工作中遇到这样的场景：某个方法需要在不同的业务场景下执行特定的逻辑，该方法已经上生产，不想改变原来的代码，因此决定用AOP做个切面执行逻辑。
以下为核心代码：
定义注解：
@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Inherited
@Documented
@Repeatable(value = StartTaskRuns.class)
public @interface StartTaskRun {
int businessType() default 0;
}
@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Inherited
@Documented
public @interface StartTaskRuns {
StartTaskRun[] value();
}
定义切面
@Aspect
@Component
public class StartTaskRunAspect {
@AfterReturning(pointcut = "@annotation(com.freedom.code.annotation.StartTaskRun)", returning = "retValue")
public void startTask(JoinPoint joinPoint, Object retValue) throws Exception {
Object[] args = joinPoint.getArgs();
Signature signature = joinPoint.getSignature();
MethodSignature methodSignature = (MethodSignature) signature;
Method method = methodSignature.getMethod();
StartTaskRun[] annotations = method.getAnnotationsByType(StartTaskRun.class);
for (StartTaskRun annotation : annotations) {
System.out.println(annotation.businessType());
}
}
}
业务代码加注解
@StartTaskRun(businessType = 5)
@StartTaskRun(businessType = 6)
@Override
@Transactional(rollbackFor = Exception.class)
public String doCsmsStrategy(Long id) {
// 业务逻辑
return userDO.getId().toString();
}
debug的时候发现，切面的代码没有执行。
@AfterReturning(pointcut = "execution(* com.freedom.code.service.UserServiceImpl.doCsmsStrategy(..))", returning = "retValue")
public void startTask(JoinPoint joinPoint, Object retValue) throws Exception {
Object[] args = joinPoint.getArgs();
Signature signature = joinPoint.getSignature();
MethodSignature methodSignature = (MethodSignature) signature;
Method method = methodSignature.getMethod();
StartTaskRun[] annotations = method.getAnnotationsByType(StartTaskRun.class);
for (StartTaskRun annotation : annotations) {
System.out.println(annotation.businessType());
}
}
还是不行，但是我的工程中其他地方也是类似的写法却没有问题啊。看起来不像是AOP配置不对的问题
打断点吧，如下：
是使用cglib生成的代理对象，没有问题啊，到底问题在哪里。没办法，面向百度编程吧，还真找到问题解决办法。如下帖子：https:
对于可重复注解，如果方法上用多个可重复注解，AOP拦截不到。需要用它的包装类型注解做切点，改成以下代码就可以了：
@Aspect
@Component
public class StartTaskRunAspect {
@AfterReturning(pointcut = "@annotation(com.freedom.code.annotation.StartTaskRun) || @annotation(com.freedom.code.annotation.StartTaskRuns)", returning = "retValue")
public void startTask(JoinPoint joinPoint, Object retValue) throws Exception {
Object[] args = joinPoint.getArgs();
Signature signature = joinPoint.getSignature();
MethodSignature methodSignature = (MethodSignature) signature;
Method method = methodSignature.getMethod();
StartTaskRun[] annotations = method.getAnnotationsByType(StartTaskRun.class);
for (StartTaskRun annotation : annotations) {
System.out.println(annotation.businessType());
}
}
}
