/**
* Service接口
*/
private static final class RestServiceHolder {
   private static final RestService REST_SERVICE =
           RetrofitHolder.RETROFIT_CLIENT.create(RestService.class);     
}

public static RestService getRestService() {
   return RestServiceHolder.REST_SERVICE;
}

public interface RestService {

   @GET
   Call<String> get(@Url String url, @QueryMap WeakHashMap<String, Object> params);

   @FormUrlEncoded
   @POST
   Call<String> post(@Url String url, @FieldMap WeakHashMap<String, Object> params);

   @POST
   Call<String> postRaw(@Url String url, @Body RequestBody body);

   @FormUrlEncoded
   @PUT
   Call<String> put(@Url String url, @FieldMap WeakHashMap<String, Object> params);

   @PUT
   Call<String> putRaw(@Url String url, @Body RequestBody body);

   @DELETE
   Call<String> delete(@Url String url, @QueryMap WeakHashMap<String, Object> params);

   @Streaming
   @GET
   Call<ResponseBody> download(@Url String url, @QueryMap WeakHashMap<String, Object> params);

   @Multipart
   @POST
   Call<String> upload(@Url String url, @Part MultipartBody.Part file);

}