How do I do a multipart/form file upload with jax-rs?

Question

(specifically RESTeasy)

It would be nice (for a single file) to have a method signature like:

public void upload(@FormParam("name") ..., @FormParam("file") file: InputStream) ...  

doable? or am I dreaming? doesn't seem to be that simple.

Answer 1

The key is to leverage the @MultipartForm annotations that comes with RESTEasy. This enables you to define a POJO that contains all the parts of the form and bind it easily.

Take for example the following POJO:

public class FileUploadForm {     private byte[] filedata;      public FileUploadForm() {}      public byte[] getFileData() {         return filedata;     }      @FormParam("filedata")     @PartType("application/octet-stream")     public void setFileData(final byte[] filedata) {         this.filedata = filedata;     } } 

Now all you need to do is use this POJO in the entity which would look something like this:

@POST @Path("/upload") @Consumes("multipart/form-data") public Response create(@MultipartForm FileUploadForm form)  {     // Do something with your filedata here }