Spring AOP

目标类

public interface DService {

public void add(); public void delete();

}

目标子类

import org.springframework.stereotype.Service;

@Service(“serviceId”) public class DServiceImpl implements DService {

@Override public void add() { // TODO Auto-generated method stub System.out.println("2 add"); } @Override public void delete() { // TODO Auto-generated method stub System.out.println("2 delete"); }

}

切面类

import org.aspectj.lang.JoinPoint; import org.aspectj.lang.ProceedingJoinPoint; import org.aspectj.lang.annotation.After; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Pointcut; import org.springframework.stereotype.Component;

/** * 切面类，含有多个通知 */ @Component @Aspect public class PdAspect {

//切入点当前有效

// @Before(“execution(* com.formssi.aspect.b_anno.DServiceImpl.*(..))”) public void pdBefore(JoinPoint joinPoint){ System.out.println(“前置通知 ： ” + joinPoint.getSignature().getName()); }

//声明公共切入点 @Pointcut("execution(* com.formssi.aspect.b_anno.DServiceImpl.*(..))") private void pdPointCut(){ }

// @AfterReturning(value=”pdPointCut()” ,returning=”ret”) public void pdAfterReturning(JoinPoint joinPoint,Object ret){ System.out.println(“后置通知 ： ” + joinPoint.getSignature().getName() + ” , –>” + ret); }

// @Around(value = “pdPointCut()”) public Object pdAround(ProceedingJoinPoint joinPoint) throws Throwable{ System.out.println(“前”); //手动执行目标方法 Object obj = joinPoint.proceed();

System.out.println("后"); return obj; }

// @AfterThrowing(value=”execution(* com.formssi.aspect.b_anno.DServiceImpl.*(..))” ,throwing=”e”) public void pdAfterThrowing(JoinPoint joinPoint,Throwable e){ System.out.println(“抛出异常通知 ： ” + e.getMessage()); }

@After("pdPointCut()") public void pdAfter(JoinPoint joinPoint){ System.out.println("最终通知"); }

}

配置文件

1.扫描 注解类 context:component-scan base-package=”com.formssi.aspect.b_anno”>/context:component-scan>

2.确定 aop注解生效 aop:aspectj-autoproxy>

ps: 此处少了一些括号

测试

@org.junit.Test public void test() {

String xmlPath = "com/formssi/aspect/b_anno/beans.xml"; ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlPath); //获得目标类 DService userService = (DService) applicationContext.getBean("serviceId"); userService.add(); userService.delete(); }

特别注意

org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: file [D:\workplace\JavaEE\Pdspring\bin\com\formssi\aspect\b_anno\DService.class]; nested exception is java.lang.IllegalArgumentException 此错误，很可能是因为Spring的jar包需要导入4.3版本的在jdk1.8的情况下