关于后端:Springboot整合AOP和注解实现丰富的切面功能

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
@Slf4j
public 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
@Slf4j
public 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…