AOP是Spring的核心，Spring不但自身对多种框架的集成是基于AOP,并且以非常方便的形式暴露给普通使用者。以前用AOP不多，主要是因为它以横截面的方式插入到主流程中，担心导致主流程代码不够清晰，定位问题不够方便，而在计费二期的项目里需要一个很适合用AOP来做的功能，就是要把对外接口和所调用的外部接口的耗时时间给记录下来，这个需求主要来自于计费一期的联调，常常发生系统间交互不够顺畅的情况，这就需要看每个接口调用时间来判定是谁的问题。
计费中心是整个后台系统的中间环节，与其他系统交互很多，这样的接口也很多，如果在每个接口的调用前后加时间记录比较繁琐，也影响主流程代码的美观，因此比较优雅的方式是用AOP,在不侵入原有代码的情况下，加上对接口调用的监控，并且可以在不需要的时候很容易移除。今天尝试了一下，感觉还挺好用，下面讲述一下实施步骤：托福答案
1)引入包依赖
本项目基于maven构建，因此加上包依赖比较方便，我需要的AOP依赖库有以下三个：
[xhtml]
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>2.5.6</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>2.5.6</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>1.6.1</version>
</dependency>
2)加上AOP的Spring配置文件
billing-spring-aop.xml:
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<?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:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">
<bean id="openApiLogAspect" class="com.alibaba.itbu.billing.framework.aop.OpenApiLogAspect">
</bean>
<aop:config>
<!-- 配置aspect切面类 -->
<aop:aspect ref="openApiLogAspect">
<!-- 配置pointcut,即切入点，对哪些类的哪些方法起到AOP的作用 -->
<aop:pointcut id="EsbPriceService"
expression="execution(* org.esb.biz.product.EsbPriceService.*())" />
<aop:pointcut id="EsbProductService"
expression="execution(* org.esb.biz.product.EsbProductService.*())" />
<aop:pointcut id="IAuthorizeControllerService"
expression="execution(* com.alibaba.bss.pc2.server.remoting.IAuthorizeControllerService.*())" />
<aop:pointcut id="IOpenApiOrderItemService"
expression="execution(* com.alibaba.itbu.billing.api.collect.IOpenApiOrderItemService.*())" />
<aop:pointcut id="IOpenApiBillingCollectService"
expression="execution(* com.alibaba.itbu.billing.api.collect.IOpenApiBillingCollectService.*())" />
<aop:pointcut id="IOpenApiInvoiceService"
expression="execution(* com.alibaba.itbu.billing.api.invoice.IOpenApiInvoiceService.*())" />
<aop:pointcut id="IOpenApiChargeProductInfoService"
expression="execution(* com.alibaba.itbu.billing.api.collect.IOpenApiChargeProductInfoService.*())" />
<!-- 配置advice,这里采用在业务方法执行前后进行拦截 -->
<aop:around method="logExecuteTime" pointcut-ref="EsbPriceService" />
<aop:around method="logExecuteTime" pointcut-ref="EsbProductService" />
<aop:around method="logExecuteTime" pointcut-ref="IAuthorizeControllerService" />
<aop:around method="logExecuteTime" pointcut-ref="IOpenApiOrderItemService" />
<aop:around method="logExecuteTime" pointcut-ref="IOpenApiBillingCollectService" />
<aop:around method="logExecuteTime" pointcut-ref="IOpenApiInvoiceService" />
<aop:around method="logExecuteTime" pointcut-ref="IOpenApiChargeProductInfoService" />
</aop:aspect>
</aop:config>
</beans>
<?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:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">
<bean id="openApiLogAspect" class="com.alibaba.itbu.billing.framework.aop.OpenApiLogAspect">
</bean>
<aop:config>
<!-- 配置aspect切面类 -->
<aop:aspect ref="openApiLogAspect">
<!-- 配置pointcut,即切入点，对哪些类的哪些方法起到AOP的作用 -->
<aop:pointcut id="EsbPriceService"
expression="execution(* org.esb.biz.product.EsbPriceService.*())" />
<aop:pointcut id="EsbProductService"
expression="execution(* org.esb.biz.product.EsbProductService.*())" />
<aop:pointcut id="IAuthorizeControllerService"
expression="execution(* com.alibaba.bss.pc2.server.remoting.IAuthorizeControllerService.*())" />
<aop:pointcut id="IOpenApiOrderItemService"
