springMVC Aspect AOP 接口耗时统计

　　在接口开发中，我们通常需要统计接口耗时，为后续接口性能做统计。在springMVC中可以用它的aop来记录日志。

　　1、在spring配置文件中开启AOP

    <!--*************** 支持aop **************** -->
    <aop:aspectj-autoproxy proxy-target-class="true" />

　　2、编写AOP

package com.parry.demo.aop;

import org.apache.log4j.Logger;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;

/**
 * <p>
 * PerformanceInterceptor 性能统计接口：接口耗时统计
 * <p>*/
@Aspect
@Component
public class PerformanceInterceptor {

    private Logger log = Logger.getLogger(PerformanceInterceptor.class);

    //我需要监控所有controlller的耗时（controller放在包com.parry.demo.controller下面）
    @Around("execution(* com.parry.demo.controller.*.*(..))")
    public Object logTome(ProceedingJoinPoint pjp) throws Throwable {
        long begin = System.currentTimeMillis();
        String method = pjp.getSignature().getName();
        String className = pjp.getTarget().getClass().getName();

        Object ret = pjp.proceed();
        log.info("func<doAround> method<" + className + "." + method + "> cost time <"
                + (System.currentTimeMillis() - begin) + ">ms");
        return ret;
    }
}

　　3、测试访问接口

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　　4、关于AOP的一些说明

　　（1）一些常见的切入点

• execution(public * * (. .))    任意公共方法被执行时，执行切入点函数
• execution( * set* (. .))   任何以一个“set”开始的方法被执行时，执行切入点函数
• execution( * com.demo.service.AccountService.* (. .))  当接口AccountService 中的任意方法被执行时，执行切入点函数
• execution( * com.demo.service.*.* (. .))  当service 包中的任意方法被执行时，执行切入点函数
• within(com.demo.service.*)  在service 包里的任意连接点
• within(com.demo.service. .*)  在service 包或子包的任意连接点
• this(com.demo.service.AccountService) 实现了AccountService 接口的代理对象的任意连接点
• target(com.demo.service.AccountService) 实现了AccountService 接口的目标对象的任意连接点
• args(Java.io.Serializable)  任何一个只接受一个参数，且在运行时传入参数实现了 Serializable 接口的连接点

　　（2）AOP多样的方法

• @Before：方法前执行
• @AfterReturning：运行方法后执行
• @AfterThrowing：Throw后执行
• @After：无论方法以何种方式结束，都会执行（类似于finally）
• @Around：环绕执行