1. 问题背景
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。
2. 不啰嗦,上代码
以下为核心代码:
定义注解:
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@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();
}
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定义切面
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@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());
}
}
}
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业务代码加注解
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@StartTaskRun (businessType = 5 )
@StartTaskRun (businessType = 6 )
@Override
@Transactional (rollbackFor = Exception. class )
public String doCsmsStrategy(Long id) {
// 业务逻辑
return userDO.getId().toString();
}
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debug的时候发现,切面的代码没有执行。
3. 问题排查
3.1 是不是切点写得有问题,于是换成如下形式:
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@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());
}
}
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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
3.2 是不是使用的地方不是代理对象
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:http://www.zzvips.com/article/209596.html
4. 问题原因
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:
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@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());
}
}
}
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原文链接:https://blog.csdn.net/qq_39530821/article/details/119900335