expression="execution(* com.alibaba.itbu.billing.api.collect.IOpenApiOrderItemService.*())" />
<aop:pointcut id="IOpenApiBillingCollectService"
expression="execution(* com.alibaba.itbu.billing.api.collect.IOpenApiBillingCollectService.*())" />
<aop:pointcut id="IOpenApiInvoiceService"
expression="execution(* com.alibaba.itbu.billing.api.invoice.IOpenApiInvoiceService.*())" />
<aop:pointcut id="IOpenApiChargeProductInfoService"
expression="execution(* com.alibaba.itbu.billing.api.collect.IOpenApiChargeProductInfoService.*())" />
<!-- 配置advice,这里采用在业务方法执行前后进行拦截 -->
<aop:around method="logExecuteTime" pointcut-ref="EsbPriceService" />
<aop:around method="logExecuteTime" pointcut-ref="EsbProductService" />
<aop:around method="logExecuteTime" pointcut-ref="IAuthorizeControllerService" />
<aop:around method="logExecuteTime" pointcut-ref="IOpenApiOrderItemService" />
<aop:around method="logExecuteTime" pointcut-ref="IOpenApiBillingCollectService" />
<aop:around method="logExecuteTime" pointcut-ref="IOpenApiInvoiceService" />
<aop:around method="logExecuteTime" pointcut-ref="IOpenApiChargeProductInfoService" />
</aop:aspect>
</aop:config>
</beans>
我是基于配置完成AOP接入，这样做的好处是不需要对原有主流程代码有任何浸入，并且也比较容易移除本AOP的拦截，这段代码主要就是配置aspect、pointcut和advice托福考前答案
3)编写监控耗时的advice
OpenApiLogAspect:
[java]
public class OpenApiLogAspect {
private static LoggerService logger = LoggerFactory.getLogger(OpenApiLogAspect.class);
public Object logExecuteTime(ProceedingJoinPoint joinPoint) throws Throwable{
Date start = new Date();
try{
return joinPoint.proceed(joinPoint.getArgs());
}catch(Exception err){
throw err;
}finally{
Date end = new Date();
logger.info("OpenApiExecuteTime:"+joinPoint.getSignature()。getName()+" takes "+(end.getTime()-start.getTime())+"ms");
}
}
}
public class OpenApiLogAspect {
private static LoggerService logger = LoggerFactory.getLogger(OpenApiLogAspect.class);
public Object logExecuteTime(ProceedingJoinPoint joinPoint) throws Throwable{
Date start = new Date();
try{
return joinPoint.proceed(joinPoint.getArgs());
}catch(Exception err){
throw err;
}finally{
Date end = new Date();
logger.info("OpenApiExecuteTime:"+joinPoint.getSignature()。getName()+" takes "+(end.getTime()-start.getTime())+"ms");
}
}
}
此段代码就是基于around的方式来拦截接口调用，在实际调用的前后加上时间记录，并最后在日志里打印出时间差。其中joinPoint.proceed(joinPoint.getArgs());是对实际接口的调用。
4)使监控可以配置化
此功能只会在调试阶段使用，并不需要在生产环境中运行，因此需要可以配置是否监控接口。实施这个配置化很简单，只需要通过配置决定是否把aop spring的配置文件加入到容器里就可以了，因此在总容器applicationContext.xml.vm里加上如下代码：托福改分
#if(${monitor_openapi_showTime}=="true")
<import resource="classpath*:bean/billing-spring-aop.xml" />
#end
在编译打包过程中会根据变量monitor_openapi_showTime来决定是否把billing-spring-aop.xml引入进来
5)运行效果
在监控开启的情况下，若发生接口调用，能从日志里看到如下记录：
2010-01-08 18:30:13,197 [OpenApiLogAspect.java:20] [com.alibaba.itbu.billing.framework.aop.OpenApiLogAspect] INFO com.alibaba.itbu.billing.framework.aop.OpenApiLogAspect :: OpenApiExecuteTime:installOrderItem takes 71ms
2010-01-08 18:30:27,188 [OpenApiLogAspect.java:20] [com.alibaba.itbu.billing.framework.aop.OpenApiLogAspect] INFO com.alibaba.itbu.billing.framework.aop.OpenApiLogAspect :: OpenApiExecuteTime:installOrderItem takes 0ms
2010-01-08 18:30:37,838 [OpenApiLogAspect.java:20] [com.alibaba.itbu.billing.framework.aop.OpenApiLogAspect] INFO com.alibaba.itbu.billing.framework.aop.OpenApiLogAspect :: OpenApiExecuteTime:installOrderItem takes 1ms