java - Jersey JAX-RS 实例注入(inject)

Question

我正在尝试将资源实例注入(inject)到具有 Singleton 作用域的 JAX-RS 应用程序中，但是当我这样做时，我得到:

WARNING: A provider com.test.jersey.app.MyResource registered in SERVER runtime does not implement any provider interfaces applicable in the SERVER runtime. Due to constraint configuration problems the provider com.test.jersey.app.MyResource will be ignored.

我有一个如下的应用程序，它需要一个已经运行的 MyResource 实例:

public class MyApp extends ResourceConfig {
  public MyApp(MyResource res) {
    super(
        MyService.class
        );
    registerInstances(res);
  }
}

和

public class MyResource {
  String instanceVar;

  public MyResource(String test) {
    instanceVar = test;
  }

  public String getString() {
    return instanceVar;
  }
}

有服务:

@Path("/service")
public class MyService {
  @GET
  @Path("")
  public String get(@Context MyResource res) {
    String output;
    if (res != null) {
      output = res.getString();
    } else {
      output = "NOT SET";
    }
    return "output: " + output;
  }
}

这正在使用以下运行:

public static void main(String[] args) {
  MyResource resource = new MyResource("foo");
  MyApp restApp = new MyApp(resource);
  ServletHolder servlet = new ServletHolder(new ServletContainer(restApp));
  Server jettyServer = new Server(8080);
  ServletContextHandler context = new ServletContextHandler(jettyServer, "/*");
  context.addServlet(servlet, "/*");
  try {
    jettyServer.start();
    jettyServer.join();
  } catch (Exception e) {
    e.printStackTrace();
  } finally {
    jettyServer.destroy();
  }
}

我尝试使用 AbstractBinder，但找不到将 MyResource 的实例绑定(bind)到服务的方法。

依赖关系:

<dependencies>
    <dependency>
        <groupId>org.glassfish.jersey.core</groupId>
        <artifactId>jersey-server</artifactId>
        <version>2.23.2</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-servlet-core</artifactId>
        <version>2.23.2</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-jetty-http</artifactId>
        <version>2.23.2</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-json-jackson</artifactId>
        <version>2.23.2</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-servlet</artifactId>
        <version>9.2.19.v20160908</version>
    </dependency>
    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-util</artifactId>
        <version>9.2.19.v20160908</version>
    </dependency>
    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-server</artifactId>
        <version>9.2.19.v20160908</version>
    </dependency>
    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-jmx</artifactId>
        <version>9.2.19.v20160908</version>
    </dependency>
    <dependency>
        <groupId>javax.ws.rs</groupId>
        <artifactId>javax.ws.rs-api</artifactId>
        <version>2.0</version>
    </dependency>
</dependencies>

Answer 1

使用DI系统使其可注入(inject)

final MyResource resource = new MyResource(...);
final AbstractBinder binder = new AbstractBinder() {
    @Override
    public void configure() {
        bind(resource).to(MyResource.class);
    }
};
final MyApp app = new MyApp();
app.register(binder);

另请参阅:

• Dependency injection with Jersey 2.0