Jersey REST Client : Posting MultiPart data

问题:

I am trying to write a Jersey client app which can post multi part form data to a Restful Jersey service. I need to post a CSV file with the data and a JSON with meta-data. I am using Jersey client 1.18.3. Here is my code (some names have been changed for company confidentiality )...

Client client = Client.create();
WebResource webResource = client.resource("http://localhost:8080/mariam/service/playWithDad");


    FileDataBodyPart filePart = new FileDataBodyPart("file", 
            new File("C:/Users/Admin/Desktop/input/games.csv"));

    String playWithDadMetaJson
    = "{\n"
    + "    \"sandboxIndicator\": true,\n"
    + "    \"skipBadLines\": false,\n"
    + "    \"fileSeparator\": \"COMMA\",\n"
    + "    \"blockSize\": false,\n"
    + "    \"gameUUID\": \"43a004c9-2130-4e75-8fd4-e5fccae31840\",\n"
    + "    \"useFriends\": \"false\"\n"
    + "}\n"
    + "";

    MultiPart multipartEntity = new FormDataMultiPart()
    .field("meta", playWithDadMetaJson, MediaType.APPLICATION_JSON_TYPE)
    .bodyPart(filePart);

    ClientResponse response = webResource.type(MediaType.MULTIPART_FORM_DATA_TYPE).post(multipartEntity);

Right now I am getting a compile error at the last line saying it cannot convert from void to ClientResponse.

I got some guidance on the RestFul service itself previously from this post..

Java Rest Jersey : Posting multiple types of data (File and JSON)

回答1:

"Right now I am getting a compile error at the last line saying it cannot convert from void to ClientResponse."

Look at the javadoc for WebResource. Look at the post(Object) (with Object arg). It returns void.

You need to be using the overloaded post(Class returnType, requestEntity), which return an instance of returnType type.

So you should be doing something like

ClientResponse response = webResource
        .type(MediaType.MULTIPART_FORM_DATA_TYPE)
        .post(ClientResponse.class, multipartEntity);

回答2:

Follow jersey documentation, they provide sample client code. Here is the snippet to post a multipart request:

final MultiPart multiPartEntity = new MultiPart()
        .bodyPart(new BodyPart().entity("hello"))
        .bodyPart(new BodyPart(new JaxbBean("xml"), MediaType.APPLICATION_XML_TYPE))
        .bodyPart(new BodyPart(new JaxbBean("json"), MediaType.APPLICATION_JSON_TYPE));

final WebTarget target = // Create WebTarget.
final Response response = target
        .request()
        .post(Entity.entity(multiPartEntity, multiPartEntity.getMediaType()));