Java自定义注解计算方法执行时间

叁歲伎倆 2022-03-01 04:12 1440阅读 0赞

1.自定义注解

package com.example.demotest.annotation;
    
    import java.lang.annotation.ElementType;
    import java.lang.annotation.Retention;
    import java.lang.annotation.RetentionPolicy;
    import java.lang.annotation.Target;
    
    @Target({ElementType.METHOD})
    @Retention(RetentionPolicy.RUNTIME)
    public @interface HandlingTime {
    
    }

2.配置切面类

package com.example.demotest.annotation.aspect;
    
    import org.aspectj.lang.ProceedingJoinPoint;
    import org.aspectj.lang.annotation.Around;
    import org.aspectj.lang.annotation.Aspect;
    import org.aspectj.lang.annotation.Pointcut;
    import org.springframework.stereotype.Component;
    
    @Aspect
    @Component
    public class HandlingTimeAspect {
    
        @Pointcut("@annotation(com.example.demotest.annotation.HandlingTime)")
        public void handlingTimePointcut() {}
    
        @Around("handlingTimePointcut()")
        public Object handlingTimeAround(ProceedingJoinPoint joinPoint){
            try {
                long startTime = System.currentTimeMillis();
                Object proceed = joinPoint.proceed();
                System.out.println(proceed);
                System.out.println("方法执行时间：" + (System.currentTimeMillis() - startTime));
                return proceed;
            } catch (Throwable throwable) {
                throwable.printStackTrace();
            }
            return null;
        }
    }

3.在需要切面的方法加上自定义注解

@HandlingTime
        @RequestMapping("www")
        public String www(String q) {
            int i = 100;
            while (i > 0) {
                i--;
                try {
                    Thread.sleep(10);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            return "www";
        }

4.开启AOP,否则Spring将识别不了

一.在 `applicationContext.xml`文件中加上AOP需要的配置 `<aop:aspectj-autoproxy/>`

`二.使用注解的话需加上`@EnableAspectJAutoProxy

@SpringBootApplication
    @EnableAspectJAutoProxy
    public class DemoTestApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(DemoTestApplication.class, args);
        }
    
    }