SPRING in ACTION 4th Note-fourth Chapter aspect-oriented spring-007-defines the around of the slice advice

I. Annotations @aspectj form

1.

 PackageCom.springinaction.springidol;ImportOrg.aspectj.lang.ProceedingJoinPoint;ImportOrg.aspectj.lang.annotation.Around;ImportOrg.aspectj.lang.annotation.Aspect;Importorg.aspectj.lang.annotation.Pointcut; @Aspect Public classaroundaudience {@Pointcut ("Execution (* com.springinaction.springidol.Performer.perform (..))")   Public voidperformance () {}//<start id= "Audience_around_bean"/>@Around ("Performance ()")   Public voidwatchperformance (Proceedingjoinpoint joinpoint) {Try{System.out.println ("The audience is taking their seats."); System.out.println ("The audience is turning off their cellphones"); LongStart =System.currenttimemillis ();      Joinpoint.proceed (); LongEnd =System.currenttimemillis (); System.out.println ("Clap clap clap clap Clap"); System.out.println ("The performance took" + (end-start)+ "milliseconds."); } Catch(Throwable t) {System.out.println ("Boo! We Want our Money back! "); }  }  //<end id= "Audience_around_bean"/>}

2.

1<?xml version= "1.0" encoding= "UTF-8"?>2<beans xmlns= "Http://www.springframework.org/schema/beans"3Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"4xmlns:aop= "HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP"5Xsi:schemalocation= "Http://www.springframework.org/schema/beans6http//www.springframework.org/schema/beans/spring-beans.xsd7http//WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP8http//www.springframework.org/schema/aop/spring-aop.xsd ">9 Ten<bean id= "Eddie" One       class= "Com.springinaction.springidol.Instrumentalist" > A<property name= "Instrument" > -<beanclass= "Com.springinaction.springidol.Guitar"/> -</property> the</bean> -  -<beanclass= "Com.springinaction.springidol.AroundAudience"/> -  +<aop:aspectj-autoproxy/> -  +</beans>

3. Or use a Java configuration file

1  PackageCom.springinaction.springidol;2 3 ImportOrg.springframework.context.annotation.Bean;4 ImportOrg.springframework.context.annotation.ComponentScan;5 Importorg.springframework.context.annotation.Configuration;6 ImportOrg.springframework.context.annotation.EnableAspectJAutoProxy;7 8 @Configuration9 @EnableAspectJAutoProxyTen @ComponentScan One  Public classconfig{ A @Bean -      Publicaroundaudience aroundaudience () { -         return Newaroundaudience (); the     } -      - @Bean -      Publicperformer Eddie () { +Instrumentalist instrumentalist =Newinstrumentalist (); - instrumentalist.setinstrument (instrument ()); +         returninstrumentalist; A     } at      - @Bean -      PublicInstrument instrument () { -         return NewGuitar (); -     } -}

4. Testing

1  PackageCom.springinaction.springidol;2 3 Importorg.junit.Test;4 ImportOrg.junit.runner.RunWith;5 Importorg.springframework.beans.factory.annotation.Autowired;6 ImportOrg.springframework.context.ApplicationContext;7 Importorg.springframework.test.context.ContextConfiguration;8 ImportOrg.springframework.test.context.junit4.SpringJUnit4ClassRunner;9 Ten@RunWith (Springjunit4classrunner.class) One //@ContextConfiguration ("Spring-aroundadvice.xml") A@ContextConfiguration (Classes=config.class)//Specify the configuration file -  Public classAroundadvicetest { - @Autowired the ApplicationContext context; -  - @Test -    Public voidAudienceshouldapplaud ()throwsException { +Performer Eddie = (performer) Context.getbean ("Eddie"); - eddie.perform (); +   } A  at}

Results:

0 milliseconds.

Second, the form of XML <aop:config></aop:config>

1.

1  PackageCom.springinaction.springidol;2 3 ImportOrg.aspectj.lang.ProceedingJoinPoint;4 5  Public classAroundaudience {6   //<start id= "Audience_around_bean"/>7    Public voidwatchperformance (Proceedingjoinpoint joinpoint) {8     Try {9System.out.println ("The audience is taking their seats.");TenSystem.out.println ("The audience is turning off their cellphones"); One       LongStart = System.currenttimemillis ();//<co id= "Co_beforeproceed"/> A  -Joinpoint.proceed ();//<co id= "Co_proceed"/> -        the       LongEnd = System.currenttimemillis ();//<co id= "Co_afterproceed"/> -System.out.println ("Clap clap clap clap Clap"); -SYSTEM.OUT.PRINTLN ("The performance took" + (end-start) -+ "milliseconds."); +}Catch(Throwable t) { -System.out.println ("Boo! We Want our Money back! ");//<co id= "co_afterexception"/> +     } A   } at   //<end id= "Audience_around_bean"/> -}

2.

1<?xml version= "1.0" encoding= "UTF-8"?>2<beans xmlns= "Http://www.springframework.org/schema/beans"3Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"4xmlns:aop= "HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP"5Xsi:schemalocation= "Http://www.springframework.org/schema/beans6http//www.springframework.org/schema/beans/spring-beans.xsd7http//WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP8http//www.springframework.org/schema/aop/spring-aop.xsd ">9 Ten<bean id= "Eddie" One       class= "Com.springinaction.springidol.Instrumentalist" > A<property name= "Instrument" > -<beanclass= "Com.springinaction.springidol.Guitar"/> -</property> the</bean> -  -<!--<start id= "Audience_bean"/>-- -<bean id= "Audience" +       class= "Com.springinaction.springidol.AroundAudience"/> -<!--<end id= "Audience_bean"/>-- +  A<!--<start id= "Audience_aspect"/>-- at<aop:config> -<aop:aspect ref= "Audience" > -<aop:pointcut id= "Performance" expression= -"Execution (* com.springinaction.springidol.Performer.perform (..))" -/> -  in<Aop:around -pointcut-ref= "Performance" tomethod= "Watchperformance"/> +</aop:aspect> -</aop:config> the<!--<end id= "Audience_aspect"/>-- *  $</beans>

SPRING in ACTION 4th Note-fourth Chapter aspect-oriented spring-007-defines the around of the slice advice