Spring AOP

关于aop，个人的理解就是在执行某个方法之前、之后或执行时等几个期间执行另一个方法。例如，有一个方法sleep()，实现是睡觉，在睡觉前要先玩下手机，定义一个类SleepHelper并继承接口MethodBeforeAdvice,这个接口下的方法的实现就是在睡觉之前要做的事，而如何在执行睡觉这个动作之前执行玩手机这个动作，就要通过xml配置文件或注解来配置

 

1.通过xml文件配置

Java代码：

//接口类
public interface ISleepable {
    void sleep();
}

//实现类
public class Human implements ISleepable{
    public void sleep() {
        System.out.println("我要睡觉了");
    }
}

//通知类
public class SleepHelper implements MethodBeforeAdvice,AfterReturningAdvice{
    public void afterReturning(Object o, Method method, Object[] objects, Object o1) throws Throwable {
        System.out.println("我已经睡着了");
    }
 
    public void before(Method method, Object[] objects, Object o) throws Throwable {
        System.out.println("睡觉前要玩会手机");
    }
}

//测试代码
public class DoTest {
    @Test
    public void iWannaSleep() {
        ApplicationContext context = new ClassPathXmlApplicationContext("ApplicationContext.xml");
        ISleepable human = (ISleepable) context.getBean("humanProxy");
        human.sleep();
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       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-3.0.xsd " >
    <bean id="sleepHelper" class="sample2.SleepHelper"/>
    <bean id="human" class="sample2.Human"/>
    <!--正则表达式切点，配置所有sleep结尾的方法--> 
    <bean id="sleepPointcut" class="org.springframework.aop.support.JdkRegexpMethodPointcut">
        <property name="pattern" value=".*sleep" />
    </bean>
    <!--通知--> 
    <bean id="sleepHelperAdvisor" class="org.springframework.aop.support.DefaultPointcutAdvisor">
        <property name="advice" ref="sleepHelper"/>
        <property name="pointcut" ref="sleepPointcut"/>
    </bean>
    <!--代理--> 
    <bean id="humanProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
        <property name="target" ref="human"/>
        <property name="interceptorNames" value="sleepHelperAdvisor"/>
        <property name="proxyInterfaces" value="sample2.ISleepable"/>
    </bean>
</beans>

或

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       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-3.0.xsd " >
    <bean id="sleepHelper" class="sample2.SleepHelper"/>
    <bean id="sleepAdvisor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
        <property name="advice" ref="sleepHelper"/>
        <property name="pattern" value=".*sleep"/>
    </bean>
    <bean id="humanProxy" class="sample2.Human"/>
    <bean class="org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator"/>
</beans>

 

 

2.通过注解

除测试代码和配置外，其他一样

//测试代码
public class DoTest {
    @Test
    public void iWannaSleep() {
        ApplicationContext context = new ClassPathXmlApplicationContext("ApplicationContext.xml");
        ISleepable human = (ISleepable) context.getBean("human");
        human.sleep();
    }
}

<?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:aop="http://www.springframework.org/schema/aop"
       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-3.0.xsd">
    <bean id="human" class="sample2.Human"/>
    <bean id="sleepHelper" class="sample2.SleepHelper"/>
 
    <!-- 自动扫描被aspectj注解的类 -->
    <aop:aspectj-autoproxy />
</beans>

 

 

另附我的pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
 
    <groupId>maven-springaop-demo</groupId>
    <artifactId>com.tom</artifactId>
    <version>1.0-SNAPSHOT</version>
 
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.9</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>4.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>4.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.1</version>
        </dependency>
        <dependency>
            <groupId>aopalliance</groupId>
            <artifactId>aopalliance</artifactId>
            <version>1.0</version>
        </dependency>
        <dependency>
            <groupId>asm</groupId>
            <artifactId>asm</artifactId>
            <version>3.3.1</version>
        </dependency>
        <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib</artifactId>
            <version>2.2.2</version>
        </dependency>
 
    </dependencies>
 
</project>