Send File as a parameter to a REST Service, from a client?

Question

My Requirement is to send the file to the REST Service through one client. That service is going to process the file. I am using Jersey API for implementing this. But I have sea

Answer 1

Assuming you are using Jersey on both the client and server side, here is some code that you can extend:

Server side:

@POST
@Path("/")
@Produces(MediaType.TEXT_PLAIN)
@Consumes(MediaType.MULTIPART_FORM_DATA)
public Response uploadFile(final MimeMultipart file) {
    if (file == null)
        return Response.status(Status.BAD_REQUEST)
                .entity("Must supply a valid file").build();

    try {
        for (int i = 0; i < file.getCount(); i++) {
            System.out.println("Body Part: " + file.getBodyPart(i));
        }
        return Response.ok("Done").build();
    } catch (final Exception e) {
        return Response.status(Status.INTERNAL_SERVER_ERROR).entity(e)
                .build();
    }
}

The above code implements a resource method that accepts POST's of multipart (file) data. It also illustrates how you can iterate through all the individual body parts in the incoming (multipart) request.

Client:

final ClientConfig config = new DefaultClientConfig();
final Client client = Client.create(config);

final WebResource resource = client.resource(ENDPOINT_URL);

final MimeMultipart request = new MimeMultipart();
request.addBodyPart(new MimeBodyPart(new FileInputStream(new File(
        fileName))));

final String response = resource
    .entity(request, "multipart/form-data")
    .accept("text/plain")
    .post(String.class);

The above code simply attaches a file to a multipart request, and fires the request off to the server. For both client and server side code there is a reliance on the Jersey and JavaMail libraries. If you are using Maven, these can be pulled down with ease, with the following dependencies:

    com.sun.jersey
    jersey-core
    1.17


 
    com.sun.jersey
    jersey-server
    1.14


 
    com.sun.jersey
    jersey-client
    1.17



    com.sun.jersey
    jersey-json
    1.17



    javax.mail
    mail
    1.4.6

Adjust the dependency versions as required