How to Upload Files with Embedded Entity Data in a Jersey RESTful Web Service?

File Upload with Entity Data in a Jersey RESTful Web Service

Problem:

The task is to create an employee record while uploading a corresponding image in a single REST call. The objective is to achieve this functionality in a seamless and efficient way.

Solution:

In order to accomplish this objective, it is important to understand that having multiple Content-Types in the same request is not supported. Instead, the employee data should be included as part of the multipart request.

The following code snippet illustrates how to achieve this:

@POST
@Path("/upload2")
@Consumes({MediaType.MULTIPART_FORM_DATA, MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
public Response uploadFileWithData(
    @FormDataParam("file") InputStream fileInputStream,
    @FormDataParam("file") FormDataContentDisposition contentDispositionHeader,
    @FormDataParam("emp") Employee emp) {

    // Business logic

}

Here, the @FormDataParam("emp") annotation helps in extracting the employee data from the multipart request. Additionally, the Employee class should be defined with appropriate getter and setter methods.

Multipart Testing:

To test the multipart functionality, the MultiPartFeature class can be registered with the Jersey client using register(MultiPartFeature.class). For instance, the following test snippet can be used:

@Test
public void testGetIt() throws Exception {
    
    final Client client = ClientBuilder.newBuilder()
        .register(MultiPartFeature.class)
        .build();
    WebTarget t = client.target(Main.BASE_URI).path("multipart").path("upload2");

    FileDataBodyPart filePart = new FileDataBodyPart("file", 
                                             new File("stackoverflow.png"));
    String empPartJson
            = "{ ... employee data as JSON ... }";

    MultiPart multipartEntity = new FormDataMultiPart()
            .field("emp", empPartJson, MediaType.APPLICATION_JSON_TYPE)
            .bodyPart(filePart);
          
    Response response = t.request().post(
            Entity.entity(multipartEntity, multipartEntity.getMediaType()));
    System.out.println(response.getStatus());
    System.out.println(response.readEntity(String.class));

    response.close();
}

This test creates a multipart request that includes both the image and the employee data.

Considerations:

• Some clients, like Postman, may not allow setting individual body part Content-Types. However, you can explicitly set the Content-Type before deserializing the data by using jsonPart.setMediaType(MediaType.APPLICATION_JSON_TYPE);.
• Alternatively, you can use a String parameter and deserialize the JSON data manually using a JSON library.

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