Spring AOP创建BeforeAdvice和AfterAdvice实例

 BeforeAdvice

  1、会在目标对象的方法执行之前被调用。

   2、通过实现MethodBeforeAdvice接口来实现。

   3、该接口中定义了一个方法即before方法,before方法会在目标对象target之前执行。

 

AfterAdvice

     1、在目标对象的方法执行之后被调用

     2、通过实现AfterReturningAdvice接口实现

 

实现目标:

        在方法之前调用执行某个动作。

 

IHello 和Hello:

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public interface IHello {
   public void sayHello(String str);
}
public class Hello implements IHello {
    @Override
    public void sayHello(String str) {
        System.out.println("你好"+str);
    }
}

SayBeforeAdvice:

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public class SayBeforeAdvice implements MethodBeforeAdvice {
 
    @Override
    public void before(Method arg0, Object[] arg1, Object arg2) throws Throwable {
        // TODO Auto-generated method stub
       System.out.println("在方法执行前做事情!");
    }
 
}

SayAfterAdvice文件:

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public class SayAfterAdvice implements AfterReturningAdvice {
 
    @Override
    public void afterReturning(Object arg0, Method arg1, Object[] arg2, Object arg3) throws Throwable {
        // TODO Auto-generated method stub
        System.out.println("在方法执行后做事情!");
    }
 
}

  

 

applicationContext.xml:

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
"http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>
    <!-- 建立目标对象实例 -->
    <bean id="bean_hello" class="com.pb.Hello" />
    <!-- 创建执行前advice实例 -->
    <bean id="sba" class="com.pb.SayBeforeAdvice" />
    <!-- 创建执行后advice实例 -->
    <bean id="sfa" class="com.pb.SayAfterAdvice" />
    <!-- 建立代理对象 -->
    <bean id="helloProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
        <!-- 设置代理的接口 -->
        <property name="proxyInterfaces">
            <value>com.pb.IHello</value>
        </property>
        <!-- 设置目标对象实例 -->
        <property name="target">
            <ref bean="bean_hello"/>
        </property>
        <!-- 设置Advice实例 -->
        <property name="interceptorNames">
            <list>
                <value>sba</value>
                <value>sfa</value>
            </list>
        </property>
    </bean>
</beans>

  

Main执行:

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public static void main(String[] args) {
        // TODO Auto-generated method stub
        ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
         
        IHello hello=(IHello)context.getBean("helloProxy");
        hello.sayHello("访客");
    }

  

执行效果:

 

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