如何在 jax-rs 的 ContainerRequestFilter 中获取资源方法注解

Question

我编写了一个类扩展 ContainerRequestFilter 以进行权限检查。如何获取匹配方法的注释以进行权限检查。

@javax.ws.rs.ext.Provider
public class AuthorizationRequestFilter implements ContainerRequestFilter {
    public void filter(ContainerRequestContext requestContext) throws IOException {
    // how can I get resources' methods' annotation here? 
    // from the resource below , I want to checkout whether the target matched method contains the @ReadPermission annotation
    }
}

@Path("/region")
public class Region {
   @POST
   @Path("/{region_id}")
   @Produces({MediaType.APPLICATION_JSON , MediaType.APPLICATION_XML})
   @ReadPermission
   public String getRegion() {
      return null;
   }
}

Answer 1

您可以使用以下代码（CXF 专用）：

 public class AuthorizationRequestFilter implements ContainerRequestFilter {
    public void filter(ContainerRequestContext requestContext) throws IOException {

        Message message = JAXRSUtils.getCurrentMessage();
        OperationResourceInfo operation = message.getExchange().get(OperationResourceInfo.class);
        Method m = operation.getMethodToInvoke();
        boolean hasAnnotation =  m.getAnnotation(ReadPermission.class) != null;
    }
}

或者这个（JAX-RS的通用）

@Provider
public class AuthorizationRequestFilter implements ContainerRequestFilter {

    @Context
    private ResourceInfo resourceInfo;

    @Override
    public void filter(final ContainerRequestContext requestContext) throws IOException {
        resourceInfo.getResourceMethod().getAnnotation(ReadPermission.class);
    }
}