Guice + Jersey: custom serialization of entities - dependency-injection

Question

I browsed the stackoverflow and the rest of the web for examples, but I can't find any that go beyond JSON and XML serialization.
In my webapp I want my entities to be serialized as CSV for example.
I understand in Jersey I can implement Providers that implement MessageBodyWriter and MessageBodyReader interfaces (or are these classes to extend? whatever) and then make Jersey to scan a package and find and use these custom implementations. How do I do that with Guice, using the JerseyServletModule?
Is another jax-rs framework integrated with guice nicely?
Thanks!

Answer 1

Instead of scanning the package you should be able to add bindings to your implementation of
MessageBodyWriter. For example:
public class Config extends GuiceServletContextListener {
#Override
protected Injector getInjector() {
return Guice.createInjector(
new JerseyServletModule() {
#Override
protected void configureServlets() {
bind(Service.class);
bind(CsvWriter.class);
serve("/services/*").with(GuiceContainer.class);
}
});
}
}
where CsvWriter.java looks like:
#Singleton
#Produces("text/csv")
#Provider
public class CsvWriter implements MessageBodyWriter<Foo> {
#Override
public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return Foo.class.isAssignableFrom(type);
}
#Override
public long getSize(Foo data, Class<?> type, Type genericType, Annotation annotations[], MediaType mediaType) {
return -1;
}
#Override
public void writeTo(Foo data,
Class<?> type, Type genericType, Annotation[] annotations,
MediaType mediaType, MultivaluedMap<String, Object> headers,
OutputStream out) throws IOException {
// Serialize CSV to out here
}
}
and then have some method in Service that #Produces("text/csv").