Java : Send Multipart File to RESTWebservice

Question

I am using Spring as Technology. Apache HttpClient for calling Webservice. Basic purpose is to upload Multipart File(File is not any image file or video file). but Here My requirement is slightly different. Kindly check below image.

Here You can see first block. It is a simple GUI, having only 2 input tags along with proper form tag.

In second block, There is RESTFul Webservice, which takes Multipart File as parameter and process it. (Upto this it is done).
Now I am stuck here. I want to send this Multipart File to other RESTFul Webservice which consumes Multipart File only.

code Snippet of RESTFUL Webservice : (Commented some questions, need your suggestion)

@RequestMapping(value="/project/add")
public @ResponseBody String addURLListToQueue(
        @RequestParam(value = "file") MultipartFile file,
        @RequestParam(value = "id1", defaultValue = "notoken") String projectName,
        @RequestParam(value = "id2", defaultValue = "notoken") String id2,
        @RequestParam(value = "id3", defaultValue = "notoken") String id3){

HttpClient httpclient = new DefaultHttpClient();
httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);

HttpPost httppost = new HttpPost("http://localhost:8080/fs/project/add");

// 1) Do I need to convert it into File object? (tried but faced 400 Error)
// 2) Is there any provision to send Multipart File as it is?

MultipartEntity mpEntity = new MultipartEntity();
ContentBody cbFile = new FileBody(file, "multipart/form-data");
mpEntity.addPart("file", cbFile);


httppost.setEntity(mpEntity);
System.out.println("executing request " + httppost.getRequestLine());
HttpResponse response = httpclient.execute(httppost);
HttpEntity resEntity = response.getEntity();

System.out.println(response.getStatusLine());
if (resEntity != null) {
  System.out.println(EntityUtils.toString(resEntity));
}
if (resEntity != null) {
  resEntity.consumeContent();
}

httpclient.getConnectionManager().shutdown();
}

}

Questions : How to send Multipart File to RESTFul Webservice using HttpClient?

Vocal

follow this link.youtube.com/watch?v=yr01OEk6FfM – Flagwaving

Are you using CXF or Jersey to build RestFul service? – Roer

@PrafulMakani : I just went through this video. It is not fulfilling my requirement. I want to send multipart file using Apache Httpclient. – Vocal

@Roer : I am using Spring 4.0 RestController annotation to create REST Service with the help of STS plugin in Eclipse. – Vocal

Answer 1

Can you check this file upload apache http client?

Also

HttpPost post = new HttpPost("http://echo.200please.com");
InputStream inputStream = new FileInputStream(zipFileName);
File file = new File(imageFileName);
String message = "This is a multipart post";
MultipartEntityBuilder builder = MultipartEntityBuilder.create();         
builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
builder.addBinaryBody
  ("upfile", file, ContentType.DEFAULT_BINARY, imageFileName);
builder.addBinaryBody
  ("upstream", inputStream, ContentType.create("application/zip"), zipFileName);
builder.addTextBody("text", message, ContentType.TEXT_PLAIN);
// 
HttpEntity entity = builder.build();
post.setEntity(entity);
HttpResponse response = client.execute(post);

Source

Roer