02、spring Aop入门配置

AOP概念： spring aop为面向切面编程，通过编译方式和运行期动态代理实现程序应用功能的一种技术；其目的是为降低程序部件间的耦合度，提高可复用性。

1、导入依赖

<dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.3.7</version>
    </dependency>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.6</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>5.3.7</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>test</scope>
    </dependency>
</dependencies>

2、创建连接点服务层业务

服务接口：

public interface Myservice {
    public abstract void save();
}

服务实现类

public class MyserviceImpl implements Myservice {
    @Override
    public void save() {
        System.out.println("保存业务....");
    }
}

3、创建增强类

public class Logger {

    public void befoerLog(){
        System.out.println("前置通知....");
    }

    public void afterReturningLog(){
        System.out.println("后置通知....");
    }

    public void afterThrowing(){
        System.out.println("异常通知....");
    }

    public void afterLog(){
        System.out.println("最终通知....");
    }
    
}

4、配置bean.xml文件

<?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:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--配置MyserviceImpl对象-->
    <bean id="myservice" class="com.boat.service.impl.MyserviceImpl"></bean>

    <!--配置Logger对象-->
    <bean id="logger" class="com.boat.advice.Logger"></bean>

    <!--配置通知-->
    <aop:config>
        
        <!--配置切入点，及表达式-->
        <aop:pointcut id="mypointcut" expression="execution(* com.boat.service..*.*(..))"/>
        
        <!--建立增强类与切面点关系-->
        <aop:aspect id="advisor" ref="logger">
            <!--配置前置通知-->
            <aop:before method="befoerLog" pointcut-ref="mypointcut"></aop:before>
            <!--配置后置通知-->
            <aop:after-returning method="afterReturningLog" pointcut-ref="mypointcut"></aop:after-returning>
            <!--配置异常通知-->
            <aop:after-throwing method="afterThrowing" pointcut-ref="mypointcut"></aop:after-throwing>
            <!--配置最终通知-->
            <aop:after method="afterLog" pointcut-ref="mypointcut"></aop:after>
        </aop:aspect>
    </aop:config>
</beans>

5、编写测试类

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"classpath:service.xml"})
public class TestSpring {

    @Autowired
    private Myservice myservice;

    @Test
    public void show(){
        myservice.save();
    }
    
}

运行结果为：