CDI与泽西岛和Tomcat7 - 拦截器永远不会被调用

Question

我想与Jersy abd Tomcat 7一起工作的CDI拦截器。但它从来没有工作。有人可以帮帮我吗。

我有点尝试由泽西提供的例子进行一些小的修改。

这是我的代码。有趣的是，我可以在输出中看到消息“Injected .....”，意味着@PostConstruct注释正在工作。在WEB-INF

<beans> 
    <interceptors> 
     <class>org.glassfish.jersey.examples.cdi.resources.LoggedInterceptor</class> 
    </interceptors> 


<beans/> 

Logged.java

的pom.xml

<dependencies> 
      <dependency> 
       <groupId>javax.ws.rs</groupId> 
       <artifactId>javax.ws.rs-api</artifactId> 
       <version>2.0</version> 
      </dependency> 
      <dependency> 
       <groupId>javax.annotation</groupId> 
       <artifactId>javax.annotation-api</artifactId> 
       <version>1.2</version> 
      </dependency> 
      <dependency> 
       <groupId>javax.enterprise</groupId> 
       <artifactId>cdi-api</artifactId> 
       <version>1.2</version> 
      </dependency> 
      <dependency> <!-- this is to avoid Jersey jars to be bundled with the WAR --> 
       <groupId>org.glassfish.jersey.containers</groupId> 
       <artifactId>jersey-container-servlet-core</artifactId> 
       <version>2.13</version> 
      <!-- <scope>provided</scope> --> 
      </dependency> 
      <dependency> 
     <groupId>org.glassfish.jersey.containers.glassfish</groupId> 
     <artifactId>jersey-gf-cdi</artifactId> 
     <version>2.13</version> 
    </dependency> 
     </dependencies> 

的beans.xml

import java.lang.annotation.ElementType; 
import java.lang.annotation.Retention; 
import java.lang.annotation.RetentionPolicy; 
import java.lang.annotation.Target; 

import javax.interceptor.InterceptorBinding; 
@InterceptorBinding 
@Retention(RetentionPolicy.RUNTIME) 
@Target({ElementType.METHOD, ElementType.TYPE}) 
public @interface Logged { 

} 

LoggedInterceptor.java

import java.io.Serializable; 
import javax.interceptor.AroundInvoke; 
import javax.interceptor.Interceptor; 
import javax.interceptor.InvocationContext; 


@Interceptor 
@Logged 

public class LoggedInterceptor implements Serializable { 

    public LoggedInterceptor() { 
     System.out.println("Invoked...."); 
    } 

    @AroundInvoke 
    public Object logMethodEntry(InvocationContext invocationContext) 
      throws Exception { 
     System.out.println("Entering method: " 
       + invocationContext.getMethod().getName() + " in class " 
       + invocationContext.getMethod().getDeclaringClass().getName()); 

     return invocationContext.proceed(); 
    } 
} 

LoggedInterceptorTest.java

public class LoggedInterceptorTest { 


    @Logged 
    public void testLoggedInterceptor() { 
     System.out.println("Called..."); 
    } 

    public static void main(String[] args) { 
     LoggedInterceptorTest l = new LoggedInterceptorTest(); 
     l.testLoggedInterceptor(); 
    } 
} 

服务 EchoParamFieldResource.java

import javax.ws.rs.GET; 
import javax.ws.rs.Produces; 
import javax.ws.rs.Path; 
import javax.ws.rs.PathParam; 
import javax.ws.rs.QueryParam; 
import javax.annotation.ManagedBean; 
import javax.annotation.PostConstruct; 


@ManagedBean 
@Path("echofield/{b}") 
public class EchoParamFieldResource { 

    @PathParam("b") String bInjected; 

    String b; 

    /** 
    * Ensure we got path parameter value injected. 
    */ 
    @PostConstruct 
    @SuppressWarnings("unused") 
    private void postConstruct() { 
     if (bInjected == null) { 
      throw new IllegalStateException("Field b has not been injected!"); 
     } 
     b = bInjected; 
     System.out.println("Injected....."); 
     LoggedInterceptorTest l = new LoggedInterceptorTest(); 
     l.testLoggedInterceptor(); 
    } 

    /** 
    * Return a string containing injected values. 
    * 
    * @param a value of a query parameter a. 
    * @return message containing injected values. 
    */ 
    @GET 
    @Produces("text/plain") 
    public String get(@QueryParam("a") String a) { 
     return String.format("ECHO %s %s", a, b); 
    } 
} 

Answer 1

你很可能只使用一个Tomcat，而不是一个TomEE。只有TomEE支持CDI。

@PathParam（“b”）注入由Jersey提供，而不是CDI。拦截器是CDI的一部分。

为了被拦截，班级应由CDI管理。因此，而不是类实例化这样的：

LoggedInterceptorTest l = new LoggedInterceptorTest(); // CDI does not work! 

你应该把它注射：

​​

而且你可以检查是否l == null，而这将是CDI检查。