aop

 做aop做一些事情：：：

package cn.happy.spring04aop;

public interface ISomeService {
  public void doSomeThing();
}

    package cn.happy.spring04aop;

public class SomeServiceImpl implements ISomeService {
   //核心业务
    @Override
    public void doSomeThing() {
        System.out.println("do ok? ok!yes");
    }

}

添加前置和后置

首先加入aop的jar包：aopalliance.jar

 package cn.happy.spring04aop.aop;

import java.lang.reflect.Method;

import org.springframework.aop.AfterReturningAdvice;

public class AfterAdvice implements AfterReturningAdvice {

    @Override
    public void afterReturning(Object returnValue, Method method,
            Object[] args, Object target) throws Throwable {
        System.out.println("=====after==========");
    }
}

package cn.happy.spring04aop.aop;

import java.lang.reflect.Method;

import org.springframework.aop.MethodBeforeAdvice;
/**
 * @author Happy
 */
public class BeforeAdvice implements MethodBeforeAdvice {
    @Override
    public void before(Method method, Object[] args, Object target)
            throws Throwable {
        System.out.println("==============before=======");
    }

    

}

有了前置和后置之后，需要配置applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
        ">
        <!--如果一个类实现了一个接口 ，那么默认使用的代理是jdk代理  -->
         <!--如果一个类没有实现了一个接口 ，那么默认使用的代理是cglib代理  -->
    <!-- 被代理对象 SomeServiceImpl -->
    <bean id="service" class="cn.happy.spring04aop.SomeServiceImpl"></bean>
    <!--beforeadvice 前置通知  -->
    <bean id="beforeAdvice" class="cn.happy.spring04aop.aop.BeforeAdvice"></bean>
    <!-- AfterAdvice 后置通知 -->
    <bean id="afterAdvice" class="cn.happy.spring04aop.aop.AfterAdvice"></bean>
    <!-- aop -->
    <aop:config>
    <aop:pointcut expression="execution(public void *(..))" id="mypt"/>
    <!--顾问 用来包含通知 -->
    <aop:advisor advice-ref="beforeAdvice" pointcut-ref="mypt"/>
    <aop:advisor advice-ref ="afterAdvice" pointcut-ref ="mypt"/>
    </aop:config>
    
</beans>

编写测试类：

package cn.happy.spring04aop;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import cn.happy.spring02printer.printer.Printer;

public class MyTest {
    @Test
    public void aopTest(){
        ApplicationContext ctx=new ClassPathXmlApplicationContext("cn/happy/spring04aop/applicationContext.xml");
        ISomeService service=(ISomeService)ctx.getBean("service");
        service.doSomeThing();
    }
}