基于spring@aspect注解的aop实现

第一步：编写切面类

package com.dascom.hawk.app.web.tool;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

@Aspect
@Component
public class AnnotationAspectJ {

    //定义切面（"execution(* com.dascom.common.aop.*.*(..))）
    //当前配置的意思是所有添加了SuiteMessage的注解的方法作为切点
    @Pointcut("@annotation(com.dascom.common.annotation.SuiteMessage)")
    public void logPointCut() {
    }

    //前置通知
    @Before("logPointCut()")
    public void before(JoinPoint point) {
        String calssName = point.getTarget().getClass().getName();
        String method = point.getSignature().getName();
        System.out.println(calssName + " : " + method);
    }

    //后置通知
    @After("logPointCut()")
    public void after(JoinPoint point) {
        String method = point.getSignature().getName();
        System.out.println(method + ": end----");
    }

    //环绕通知
    @Around("logPointCut()")
    public Object around(ProceedingJoinPoint point) throws Throwable {
        long beginTime = System.currentTimeMillis();
        // 执行方法
        Object result = point.proceed();
        // 执行时长(毫秒)
        long time = System.currentTimeMillis() - beginTime;
        //异步保存日志
        System.out.println(time);
        return result;
    }
}

第二步：在spring的配置文件中添加注解扫描

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    <!-- 配置自动扫描的包 -->
    <context:component-scan base-package="com.dascom.hawk.app.web.tool"></context:component-scan>
    <!-- 自动为切面方法中匹配的方法所在的类生成代理对象。
       proxy-target-class="true" 这个的作用是struts的控制类都基础的actionSupport，必须添加这个，不然会报错
     -->
    <aop:aspectj-autoproxy proxy-target-class="true" />

</beans>

第三步：搞定。爽歪歪~~~