使用MethodInterceptor实现AOP

最新推荐文章于 2023-08-07 17:32:38 发布

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本文通过定义接口及其实现类，展示了如何利用自定义的MyInterceptor拦截器结合Spring框架实现面向切面编程（AOP）。具体介绍了如何在Spring配置文件中设置代理类和拦截器，最终实现了对目标方法的前后增强。

学习笔记

使用MethodInterceptor实现AOP
定义接口

public interface Interface {
    public void hello();
}

两个实现

第一个实现

public class InterfaceImpl implements Interface {
    /**
     * @see com.alipay.aop.BusinessInterface#hello()
     */
    @Override
    public void hello() {
        System.out.println("AOP TEST!!");
    }
}

第二个实现

public class InterfaceImplTest implements Interface {
    /**
     * @see aop.Interface#hello()
     */
    @Override
    public void hello() {
        System.out.println("helo world!!");
    }
}

实现自己的代理类，创建自己的interceptor

  public class MyInterceptor implements MethodInterceptor {
        /**
         * @see org.aopalliance.intercept.MethodInterceptor#invoke(org.aopalliance.intercept.MethodInvocation)
         */
        @Override
        public Object invoke(MethodInvocation methodInvocation) throws Throwable {
            String info = methodInvocation.getMethod().getDeclaringClass()+ "." +
            methodInvocation.getMethod().getName() + "()";
            System.out.println(info);
            try{
                Object result = methodInvocation.proceed();
                return result;
            }
            finally{
                System.out.println(info);
            }
        }
  }

定义Spring配置文件

<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:sofa="http://img.alipay.net/dtd/schema/service"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:webflow="http://www.springframework.org/schema/webflow-config"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
     http://img.alipay.net/dtd/schema/service http://img.alipay.net/dtd/schema/service/sofa-service.xsd
     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
     http://www.springframework.org/schema/webflow-config http://www.springframework.org/schema/webflow-config/spring-webflow-config-2.0.xsd"
default-autowire="byName">
<bean id="beanTarget" class="aop.InterfaceImpl"/>
<bean id="hello" class="aop.InterfaceImplTest" />
<bean id="myInterceptor" class="aop.MyInterceptor"/>
<bean id="bean" class="org.springframework.aop.framework.ProxyFactoryBean">
    <property name="proxyInterfaces">
        <value>aop.Interface</value>
    </property>

    <property name="interceptorNames">
        <list>
            <value>myInterceptor</value>
            <value>beanTarget</value>
        </list>
    </property>
</bean>

  <bean id="testBean" class="org.springframework.aop.framework.ProxyFactoryBean">
      <property name="proxyInterfaces">
          <value>aop.Interface</value>
      </property>

      <property name="interceptorNames">
          <list>
              <value>myInterceptor</value>
              <value>hello</value>
          </list>
      </property>
  </bean>
</beans>