spring4中文技术手册

spring4spring4中文技术手册在《静态代理和动态代理》中提到了面对方面编程，主要就是基于动态代理。单独抽象出非业务的功能，效劳于某些业务方法。SpringAdvice，分别为：BeforeAdvice,AfterReturningAdvice,AroundAdvice,AfterthrowingAdvice。都是方法级别的，就是在某个方法执行前后插入一些非业务的操作，如打日志或者推断权限等。advice的实现，springxmlannotation(注释)。BeforeAdviceAfterAdviceAroundAdvice则可以在目标方法执行前后同时加上相关效劳；ThrowAdvice是在特别发生后执行某些操作。1.AdviceAspectSpring接口。BeforeAdviceorg.springframework.aop.MethodBeforeAdvice接口：1. 1. /**2.*Adviceinvokedbeforeamethodisinvoked.Suchadvicescannot3.*preventthemethodcallproceeding,unlesstheythrowaThrowable.4.*/5. publicinterfaceMethodBeforeAdviceextendsBeforeAdvice{6.7./**8.*Callbackbeforeagivenmethodisinvoked.9.*@parammethodmethodbeinginvoked10.*@paramargsargumentstothemethod11.*@paramtargettargetofthemethodinvocation.Maybe<code>null</code>.12.*@throwsThrowableifthisobjectwishestoabortthecall.13.*Anyexceptionthrownwillbereturnedtothecallerifit”s14.*allowedbythemethodsignature.Otherwisetheexception15.*willbewrappedasaruntimeexception.16.*/17.voidbefore(Methodmethod,Object[]args,Objecttarget)throwsThrowable;18.}AfterAfterAdviceorg.springframework.aop.AfterReturningAdvice接口：1. /**2.2.*Afterreturningadviceisinvokedonlyonnormalmethodreturn,notifan3.*exceptionisthrown.Suchadvicecanseethereturnvalue,butcannotchangeit.4.*/5. publicinterfaceAfterReturningAdviceextendsAfterAdvice{6./**7.*Callbackafteragivenmethodsuccessfullyreturned.8.*@paramreturnValuethevaluereturnedbythemethod,ifany9.*@parammethodmethodbeinginvoked10.*@paramargsargumentstothemethod11.*@paramtargettargetofthemethodinvocation.Maybe<code>null</code>.12.*@throwsThrowableifthisobjectwishestoabortthecall.13.*Anyexceptionthrownwillbereturnedtothecallerifit”s14.*allowedbythemethodsignature.Otherwisetheexception15.*willbewrappedasaruntimeexception.16.*/17.voidafterReturning(ObjectreturnValue,Methodmethod,Object[]args,Objecttarget)throwsThrowable;18.}AroundAroundAercept.MethodInterceptor接口：1. /**2.*<p>Theusershouldimplementthe{@link#invoke(MethodInvocation)}3.*methodtomodifytheoriginalbehavior.E.g.thefollowingclass4.*implementsatracinginterceptor(tracesallthecallsonthe5.*interceptedmethod(s)):6.*7.*<preclass=code>8.*classTracingInterceptorimplementsMethodInterceptor{9.* Objectinvoke(MethodInvocationi)throwsThrowable{10. *System.out.println(“method“+i.getMethod+“iscalledon“+11. *i.getThis+“withargs“+i.getArguments);12. *Objectret=ceed;13. *System.out.println(“method“+i.getMethod+“returns“+ret);14. *returnret;15. 15. * }16. *}17. *</pre>*/18.publicinterfaceMethodInterceptorextendsInterceptor{19.20./**21.*Implementthismethodtoperformextratreatmentsbeforeand22.*aftertheinvocation.Politeimplementationswouldcertainly23.*liketoinvoke{@linkJoinpoint#proceed}.24.*25.*@paraminvocationthemethodinvocationjoinpoint26.*@returntheresultofthecallto{@link27.*Joinpoint#proceed},mightbeinterceptedbythe28.*interceptor.29.*30.*@throwsThrowableiftheinterceptorsorthe31.*target-objectthrowsanexception.*/32.Objectinvoke(MethodInvocationinvocation)throwsThrowable;33.}类前面的注释说明白该方法的使用，就是要在类前面的注释说明白该方法的使用，就是要在invoke方法中调用MethodIceed，将执行传给下一个Interceptor，最终执行目标方法。在proceed方法前后加操作，到达Aroudadvice的作用。Aspectbeanorg.springframework.aop.framework.ProxyFactoryBeanAspect。如下：1. <beanid=“helloProxy“class=“org.springframework.aop.framework.ProxyFactoryBean“>2.业务接口-->3.<propertyname=“proxyInterfaces“value=“spring.advice.IHello“/>4.实现该接口的目标类-->5.<propertyname=“target“ref=“helloSpeaker“/>6.Aspect7.<propertyname=“interceptorNames“>8.<list>9.<value>throwAdvice</value>10.还可以连续加,如11.<value>logBeforeAdvice</value>-->12.12.</list>13.</property>14.</bean>补充下，其中的目标类、解释器(Aspect)Bean定义文件中先进展定义，然后才可以引用的。我们使用时，代码如下：IHelloIHellohelloProxy=(IHello)context.getBean(“helloProxy“);helloProxy.hello;BeanBeanAspectjoinPoint应用到目标方法上。补：IHellohello方法，HelloSpeakerIHello接口。hello方法前后参与日志记录。1. publicclassAroundAdviceimplementsMethodInterceptor{2.privateLoggerlogger=3.4.@Override5.publicObjectinvoke(MethodInvocationmethodInvocation)throwsThrowable{6.7.logger.log(Level.INFO,“methodstarts...“+methodInvocation.getMethod);8.result=methodIceed;9.ends...“+methodInvocation.getMethod);10.11.returnresult;12.}13.}配置：<?xml<?xmlversion=“1.0“encoding=“UTF-8“?>3.4.>5.<beanid=“helloSpeaker“class=“spring.advice.HelloSpeaker“/>IHelloIHellohelloProxy=(IHello)context.getBean(“helloProxy“);helloProxy.hello(“前后加日志“);就会消灭如下结果：6.<beanid=“aroundAdvice“class=“spring.advice.AroundAdvice“/>7.8.<beanid=“helloProxy“class=“org.springframework.aop.framework.ProxyFact