AspectJ-检索带注释的参数列表

Question

所以目前，这是我所做的（不起作用）：

@Before("execution (* org.xx.xx.xx..*.*(@org.xx.xx.xx.xx.xx.Standardized (*),..))")
public void standardize(JoinPoint jp) throws Throwable {
    Object[] myArgs = jp.getArgs();
    getLogger().info("Here: arg length=" + myArgs.length);
    // Roll on join point arguments
    for (Object myParam : myArgs) {

        getLogger().info(
                    "In argument with " + myParam.getClass().getAnnotations().length
                                + " declaread annotations");
        getLogger().info("Class name is " + myParam.getClass().getName());
        // Get only the one matching the expected @Standardized annotation
        if (myParam.getClass().getAnnotation(Standardized.class) != null) {
            getLogger().info("Found parameter annotated with @Standardized");
            standardizeData(myParam.getClass().getAnnotation(Standardized.class), myParam);
        }
    }
}

这是与建议匹配的代码：

public boolean insertLog(@Standardized(type = StandardizedData.CLIPON) CliponStat theStat) {
    // ...
}

以及由junit测试生成的跟踪：

INFO: ICI: arg lenght=1
INFO: In argument with 0 declaread annotations

Answer 1

我希望我理解对了你。

myparam.getClass().getAnnotations()为您提供类的注释。类似于：

@Standardized(type = StandardizedData.CLIPON)
public class Main{...}

也许这个切入点/建议对你有帮助：

@Before("execution (* org.xx.xx.xx..*.*(@org.xx.xx.xx.xx.xx.Standardized (*),..))")
public void standardize(JoinPoint jp) throws Throwable {
    Object[] args = jp.getArgs();
    MethodSignature ms = (MethodSignature) jp.getSignature();
    Method m = ms.getMethod();

    Annotation[][] parameterAnnotations = m.getParameterAnnotations();

    for (int i = 0; i < parameterAnnotations.length; i++) {
        Annotation[] annotations = parameterAnnotations[i];
        System.out.println("I am checking parameter: " + args[i]);
        for (Annotation annotation : annotations) {
            System.out.println(annotation);

            if (annotation.annotationType() == Standardized.class) {
                System.out.println("we have a Standardized Parameter with type = "
                        + ((Standardized) annotation).type());
            }
        }
    }
}

I am checking parameter:  main.CliponStat@331f2ee1 
@annotation.Standardized(type=CLIPON)
we have a Standardized Parameter with type = CLIPON