Spring AOP用于接口及其带注释的方法

Question

@Component
public class MyService implements com.xyz.WithSession {

    public void someMethodWhichDoesNotNeedAutorization() {
        // code S1
    }

    @com.xyz.WithAuthorization
    public void someMethodWhichNeedAutorization() {
        // code S2
    }
}

@Aspect
public class MyAspect {

    @Before("target(com.xyz.WithSession)")
    public void adviceBeforeEveryMethodFromClassImplementingWithSession() {
        // code A1
    }

    @Before("target(com.xyz.WithSession) && @annotation(com.xyz.WithAuthorization)")
    public void adviceBeforeWithAuthorizationMethodFromClassImplementingWithSession() {
        // code A2
    }

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface WithAuthorization{
}

null

代码是用Java7和Spring3.1.3编写的。

我试过另一种方法。我使用“around”建议而不是“before”和“after”来访问ProcedingJoinPoint。在这个建议中，我通过反射检查方法是否具有注释'com.xyz.WithAuthorization'：

private boolean isAnnotated(ProceedingJoinPoint proceedingJoinPoint) {
    MethodSignature signature = (MethodSignature) proceedingJoinPoint.getSignature();
    return signature.getMethod().isAnnotationPresent(com.xyz.WithAuthorization);
}

我的批注有'@retentionpolicy.runtime)，但我在调试器中看到，在运行时，方法签名中缺少批注。所以问题仍然存在。

Answer 1

在Spring中，请参阅此链接

例如在Spring参考资料中

@Before("com.xyz.lib.Pointcuts.anyPublicMethod() && @annotation(auditable)")
public void audit(Auditable auditable) {
    AuditCode code = auditable.value();
    // ...
}

AccountService接口定义的任何方法的执行：

execution(* com.xyz.service.AccountService.*(..))

@annotation(org.springframework.transaction.annotation.Transactional)

@Before("execution(* com.xyz.WithSession.*(..)) && @annotation(authorization)")
public void adviceBeforeWithAuthorizationMethodFromClassImplementingWithSession(WithAuthorization authorization) {
    // code A2
}