JAX-RS球衣-Web服务资源合作

Question

I am implementing a restful web service using Jersey (Jax-rs).

I have two resources:

/news : returns a list of news

/countries : returns a list of countries

And I want to implement something to allow me to get the news of a certain country.

Something like : /countries/{countryId}/news

How, and where I should implement it?

News Resource Code:

@Path("/news")
public class NewsResource {

    NewsService newsService = new NewsService();

    @GET
    @Produces(MediaType.APPLICATION_JSON)
        public List<News> getNews(){
            return newsService.getNews();
    }

}

Countries Resource Code:

@Path("/countries")
public class CountriesResource {

    CountriesService countriesService = new CountriesService();

    @GET
    @Produces(MediaType.APPLICATION_JSON)
        public List<Countries> getCountries(){
            return countriesService.getCountries();
    }

}

I can do it by adding the following method to the Countries class.

@Path("/{countryId}/news")
    @Produces(MediaType.APPLICATION_JSON)
    public List<News> getCountryNews(@PathParam("countryId") int countryId){
        return countryService.getCountryNews(countryId);
    }

But, this way, my Countries resource is returning news, which I don't find logical!

Answer 1

Here comes the solution:

News Resource Code:

@Path("/news")
public class NewsResource {

    NewsService newsService = new NewsService();

    @GET
    public List<News> getNews(@PathParam("countryId") int countryId){
        if(countryId==null){
            return newsService.getNews();
        }else{
            return newsService.getCountryNews(countryId);
        }
    }

}

Countries Resource Code:

@Path("/countries")
public class CountriesResource {

    CountriesService countriesService = new CountriesService();

    @GET
    @Produces(MediaType.APPLICATION_JSON)
        public List<Countries> getCountries(){
            return countriesService.getCountries();
    }

    @Path("/{countryId}/news")
    public NewsResource getCountryNews(){
        return new CountryResource();
    }

}

When calling /news since countryId is null, we get all news.

When calling countries/{countryId}/news , we call the news resource from the countries resource, and since countryId contains the id of the country for which we want to get the news, we call the getCountryNews(countryId) method.