AOP是Spring的核心，Spring不但自身對多種框架的集成是基于AOP,并且以非常方便的形式暴露給普通使用者。以前用AOP不多，主要是因為它以橫截面的方式插入到主流程中，擔心導致主流程代碼不夠清晰，定位問題不夠方便，而在計費二期的項目里需要一個很適合用AOP來做的功能，就是要把對外接口和所調用的外部接口的耗時時間給記錄下來，這個需求主要來自于計費一期的聯調，常常發生系統間交互不夠順暢的情況，這就需要看每個接口調用時間來判定是誰的問題。
計費中心是整個后臺系統的中間環節，與其他系統交互很多，這樣的接口也很多，如果在每個接口的調用前后加時間記錄比較繁瑣，也影響主流程代碼的美觀，因此比較優雅的方式是用AOP,在不侵入原有代碼的情況下，加上對接口調用的監控，并且可以在不需要的時候很容易移除。今天嘗試了一下，感覺還挺好用，下面講述一下實施步驟：托福答案
1)引入包依賴
本項目基于maven構建，因此加上包依賴比較方便，我需要的AOP依賴庫有以下三個：
[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:
[xhtml]
<?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切面類 -->
<aop:aspect ref="openApiLogAspect">
<!-- 配置pointcut,即切入點，對哪些類的哪些方法起到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,這里采用在業務方法執行前后進行攔截 -->
<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切面類 -->
<aop:aspect ref="openApiLogAspect">
<!-- 配置pointcut,即切入點，對哪些類的哪些方法起到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,這里采用在業務方法執行前后進行攔截 -->
<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，這樣做的好處是不需要對原有主流程代碼有任何浸入，并且也比較容易移除本AOP的攔截，這段代碼主要就是配置aspect、pointcut和advice托福考前答案
3)編寫監控耗時的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");
}
}
}
此段代碼就是基于around的方式來攔截接口調用，在實際調用的前后加上時間記錄，并最后在日志里打印出時間差。其中joinPoint.proceed(joinPoint.getArgs());是對實際接口的調用。
4)使監控可以配置化
此功能只會在調試階段使用，并不需要在生產環境中運行，因此需要可以配置是否監控接口。實施這個配置化很簡單，只需要通過配置決定是否把aop spring的配置文件加入到容器里就可以了，因此在總容器applicationContext.xml.vm里加上如下代碼：托福改分
#if(${monitor_openapi_showTime}=="true")
<import resource="classpath*:bean/billing-spring-aop.xml" />
#end
在編譯打包過程中會根據變量monitor_openapi_showTime來決定是否把billing-spring-aop.xml引入進來
5)運行效果
在監控開啟的情況下，若發生接口調用，能從日志里看到如下記錄：
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