClientphoto.getBytes();

FileOutputStream fos = new FileOutputStream("D:\\img.png");
     fos.write(b);
     fos.close(); 
}

This above code writes a file but it will not open as an image. also is this byte[] b = fromClientphoto.getBytes(); the correct way to convert back to same bytes as on the android phone? any ideas?

I don't know anything about `ToolkitImage` so I doubt I can be of any help. — Haphazard, Jun 10 '11 at 18:29
@Haphazard but am i sending the image in the correct manner, also if there is a different way could you help? — molleman, Jun 10 '11 at 18:30
Can you confirm if any data makes it to the server? Debug or print out the size of the `b` array. — Haphazard, Jun 10 '11 at 18:34
@Haphazard yes the fromClientphoto string is filled with data . i did a quick println of it — molleman, Jun 10 '11 at 18:37
Did you try writing `fromClientphoto` to a file? Or the byte array? — Haphazard, Jun 10 '11 at 18:39
edit added above....tried writing straight to file, that does not work — molleman, Jun 10 '11 at 18:48

score 0 · Accepted Answer · answered Jun 10 '11 at 18:57

0

Don't bother with the toolkit image, just write the contents out to a file..

can you post an image to the Servlet outside of android? setup a dummy page that does the same thing through a basic HTML Form, break down the problem into smaller and smaller pieces until you figure out whhich piece is causing the problem...

answered Jun 10 '11 at 18:57

Dave

867
6
11

So the image is converted to bytes and then a string is made from them bytes on the android phone......then server side i call the above to convert from the string to bytes...and then i write it to a file – molleman Jun 10 '11 at 19:00

score 0 · Answer 2 · edited May 23 '17 at 12:03

You should not send a file (i.e. image) as a regular name-value parameter from your device and read it with request.getParameter(name);.

Instead:

In the Android side, use a MultipartEntity (see other questions). It is already part of httpclient.
In the server side, you can find apache-fileupload useful (or other library that can help you to read the multipart content you receive in your servlet)

How to send an image from android to servlet and then store it

2 Answers2