如何在泽西岛列出所有已注册的JAX-RS实体提供商 [英] How to list all registered JAX-RS Entity Providers in Jersey

问题描述

让我们假设我有一个带嵌入式码头的简单球衣应用 github上的演示项目和下面的基本代码。

Let's suppose i have simple jersey app with embedded jetty Demo project on github and essential code below.

回到jersey1的日子我有日志信息：

Back in the days with jersey1 i had log messages:

мая 07, 2016 5:05:50 AM com.sun.jersey.api.core.PackagesResourceConfig init
INFO: Scanning for root resource and provider classes in the packages:
  ru.varren
мая 07, 2016 5:05:50 AM com.sun.jersey.api.core.ScanningResourceConfig logClasses
INFO: Root resource classes found:
  class ru.varren.MyResource
мая 07, 2016 5:05:50 AM com.sun.jersey.api.core.ScanningResourceConfig logClasses
INFO: Provider classes found:
  class ru.varren.JsonProvider
мая 07, 2016 5:05:50 AM com.sun.jersey.server.impl.application.WebApplicationImpl _initiate
INFO: Initiating Jersey application, version 'Jersey: 1.19.1 03/11/2016 02:08 PM'

但是现在我正在尝试使用jersey2而且thiere不再是日志信息。所以，我的问题是如何列出所有已注册的JAX-RS实体提供商。我不在乎在哪里列出它们。在 main 函数或某些 @GET MyResource 方法中。可能我应该在我的设置中更改一些东西或者放置logger boolean，但是找不到它。

But now i am trying to work with jersey2 and thiere is no more log info. So, my question is how to list all registered JAX-RS Entity Providers. I don't care much where to list them. In main function or in some @GET MyResource method. Probably i should change something in my setup or put logger boolean, but cant find it.

这纯粹是出于测试目的。所有提供者类的简单打印对我来说已经足够了。更酷的选择是打印提供商和已经合并的 @Produces 和 @Consumes MediaType。

This is purely for testing purpose. Simple print of all providers classes will be enough for me. Cooler option is to print provider and accosiated @Produces and @Consumes MediaType.

MyResource.java

@Path("test")
public class MyResource {

    @GET
    @Produces({ MediaType.APPLICATION_JSON })
    public Response  getPersons() {
        return Response.ok("[some data here]").build();
    }

}

MyApplication.java

public class MyApplication {

    public static void main(String[] args) throws Exception {
        URI baseUri = UriBuilder.fromUri("http://localhost/").port(9998).build();
        ResourceConfig config = new ResourceConfig(MyResource.class);
        config.packages("ru.varren");
        Server server = JettyHttpContainerFactory.createServer(baseUri, config, true);
        server.join();
    }

}

gradle.build

dependencies {  
    compile 'org.glassfish.jersey.containers:jersey-container-servlet:2.22.2'
    compile 'org.glassfish.jersey.containers:jersey-container-servlet-core:2.22.2'
    compile 'org.glassfish.jersey.media:jersey-media-json-jackson:2.22.2'
    compile 'org.glassfish.jersey.containers:jersey-container-jetty-http:2.22.2'

    compile 'org.eclipse.jetty:jetty-server:9.1.0.M0'
    compile 'org.eclipse.jetty:jetty-servlet:9.1.0.M0'
}

推荐答案

您可以使用 ApplicationEventListener ，并且在 INITIAILZATION_FINISHED 上，您可以获得来自 ApplicationEvent 。例如

You can use an ApplicationEventListener, and on INITIAILZATION_FINISHED, you can get a set of resources and providers from the ApplicationEvent. For example

@Provider
public class ProviderLoggingListener implements ApplicationEventListener {

    @Override
    public void onEvent(ApplicationEvent event) {
        switch (event.getType()) {
            case INITIALIZATION_FINISHED: {
                Set<Class<?>> providers = event.getProviders();
                ResourceConfig immutableConfig = event.getResourceConfig();
                ResourceModel resourcesModel = event.getResourceModel();
                break;
            }
        }
    }

    @Override
    public RequestEventListener onRequest(RequestEvent requestEvent) {
        return null;
    }
}

另见：

• 列出所有已部署的休息端点（spring-boot ，泽西岛），其中显示了遍历 ResourceModel

• Listing all deployed rest endpoints (spring-boot, jersey), which shows an example of traversing the ResourceModel

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