Question

我已成功实现了目标PARAMETER的自定义注入注释。我不明白我是如何制作注释支持目标METHOD的呢？

以下是我的示例代码：

Hello注释：

@Retention(RUNTIME)
@Target({METHOD, PARAMETER})
public @interface Hello {
}

Hello注释解析器：

@Singleton
public class HelloResolver {
    public static class HelloInjectionResolver extends ParamInjectionResolver<Hello> {
        public HelloInjectionResolver() {
            super(HelloValueFactoryProvider.class);
        }
    }

    @Singleton
    public static class HelloValueFactoryProvider extends AbstractValueFactoryProvider {
        @Inject
        public HelloValueFactoryProvider(final MultivaluedParameterExtractorProvider extractorProvider,
                                         final ServiceLocator injector) {
            super(extractorProvider, injector, UNKNOWN);
        }

        @Override
        protected Factory<?> createValueFactory(final Parameter parameter) {
            if (!String.class.equals(parameter.getRawType())) return null;
            if (parameter.getAnnotation(Hello.class) == null) return null;
            return new AbstractContainerRequestValueFactory<String>() {
                @Override
                public String provide() {
                    final DateTime now = DateTime.now();
                    if (22 < now.getHourOfDay() || now.getHourOfDay() < 6) {
                        throw new WebApplicationException(FORBIDDEN);
                    } else {
                        return format("Hello, it is %s o'clock so I am awake! :)", forPattern("HH:mm").print(now));
                    }
                }
            };
        }
    }

    public static class Binder extends AbstractBinder {
        @Override
        protected void configure() {
            bind(HelloValueFactoryProvider.class).to(ValueFactoryProvider.class).in(Singleton.class);
            bind(HelloInjectionResolver.class).to(
                    new TypeLiteral<InjectionResolver<Hello>>() {
                    }
            ).in(Singleton.class);
        }
    }
}

Hello资源：

@Path("hello")
public class HelloResource {
    @GET
    @Path("method")
    @Produces(APPLICATION_JSON)
    @Hello
    public String method() {
        return "Hello!";
    }

    @GET
    @Path("param")
    @Produces(APPLICATION_JSON)
    public String param(@Hello final String hello) {
        return hello;
    }
}

当我点击

http://localhost:8080/hello/method

我得到你好！如果小时在禁止的时间间隔内，则返回。

Answer 1

我不确定这会有效，但你可以试试这个：

public static class HelloInjectionResolver extends ParamInjectionResolver<Hello> {
    public HelloInjectionResolver() {
        super(HelloValueFactoryProvider.class);
    }

    public boolean isMethodParameterIndicator() {
        return true;
    } 
}

警告：我自己没有尝试过，但理论上应该允许你的解析器作为方法中的参数。

针对Jersey 2中的METHOD和PARAMETER的自定义注释

1 个答案: