spring aop实现打印方法执行时间

spring aop基于代理实现,主要包含两种----接口代理,类代理

接口代理   可参考jdk代理,主要通过反射来实现
类代理     可参考cglib代理,主要使用继承来实现

注:两种代理均无法实现对私有方法和静态方法的代理

这两种代理都可以看做代理设计模式的一种实现.

前一段时间要统计一个项目中各个方法的执行时间,就用spring aop做了一个实现,以下是相关代码

1.添加包依赖  注:aspectj版本过低会导致无法识别execution表达式

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-aop</artifactId>
    <version>${spring.version}</version>
</dependency>
<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>1.8.10</version>
</dependency>
<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjrt</artifactId>
    <version>1.8.9</version>
</dependency>
<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjtools</artifactId>
    <version>1.8.9</version>
</dependency>

2.配置文件

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

proxy-target-class强制类代理，可以避免无接口类的代理失败

因为我还要统计Controller层的方法,所以此处强制使用类代理

3.代码

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

import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @Author MissNull
 * @Description:
 * @Date: Created in 2017/8/14.
 */
@Aspect
@Component
public class PrintTime {
    private Map<Long, Map<String, List<Long>>> threadMap = new ConcurrentHashMap<>(200);

    @Pointcut(value = "execution(* com.ai.shop.controller..*.*(..))")
    public void controller() {
    }

    @Pointcut(value = "execution(* com.ai.shop.dao.impl.*.*(..))")
    public void dao() {
    }

    @Pointcut(value = "execution(* com.ai.shop.services.impl.*.*(..))")
    public void service() {
    }

    @Before(value = "controller() || dao() || service()")
    public void before(JoinPoint joinPoint) {
        System.out.println(joinPoint.toShortString() + " 开始");
        Map<String, List<Long>> methodTimeMap = threadMap.get(Thread.currentThread().getId());
        List<Long> list;
        if (methodTimeMap == null) {
            methodTimeMap = new HashMap<>();
            list = new LinkedList<>();
            list.add(System.currentTimeMillis());
            methodTimeMap.put(joinPoint.toShortString(), list);
            threadMap.put(Thread.currentThread().getId(), methodTimeMap);
        } else {
            list = methodTimeMap.get(joinPoint.toShortString());
            if (list == null) list = new LinkedList<>();
            list.add(System.currentTimeMillis());
            methodTimeMap.put(joinPoint.toShortString(), list);
        }
    }

    @After(value = "controller() || dao() || service()")
    public void after(JoinPoint joinPoint) {
        System.out.println(joinPoint.toShortString() + " 结束");
        Map<String, List<Long>> methodTimeMap = threadMap.get(Thread.currentThread().getId());
        List<Long> list = methodTimeMap.get(joinPoint.toShortString());
        System.out.println("耗时：" +
                (System.currentTimeMillis() - list.get(list.size() - 1)));
        list.remove(list.size() - 1);
    }
}

4.也可以在配置文件中声明,不用注解

<aop:config>
    <aop:pointcut id="allMethod" expression="execution(* com.ai.*.*.*.*(..))"/>
    <aop:aspect ref="printTime">
        <aop:before method="before" pointcut-ref="allMethod"/>
        <aop:after method="after" pointcut-ref="allMethod"/>
    </aop:aspect>
</aop:config>