JAX-RS Jersey，如何向应用程序动态添加资源或提供程序 [英] JAX-RS Jersey, how to dynamic adding resources or providers to Application

问题描述

public class ShoppingApplication extends Application {

  private Set<Object> singletons = new HashSet<>();
  private Set<Class<?>> classes = new HashSet<>();

  public ShoppingApplication() {
    classes.add(CustomerResourceService.class);
    classes.add(JAXBMarshaller.class);
    classes.add(JSONMarshaller.class);
    singletons.add(new CustomerResourceService());
  }

  @Override
  public Set<Class<?>> getClasses() {
    return classes;
  }

  @Override
  public Set<Object> getSingletons() {
    return singletons;
  } 
}

假设我有上面的代码，该代码扩展了Application并注册了要设置的资源或提供程序.我想知道如何动态地在运行时注入资源以进行设置，我的Web应用程序将在运行时创建多个新资源，并且需要注入到应用程序中才能使用.

解决方案

用于构建资源的程序化API

Resource 类是您想要的.只需注意这是针对Jersey的API.

根据文档， @Path("hello") public class HelloResource { @GET @Produces("text/plain") public String sayHello() { return "Hello!"; } }

 // Register the annotated resource.
ResourceConfig resourceConfig = new ResourceConfig(HelloResource.class);

// Add new "hello2" resource using the annotated resource class
// and overriding the resource path.
Resource.Builder resourceBuilder =
        Resource.builder(HelloResource.class, new LinkedList<ResourceModelIssue>())
        .path("hello2");

// Add a new (virtual) sub-resource method to the "hello2" resource.
resourceBuilder.addChildResource("world")
        .addMethod("GET")
        .produces("text/plain")
        .handledBy(new Inflector<Request, String>() {

                @Override
                public String apply(Request request) {
                    return "Hello World!";
                }
        });

// Register the new programmatic resource in the application's configuration.
resourceConfig.registerResources(resourceBuilder.build());
 

下表说明了上例中配置的应用程序支持的请求和提供的响应:

   Request              |  Response        |  Method invoked
-----------------------+------------------+----------------------------
   GET /hello          |  "Hello!"        |  HelloResource.sayHello()
   GET /hello2         |  "Hello!"        |  HelloResource.sayHello()
   GET /hello2/world   |  "Hello World!"  |  Inflector.apply()
 

有关其他详细信息，请参阅 Jersey文档.

>

public class ShoppingApplication extends Application {

  private Set<Object> singletons = new HashSet<>();
  private Set<Class<?>> classes = new HashSet<>();

  public ShoppingApplication() {
    classes.add(CustomerResourceService.class);
    classes.add(JAXBMarshaller.class);
    classes.add(JSONMarshaller.class);
    singletons.add(new CustomerResourceService());
  }

  @Override
  public Set<Class<?>> getClasses() {
    return classes;
  }

  @Override
  public Set<Object> getSingletons() {
    return singletons;
  } 
}

Suppose I have above code which I extends Application and register my resources or providers to set. I want to know how can I dynamically inject my resources to set in runtime, my web application will create several new resources in runtime and need to inject to Application inorder to use.

解决方案

Programmatic API for building resources

The Resource class is what your are looking for. Just mind it's a Jersey specific API.

According to the documentation, the Resource class is the main entry point to the programmatic resource modeling API that provides ability to programmatically extend the existing JAX-RS annotated resource classes or build new resource models that may be utilized by Jersey runtime.

Have a look at the example provided by the documentation:

@Path("hello")
public class HelloResource {

     @GET
     @Produces("text/plain")
     public String sayHello() {
         return "Hello!";
     }
}

// Register the annotated resource.
ResourceConfig resourceConfig = new ResourceConfig(HelloResource.class);

// Add new "hello2" resource using the annotated resource class
// and overriding the resource path.
Resource.Builder resourceBuilder =
        Resource.builder(HelloResource.class, new LinkedList<ResourceModelIssue>())
        .path("hello2");

// Add a new (virtual) sub-resource method to the "hello2" resource.
resourceBuilder.addChildResource("world")
        .addMethod("GET")
        .produces("text/plain")
        .handledBy(new Inflector<Request, String>() {

                @Override
                public String apply(Request request) {
                    return "Hello World!";
                }
        });

// Register the new programmatic resource in the application's configuration.
resourceConfig.registerResources(resourceBuilder.build());

The following table illustrates the supported requests and provided responses for the application configured in the example above:

  Request              |  Response        |  Method invoked
-----------------------+------------------+----------------------------
   GET /hello          |  "Hello!"        |  HelloResource.sayHello()
   GET /hello2         |  "Hello!"        |  HelloResource.sayHello()
   GET /hello2/world   |  "Hello World!"  |  Inflector.apply()

For additional details, check the Jersey documentation.

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