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）

LogBeforeAdvice.java

public class LogBeforeAdvice {

    public void before(JoinPoint joinPoint) {

        System.out.println(joinPoint.getSignature().getName()+",start.............LogBeforeAdvice");

    }

}

applicationContext.xml

<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>

测试程序:

View Code

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：
  LogBeforeAdvice.java

  @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");
  
      }
  
  }

  applicationContext.xml

  <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

  AopTest.java

  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

  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)