java - 使用 JAX-RS 继承

Question

我正在为我的网络服务使用 JAX-RS。我有共同的功能，想使用继承。我提供简单的 CRUD 操作。我已经定义了一个这样的接口(interface):

public interface ICRUD {

    @POST
    @Consumes("application/json")
    @Produces("application/json")
    @Path("create")
    public String createREST(String transferObject);

    @GET
    @Consumes("application/json")
    @Produces("application/json")
    @Path("retrieve/{id}")
    public String retrieveREST(@PathParam("id") String id);

    @POST
    @Consumes("application/json")
    @Produces("application/json")
    @Path("update")
    public void updateREST(@Suspended final AsyncResponse asyncResponse,
                           final String transferObject) ;

    @DELETE
    @Consumes("application/json")
    @Produces("application/json")
    @Path("delete/{id}")
    public String deleteREST(@PathParam("id") String id); 
}

我有一个实现这个接口(interface)的抽象类:

public abstract class BaseREST implements ICRUD{

private final ExecutorService executorService = Executors.newCachedThreadPool();

@Override
public String createREST(String transferObject) {
    return create(transferObject).toJson();
}

@Override
public String retreiveREST(@PathParam("id") String id) {
    return retreive(id).toJson();
}


@Override
public String deleteREST(
        @PathParam("id") String id) {
    return delete(id).toJson();
}

@Override
    public void updateREST(@Suspended final AsyncResponse asyncResponse, final String transferObject) {
        executorService.submit(new Runnable() {
            @Override
            public void run() {
                asyncResponse.resume(doUpdateREST(transferObject));
            }
        });
    }      

}

最后，我的实现类只是为资源提供了一个 PATH:

@Path("meeting")
public class MeetingRestServices extends BaseREST {
}

当我尝试访问我的资源时(假设上下文根是/):

http://localhost:8080/webresources/meeting/retreive/0

我得到一个 404，它说它找不到它。我的想法是，在继承的某个地方，它弄乱了我认为资源应该在哪里的路径。对此有什么想法吗？

编辑

webresources 定义如下。此类由 Netbeans 自动添加。

@javax.ws.rs.ApplicationPath("webresources")
public class ApplicationConfig extends Application {

    @Override
    public Set<Class<?>> getClasses() {
        Set<Class<?>> resources = new java.util.HashSet<>();
        addRestResourceClasses(resources);
        return resources;
    }

    /**
     * Do not modify addRestResourceClasses() method.
     * It is automatically populated with
     * all resources defined in the project.
     * If required, comment out calling this method in getClasses().
     */
    private void addRestResourceClasses(Set<Class<?>> resources) {
        resources.add(com.dv.meetmefor.ws.impl.BinaryDataRestService.class);
        resources.add(com.dv.meetmefor.ws.impl.ImageRestServices.class);
        resources.add(com.dv.meetmefor.ws.impl.LocaleRestService.class);
        resources.add(com.dv.meetmefor.ws.impl.MeetUpRestServices.class);
        resources.add(com.dv.meetmefor.ws.impl.MeetingRestServices.class);
        resources.add(com.dv.meetmefor.ws.impl.UserAccountRestServices.class);
    }

}

Answer 1

你上面描述的看起来不错。以下是 JAX-RS 继承规则，这些规则基于您提供的内容。

From JAX-RS spec §3.6:

JAX-RS annotations MAY be used on the methods and method parameters of a super-class or an implemented interface. Such annotations are inherited by a corresponding sub-class or implementation class method provided that method and its parameters do not have any JAX-RS annotations of its own. Annotations on a super-class take precedence over those on an implemented interface. If a subclass or implementation method has any JAX-RS annotations then all of the annotations on the super class or interface method are ignored. E.g.:

public interface ReadOnlyAtomFeed {
    @GET @Produces("application/atom+xml")
    Feed getFeed();
}

@Path("feed")
public class ActivityLog implements ReadOnlyAtomFeed {
    public Feed getFeed() {...}
}

在上面，ActivityLog.getFeed从接口(interface)继承了@GET和@Produces注解。反之:

@Path("feed")
public class ActivityLog implements ReadOnlyAtomFeed {
    @Produces("application/atom+xml")
    public Feed getFeed() {...}
}

在上面，ReadOnlyAtomFeed.getFeed上的@GET注解不是被ActivityLog继承的
.getFeed