简介
咱们在文章《Spring AOP与AspectJ的比照及利用》介绍了AOP的应用，这篇文章解说一下AOP与注解的整合，通过注解来应用AOP，会十分不便。为了简便，咱们还是来实现一个计时的性能。
整合过程
首先创立一个注解：
@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.METHOD)public @interface PkslowLogTime {}而后在一个Service中应用注解：
@Service@Slf4jpublic class TestService { @PkslowLogTime public void fetchData() { log.info("fetchData"); try { Thread.sleep(500); } catch (InterruptedException e) { throw new RuntimeException(e); } }}这个Service的办法会在Controller中调用：
@GetMapping("/hello")public String hello() { log.info("------hello() start---"); test(); staticTest(); testService.fetchData(); log.info("------hello() end---"); return "Hello, pkslow.";}接着是要害一步，咱们要实现切面，来找到注解并实现对应性能：
@Aspect@Component@Slf4jpublic class PkslowLogTimeAspect { @Around("@annotation(com.pkslow.springboot.aop.PkslowLogTime) && execution(* *(..))") public Object doAround(ProceedingJoinPoint joinPoint) throws Throwable { log.info("------PkslowLogTime doAround start------"); MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature(); // Get intercepted method details String className = methodSignature.getDeclaringType().getSimpleName(); String methodName = methodSignature.getName(); // Measure method execution time StopWatch stopWatch = new StopWatch(className + "->" + methodName); stopWatch.start(methodName); Object result = joinPoint.proceed(); stopWatch.stop(); // Log method execution time log.info(stopWatch.prettyPrint()); log.info("------PkslowLogTime doAround end------"); return result; }}@Around("@annotation(com.pkslow.springboot.aop.PkslowLogTime) && execution(* *(..))")这个表达式很要害，如果不对，将无奈正确辨认；还有可能呈现屡次调用的状况。屡次调用的状况能够参考：Stackoverflow
这里应用了Spring的StopWatch来计时。
测试
通过maven build包：
$ mvn clean package日志能够看到有对应的织入信息：
[INFO] Join point 'method-execution(java.lang.String com.pkslow.springboot.controller.TestController.hello())' in Type 'com.pkslow.springboot.controller.TestController' (TestController.java:22) advised by around advice from 'com.pkslow.springboot.aop.ControllerAspect' (ControllerAspect.class(from ControllerAspect.java))[INFO] Join point 'method-execution(java.lang.String com.pkslow.springboot.controller.TestController.hello())' in Type 'com.pkslow.springboot.controller.TestController' (TestController.java:22) advised by before advice from 'com.pkslow.springboot.aop.ControllerAspect' (ControllerAspect.class(from ControllerAspect.java))[INFO] Join point 'method-execution(void com.pkslow.springboot.controller.TestController.test())' in Type 'com.pkslow.springboot.controller.TestController' (TestController.java:31) advised by around advice from 'com.pkslow.springboot.aop.ControllerAspect' (ControllerAspect.class(from ControllerAspect.java))[INFO] Join point 'method-execution(void com.pkslow.springboot.controller.TestController.test())' in Type 'com.pkslow.springboot.controller.TestController' (TestController.java:31) advised by before advice from 'com.pkslow.springboot.aop.ControllerAspect' (ControllerAspect.class(from ControllerAspect.java))[INFO] Join point 'method-execution(void com.pkslow.springboot.controller.TestController.staticTest())' in Type 'com.pkslow.springboot.controller.TestController' (TestController.java:37) advised by around advice from 'com.pkslow.springboot.aop.ControllerAspect' (ControllerAspect.class(from ControllerAspect.java))[INFO] Join point 'method-execution(void com.pkslow.springboot.controller.TestController.staticTest())' in Type 'com.pkslow.springboot.controller.TestController' (TestController.java:37) advised by before advice from 'com.pkslow.springboot.aop.ControllerAspect' (ControllerAspect.class(from ControllerAspect.java))[INFO] Join point 'method-execution(void com.pkslow.springboot.service.TestService.fetchData())' in Type 'com.pkslow.springboot.service.TestService' (TestService.java:12) advised by around advice from 'com.pkslow.springboot.aop.PkslowLogTimeAspect' (PkslowLogTimeAspect.class(from PkslowLogTimeAspect.java))启动利用后拜访接口，日志如下：
总结
通过注解能够实现很多性能，也十分不便。而且注解还能够增加参数，组合应用更完满了。
代码请看GitHub: https://github.com/LarryDpk/p...