Embedding a File Attachment in JSON Object

Question

Is it possible to embed a file attachment in a JSON Object. I have a HTML Form, which has several text field inputs and a file attachment. I want to send a JSON Object wrapping all these form data (including the file attachment) to the server.

Are there any particular libraries in Java available to do that? Can you give possible solution for this.

Thanks

stackoverflow.com/questions/1443158/…

Jonline
– Jonline

2014-03-26 17:32:57 +00:00
Commented Mar 26, 2014 at 17:32 — Jonline
– Jonline, Commented Mar 26, 2014 at 17:32

Starscream1984 · Accepted Answer · 2014-03-26 17:33:21Z

6

If you want to send the actual data of the file, you'd probably want to encode it as a base64 string and send that in your JSON - see fiddle for example of encoding it in javascript:

http://jsfiddle.net/eliseosoto/JHQnk/

Then you could do the opposite on your server-side using whatever language and/or libraries are appropriate.

answered Mar 26, 2014 at 17:33

Starscream1984

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2 Comments

Mr Boss Over a year ago

Encoding to base64 will also increase the file size by ~33% but if you are ok with that this is a pretty easy way of getting the job done.

Chinthaka Dharmasiri Over a year ago

@YuvalBoss I guess you are right. That is a concern. Larger file attachments create bulky JSON object. thats a disadvantage. In terms of the question I have asked, this seems to be the right answer and it works.

Community · Accepted Answer · 2017-05-23 11:45:02Z

1

Use MultipartEntity, someone else posted a similar question: How to send file in JSON on android? You could also consider saving the files on the server and sending a path/url to the file location where the other server can access them.

 public String SendToServer(String aUrl,File Filename)
        {
            HttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(filename);

            try 
            {
                MultipartEntity entity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
                entity.addPart("file", new FileBody(Filename));
                entity.addPart("video-title", new StringBody("Video"));
                entity.addPart("video-type", new StringBody("1"));
                httpPost.setEntity(entity);

                HttpContext context = new BasicHttpContext();
                // Bind custom cookie store to the local context
                context.setAttribute(ClientContext.COOKIE_STORE, Globals.sessionCookie);

                HttpResponse response = httpClient.execute(httpPost, context);
                HttpEntity resEntity = response.getEntity();  
                String Response = "";
                if (response != null) 
                {    
                    Response = EntityUtils.toString(resEntity); 
                }
                return Response;
            } 
            catch (IOException e) 
            {
                e.printStackTrace();
            }

            return "Exception";
        }

edited May 23, 2017 at 11:45

CommunityBot

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answered Mar 26, 2014 at 17:36

Mr Boss

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1 Comment

Chinthaka Dharmasiri Over a year ago

I guess in terms of a sustainable solution, uploading the file to a file server and mapping the file url with the request is a good option. Thanks for your suggestion.

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