Spring AOP功能的实现

主要有两种方式：一种是基于XML Schema的设置，一种是基于Annotation的支持

基于XML Schema的前置通知（现在LogBeforeAdvice不需要实现MethodBeforeAdvice）

public class LogBeforeAdvice {public void before(JoinPoint joinPoint) {System.out.println(joinPoint.getSignature().getName()+",start.............LogBeforeAdvice");}
}

<bean id="logBeforeAdvice" class="com.edu.cug.LogBeforeAdvice"></bean><aop:config><aop:aspect id="logBeforeAspect" ref="logBeforeAdvice"><aop:pointcut id="LogbeforePointcut" expression="execution(* hello*(..))"/><aop:before pointcut-ref="LogbeforePointcut" method="before"/></aop:aspect></aop:config>

spring的主要功能是什么、测试程序:

public class AopTest {public static void main(String[] args) {BeanFactory factory = new ClassPathXmlApplicationContext("applicationContext.xml");IHello bean = (IHello) factory.getBean("IHello");bean.hello1("AOP1");bean.hello2("AOP2");}
}

测试结果

hello1,start.............LogBeforeAdvice
hello1,AOP1
hello2,start.............LogBeforeAdvice
hello2,AOP2

• 基于Annotation的前置通知
• 定义切面：

  @Aspect
  public class LogBeforeAdvice {@Pointcut("execution(* com.edu.cug.IHello.*(..)) ")public void anymethod(){} @Before("anymethod()")public void before(JoinPoint joinPoint) {System.out.println(joinPoint.getSignature().getName()+ ",start.............LogBeforeAdvice");}
  }

  <bean id="IHello" class="com.edu.cug.IHelloImpl"></bean><bean id="logBeforeAdvice" class="com.edu.cug.LogBeforeAdvice"></bean><aop:aspectj-autoproxy/>

  测试程序

  public class AopTest {public static void main(String[] args) {BeanFactory factory = new ClassPathXmlApplicationContext("applicationContext.xml");IHello bean = (IHello) factory.getBean("IHello");bean.hello1("AOP1");bean.hello2("AOP2");}
  }

  Spring的核心。测试结果

  hello1,start.............LogBeforeAdvice
  hello1,AOP1
  hello2,start.............LogBeforeAdvice
  hello2,AOP2

  在Spring2.x中要声明Pointcut，主要包括两个部分：Pointcut表达式(expression)与Pointcut签名(signature)