spring06Aop

1.实现前置增强 必须实现接口MethodBeforeAdvice接口

创建对应的文件

public interface Animal {//主业务接口
    void  eat();  //目标方法
    void  sleep();
}

public class Dog implements Animal {//目标对象
    /*
     * 专心我们的逻辑  
     * 至于方法之前和方法之后要做的事情！我不关注！
     * Ioc:降低了主业务之间的耦合度
     * AOP：降低了主业务和交叉业务逻辑之间的耦合度
     */
    @Override
    public void eat() {
        System.out.println("Dog在吃骨头");
    }

    @Override
    public void sleep() {
         System.out.println("Dog睡觉");
    }

}

public class AnimalBeforeAdvice implements MethodBeforeAdvice {
    /**
     * method:执行的方法
     * args：方法的参数
     * target:目标类对象
     */
    @Override
    public void before(Method method, Object[] args, Object target)
            throws Throwable {
        System.out.println("进入 了 前置 增强..............MethodBeforeAdvice");
    }

}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"  
    xmlns:c="http://www.springframework.org/schema/c"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 配置 目标对象 -->
<bean id="dog" class="cn.bdqn.dao.impl.Dog"/>
 
<!-- 配置前置 增强 -->
<bean id="before" class="cn.bdqn.advice.AnimalBeforeAdvice"/>
 
 
<!--  生成 代理对象  -->
 <bean id="proxyFactoryBean" class="org.springframework.aop.framework.ProxyFactoryBean">
     <!-- 设置目标对象（被代理的对象）<property name="targetName" value="dog"/>  -->
   <property name="target" ref="dog"/>
      <!-- 设置增强方式 -->
   <property name="interceptorNames">
        <value>before</value>
   </property>
  </bean>
 
</beans>

public class AnimalTest {
    
    @Test
    public  void  test01(){    
        ApplicationContext context=
                new ClassPathXmlApplicationContext("applicationContext.xml");
        //使用代理对象进行操作
        Animal animal=(Animal) context.getBean("proxyFactoryBean");
        animal.eat();
        System.out.println("************");
        animal.sleep();
    }
}

2.实现后置增强 必须实现接口AfterReturningAdvice接口

public class AnimalAfterAdvice implements AfterReturningAdvice {
/**
 * returnValue:返回值 ,能获取返回值 但是如果对返回值进行了操作！没有意义！
 * afterReturning（）就没有返回值
 */
    @Override
    public void afterReturning(Object returnValue, Method method,
            Object[] args, Object target) throws Throwable {
            System.out.println("执行了 后置 通知.................AfterReturningAdvice");
    }

}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"  
    xmlns:c="http://www.springframework.org/schema/c"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 配置 目标对象 -->
<bean id="dog" class="cn.bdqn.dao.impl.Dog"/>
 
<!-- 配置前置 通知-->
<bean id="before" class="cn.bdqn.advice.AnimalBeforeAdvice"/>
<!-- 配置后置 通知-->
<bean id="after" class="cn.bdqn.advice.AnimalAfterAdvice"/>
 
 
<!--  生成 代理对象  -->
 <bean id="proxyFactoryBean" class="org.springframework.aop.framework.ProxyFactoryBean">
     <!-- 设置目标对象（被代理的对象）<property name="targetName" value="dog"/>  -->
   <property name="target" ref="dog"/>
      <!-- 设置增强方式     同时配置多个增强方式01 .value="before,after"-->
   <property name="interceptorNames" >
       <!--   02. 使用array
        <array>
          <value>before</value>
          <value>after</value>
        </array> -->
         <list>
          <value>before</value>
          <value>after</value>
        </list>
   </property>
  </bean>
 
</beans>

测试代码不变 直接运行 

3.实现环绕增强 必须实现接口MethodInterceptor接口

public class AnimalAroundAdvice implements MethodInterceptor {
/**
 * 
 * 环绕增强  是在前置增强之后  和后置增强之前  执行！
 * 可以对方法的返回值进行一系列的操作
 */
    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
         System.out.println("方法之前........MethodInterceptor");
         Object result = invocation.proceed();
          //判断是否有返回值
         if (result!=null) {  
        result=((String)result).toUpperCase();
        }
         
         System.out.println("方法之后........MethodInterceptor");
        return result;
    }

}

可以修改Animal中的任意一个方法带有返回值的进行测试！ 如

public interface Animal {//主业务接口
    String  eat();  //目标方法
    void  sleep();
}

public class Dog implements Animal {//目标对象
    @Override
    public String eat() {
        System.out.println("Dog在吃骨头");
        return  "abcd";
    }

    @Override
    public void sleep() {
         System.out.println("Dog睡觉");
    }

}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"  
    xmlns:c="http://www.springframework.org/schema/c"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 配置 目标对象 -->
<bean id="dog" class="cn.bdqn.dao.impl.Dog"/>
<!-- 配置环绕 通知-->
<bean id="around" class="cn.bdqn.advice.AnimalAroundAdvice"/>
 
<!--  生成 代理对象  -->
 <bean id="proxyFactoryBean" class="org.springframework.aop.framework.ProxyFactoryBean">
   <property name="target" ref="dog"/>
   <property name="interceptorNames" >
         <list>
          <value>around</value>
        </list>
   </property>
  </bean>
 
</beans>

//测试返回值
    @Test
    public  void  test02(){    
        ApplicationContext context=
                new ClassPathXmlApplicationContext("applicationContext.xml");
        //使用代理对象进行操作
        Animal animal=(Animal) context.getBean("proxyFactoryBean");
        System.out.println(animal.eat());
        System.out.println("************");
        animal.sleep();
    }

效果图

 4.实现自定义增强

并不是所有的方法都需要增强，那么我们就需要自定义增强的方法

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"  
    xmlns:c="http://www.springframework.org/schema/c"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 配置 目标对象 -->
<bean id="dog" class="cn.bdqn.dao.impl.Dog"/>
 
<!-- 配置前置 通知-->
<bean id="before" class="cn.bdqn.advice.AnimalBeforeAdvice"/>

 <!-- 自定义通知的切入点  -->
 <bean id="myAdvice" class="org.springframework.aop.support.NameMatchMethodPointcutAdvisor">
    <property name="advice"  ref="before"></property>
     <property name="mappedNames">
       <list>
        <value>eat</value> <!-- eat之外的方法就不会有前置通知了  -->
       </list>
     </property>
 </bean>
 
 
<!--  生成 代理对象  -->
 <bean id="proxyFactoryBean" class="org.springframework.aop.framework.ProxyFactoryBean">
   <property name="target" ref="dog"/>
   <property name="interceptorNames" >
         <list>
          <value>myAdvice</value>  <!--引入自定义增强  -->
        </list>
   </property>
  </bean>
 
</beans>

测试代码不变