Re: [Resteasy-developers] java.lang.String JSON formated

[Jeff S. <je...@in...>]

[ugh, send failure]

On Thu, Sep 8, 2011 at 12:51 PM, Jeff Schnitzer <je...@in...> wrote:
>
> // Produces 'hello', which produces parse errors in browsers and ObjectMapper
> Object getThing() { return "hello"; }

To make this a little more concrete, I'd like to know how you folks
propose implementing this method:

public class NameResource {
   @GET
   @Path("/{id}")
   @Produces(MediaType.APPLICATION_JSON)
   public String getNameForThing(@PathParam("id") long id) {
      return actuallyLookupTheNameFor(id);
   }
}

Here's how I've solved the problem, which feels like working around
broken behavior in Resteasy:

@Provider
@Produces(MediaType.APPLICATION_JSON)
public class StringJacksonProvider implements MessageBodyWriter<String>
{
	@Override
	public boolean isWriteable(Class<?> aClass, Type type, Annotation[]
annotations, MediaType mediaType)
	{
		return MediaType.APPLICATION_JSON_TYPE.equals(mediaType) && aClass
== String.class;
	}

	@Override
	public long getSize(String value, Class<?> type, Type genericType,
Annotation[] annotations, MediaType mediaType)
	{
		return -1;
	}

	@Override
	public void writeTo(String value, Class<?> type, Type genericType,
Annotation[] annotations, MediaType mediaType,
MultivaluedMap<String,Object> httpHeaders, OutputStream entityStream)
	{
		try {
			new ObjectMapper().writeValue(entityStream, value);
		} catch (IOException ex) {
			throw new RuntimeException(ex);
		}
	}
}