How to use

org.jboss.resteasy.plugins.providers.multipart.MultipartFormDataOutput

constructor

  public void writeTo(Map<String, Object> map, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException
  {
   PartType partType = FindAnnotation.findAnnotation(annotations, PartType.class);
   MediaType partMediaType = MediaType.valueOf(partType.value());

   MultipartFormDataOutput output = new MultipartFormDataOutput();
   for (Map.Entry<String, Object> entry : map.entrySet())
   {
     output.addFormData(entry.getKey(), entry.getValue(), partMediaType);
   }
   write(output, mediaType, httpHeaders, entityStream);
  }
}

public void writeTo(Object obj, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException
 MultipartFormDataOutput multipart = new MultipartFormDataOutput();

 WebTarget target = client.target("/some-resource");
MultipartFormDataOutput formData = new MultipartFormDataOutput();
formData.addFormData("file", fileContent, MediaType.TEXT_PLAIN_TYPE.withCharset("utf-8"));
Entity<MultipartFormDataOutput> entity = Entity.entity(formData, MediaType.MULTIPART_FORM_DATA);
Response response = target.request().post(entity);

 MultipartFormDataOutput output = new MultipartFormDataOutput();
           // file (below) doesn't have to be a `byte[]`
           // It can be a `File` object and work just the same
output.addFormData("file", file, MediaType.APPLICATION_OCTET_STREAM_TYPE);

Response response = target.request()
    .post(Entity.entity(output, MediaType.MULTIPART_FORM_DATA));

 WebTarget target = ClientBuilder.newClient().target("some/url");
MultipartFormDataOutput formData = new MultipartFormDataOutput();
Map<String, Object> json = new HashMap<>();
json.put("foo", "bar");
formData.addFormData("json", json, MediaType.APPLICATION_JSON_TYPE);
FileInputStream fis = new FileInputStream(new File("/path/to/image"));
formData.addFormData("image", fis, MediaType.APPLICATION_OCTET_STREAM_TYPE);
Entity<MultipartFormDataOutput> entity = Entity.entity(formData, MediaType.MULTIPART_FORM_DATA);
Response response = target.request().post(entity);

  public void writeTo(Map<String, Object> map, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException
  {
   PartType partType = FindAnnotation.findAnnotation(annotations, PartType.class);
   MediaType partMediaType = MediaType.valueOf(partType.value());

   MultipartFormDataOutput output = new MultipartFormDataOutput();
   for (Map.Entry<String, Object> entry : map.entrySet())
   {
     output.addFormData(entry.getKey(), entry.getValue(), partMediaType);
   }
   write(output, mediaType, httpHeaders, entityStream);
  }
}

 ResteasyClient client = (ResteasyClient) this.client;
ResteasyWebTarget target = client.target("http://localhost:8080").path("path");
MultipartFormDataOutput mdo = new MultipartFormDataOutput();
mdo.addFormData("firstPart", new ByteArrayInputStream("firstContent".getBytes()), MediaType.TEXT_PLAIN_TYPE);
mdo.addFormData("secondPart", new ByteArrayInputStream("secondContent".getBytes()), MediaType.TEXT_PLAIN_TYPE);
GenericEntity<MultipartFormDataOutput> entity = new GenericEntity<MultipartFormDataOutput>(mdo) { };
Response response = target.request().put(Entity.entity(entity, MediaType.MULTIPART_FORM_DATA_TYPE));
response.close();

public void writeTo(Object obj, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException
 MultipartFormDataOutput multipart = new MultipartFormDataOutput();

MultipartFormDataOutput formData = new MultipartFormDataOutput();
formData.addFormData("query", xpath, MediaType.TEXT_PLAIN_TYPE);
formData.addFormData("startIndex", String.valueOf(startIndex), MediaType.TEXT_PLAIN_TYPE);

MultipartFormDataOutput formData = new MultipartFormDataOutput();
formData.addFormData("query", xpath, MediaType.TEXT_PLAIN_TYPE); //$NON-NLS-1$
formData.addFormData("startIndex", String.valueOf(startIndex), MediaType.TEXT_PLAIN_TYPE); //$NON-NLS-1$