Spring 3.2 AOP - 通过注释拦截方法

Question

我试图拦截任何带有自定义注释标记的方法,你读这个的原因是因为我无法让它工作.我一直在关注简单的例子,但无法让它发挥作用.

这是我的代码.

MyAnnotation.java:

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface MyAnnotation {
  String value() default "";
  String key() default "";
  String condition() default "";
}

MyAspect.java:

@Aspect
public class MyAspect {

  @Pointcut(value="execution(public * *(..))")
  public void anyPublicMethod() { }

  @Around("anyPublicMethod() && @annotation(myAnnotation)")
  public Object process(ProceedingJoinPoint jointPoint, MyAnnotation myAnnotation) throws Throwable {
    System.out.println("In AOP process");
    return 5; //jointPoint.proceed();
  }
}

春天-config.xml文件:

<beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:mvc="http://www.springframework.org/schema/mvc"
           xmlns:c="http://www.springframework.org/schema/c"
           xmlns:context="http://www.springframework.org/schema/context"
           xmlns:tx="http://www.springframework.org/schema/tx"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns:aop="http://www.springframework.org/schema/aop"
           xmlns:p="http://www.springframework.org/schema/p"
           xmlns:cache="http://www.springframework.org/schema/cache"
           xmlns:task="http://www.springframework.org/schema/task"
           xsi:schemaLocation="
           http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
           http://www.springframework.org/schema/mvc
           http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-3.2.xsd
           http://www.springframework.org/schema/tx
           http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
           http://www.springframework.org/schema/aop 
           http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
           http://www.springframework.org/schema/cache 
           http://www.springframework.org/schema/cache/spring-cache-3.2.xsd
           http://www.springframework.org/schema/task
           http://www.springframework.org/schema/task/spring-task-3.2.xsd">


    ...

  <context:component-scan base-package="com.myapp">
    <context:include-filter type="annotation" expression="org.aspectj.lang.annotation.Aspect"/>
  </context:component-scan>


  <aop:aspectj-autoproxy proxy-target-class="true" />
  <bean id="myAspect" class="com.myapp.annotation.MyAspect" />

    ...

MyComponent.java:

@Component
public class MyComponent {
  @MyAnnotation(value="valtest", key="keytest", condition="contest")
  public int add(int i, int j) {
    System.out.println("Executing annotation.add");
    return i+j;
  }
}

测试代码:

final MyComponent m = new MyComponent();
assertTrue(5 == m.add(0, 1)); // Here m.add(...) always returns 1 instead of 5.

作为旁注,我试图用许多不同的方式定义我的切入点,所有方法都使用和不使用anyPublic()方法及其执行切入点,但这些方法都不适用于我:

1. @Around("@annotation(com.myapp.annotation.MyAnnotation)") public Object process(ProceedingJoinPoint jointPoint) throws Throwable { .. }

2. @Around(value="@annotation(myAnnotation)", argNames="myAnnotation") public Object process(ProceedingJoinPoint jointPoint, MyAnnotation myAnnotation) throws Throwable { .. }

3. @Around("execution(* com.myapp.*.*(..)) && @annotation(com.myapp.annotation.MyAnnotation)") public Object process(ProceedingJoinPoint jointPoint) throws Throwable { .. }

我究竟做错了什么？

Answer 1

在您的测试代码中,您不允许Spring创建您的MyComponent,而是使用new运算符.你应该MyComponent从Spring 访问ApplicationContext.

public class SomeTest {
    public static void main(String[] args) throws Exception {
        final ApplicationContext appContext = new ClassPathXmlApplicationContext("spring-config.xml");
        final MyComponent myComponent = appContext.getBean(MyComponent.class);
        //your test here...
    }
}

如果你没有从Spring获得你的组件,你如何期望它被代理？