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This article introduces the relevant knowledge of "how to realize the section of annotations in springboot". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The case of realizing the section of the annotation:

(1) define an annotation @ Target (ElementType.METHOD) @ Retention (RetentionPolicy.RUNTIME) public @ interface MyAnnotation {String getValues () default "test annotation";} @ Target (ElementType.METHOD)

Indicates that the annotation acts on the method (type for class, field for member variables)

@ Retention (RetentionPolicy.RUNTIME)

Indicates the scope of the annotation, which needs to be recognized at run time, so it is RUNTIME (SOURCE means at the source level, that is, the annotation is not visible when compiled to .class, while CLASS can, but not at runtime)

(2) compiling the section of the annotation

(only record the execution time and printing method, you can implement other logic)

@ Aspect@Component@Slf4jpublic class MyAspect {/ / value can also be written as value = "(execution (* com.sj..* (..)) & & @ annotation (zkDistributeLock)" @ Around (value = "@ annotation (myAnnotation)", argNames = "proceedingJoinPoint, myAnnotation") public Object processTest (ProceedingJoinPoint proceedingJoinPoint, MyAnnotation myAnnotation) throws Throwable {long beginTime = System.currentTimeMillis (); / / get the method parameter Object [] args = proceedingJoinPoint.getArgs () / / execution method Object res = proceedingJoinPoint.proceed (args); long time = System.currentTimeMillis ()-beginTime; MethodSignature signature = (MethodSignature) proceedingJoinPoint.getSignature (); String className = proceedingJoinPoint.getTarget (). GetClass (). GetName (); String methodName = signature.getName (); log.info ("values on comments: {}", myAnnotation.getValues ()) Log.info ("execution time: {}", time); log.info ("execution classes and methods: {} {}", className, methodName); return res;}} (3) Test @ GetMapping ("/ go") @ MyAnnotation (getValues = "success") public String test1 () {return "hello world";}

Execution result:

Value on the note: success

Execution time: 8

Execute classes and methods: com.***.TestController test1

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