JavaEE企業(yè)級項目開發(fā)（第3版）課件 微課5-8：基于注解的AspectJ

主講人：閭楓延遲符基于注解的AspectJSpringAOP基于注解的AspectJ延遲符

AspectJ框架為AOP的實現(xiàn)提供了一套注解，用以取代Spring配置文件中為實現(xiàn)AOP功能所配置的臃腫代碼。常用的AspectJ注解如下：基于注解的AspectJ延遲符學(xué)習(xí)案例案例代碼使用基于注解的AspectJ

基于注解的AspectJ-案例延遲符packagecom.test.dao;//員工接口類publicinterfaceEmployeeDAO{//添加員工publicvoidaddEmployee();//刪除員工publicvoiddeleteEmployee();}packagecom.test.dao;@Repository//員工操作實現(xiàn)類publicclassEmployeeDAOImplimplementsEmployeeDAO{@OverridepublicvoidaddEmployee(){System.out.println("添加員工操作......");}@OverridepublicvoiddeleteEmployee(){System.out.println("刪除員工操作......");}}0.業(yè)務(wù)類基于注解的AspectJ-案例延遲符@Component@AspectpublicclassAnnotationAdvice{//定義切入點表達(dá)式

@Pointcut("execution(*com.test.dao.IHello.*(..))")publicvoidmyPointcut1(){}//前置通知@Before("myPointcut1()")publicvoidbefore(JoinPointjoinPoint){System.out.print("前置通知，模擬權(quán)限管理");System.out.println(",目標(biāo)對象為："+joinPoint.getTarget()+",被增強(qiáng)處理的方法："+joinPoint.getSignature().getName());}//后置返回通知@AfterReturning("myPointcut1()")publicvoidafterReturning(JoinPointjoinPoint){System.out.print("后置返回通知："+"模擬刪除臨時文件");System.out.println(",被增強(qiáng)處理的方法："+joinPoint.getSignature().getName());}

//環(huán)繞通知

@Around("execution(public*com.test.dao.EmployeeDAO.*(..))")publicObjectaround(ProceedingJoinPointproceedingJoinPoint)throwsThrowable{//開始System.out.println("環(huán)繞開始：執(zhí)行目標(biāo)方法，模擬開啟事務(wù)");//執(zhí)行當(dāng)前目標(biāo)方法Objectobject=proceedingJoinPceed();//結(jié)束System.out.println("環(huán)繞結(jié)束：執(zhí)行目標(biāo)方法后，模擬關(guān)閉事務(wù)");returnobject;}//異常通知@AfterThrowing(value="myPointcut1()",throwing="e")publicvoidexcept(Throwablee){System.out.println("異常通知："+"程序拋出異常了"+e.getMessage());}//后置通知，即最終通知@After("myPointcut1()")publicvoidafter(){System.out.println("最終通知：模擬釋放資源");}}1.定義通知類基于注解的AspectJ-案例延遲符<?xmlversion="1.0"encoding="UTF-8"?><beansxmlns="/schema/beans"xmlns:xsi="/2001/XMLSchema-instance"xmlns:aop="/schema/aop"xmlns:context="/schema/context"xsi:schemaLocation="/schema/beans /schema/beans/spring-beans-4.3.xsd /schema/aop /schema/aop/spring-aop-4.3.xsd/schema/context /schema/context/spring-context-4.3.xsd"><context:component-scanbase-package="com.test"></context:component-scan><context:annotation-config></context:annotation-config><!--啟動注解聲明支持--><aop:aspectj-autoproxy/></beans>2.添加配置基于注解的AspectJ-案例延遲符publicclassAnnotationAdviceTest{publicstaticvoidmain(String[]args){//讀取類路徑下的配置文件ApplicationContextcontext=newClassPathXmlApplicationContext("applicationContext.xml");//獲取Spring容器中的Bean實例IHellohelloProxy=(IHello)context.getBean("helloImpl");helloProxy.hello("王小二");System.out.println("-----------------------------------------------");