AOP实现

AOP实现

动态代理：代理模式 - CoderDreams - 博客园 (cnblogs.com)

方式一：使用Spring的API(参数功能强大)

实现MethodBeforeAdvice接口

添加的功能

public class Log implements MethodBeforeAdvice {
    @Override
    /*
    * method: 要执行的目标对象的方法
    * args: 参数
    * target: 目标对象
    * */
    public void before(Method method, Object[] args, Object target) throws Throwable {
        System.out.println("方法"+method.getName());
        System.out.println("参数"+ Arrays.toString(args));
        System.out.println("对象"+target);
    }
}

原接口

public interface UserService {
    void add();

    void del();

    void upd();

    void get();
}

原接口实现类

public class UserServiceImpl implements UserService{
    @Override
    public void add() {
        System.out.println("增");
    }

    @Override
    public void del() {
        System.out.println("删");
    }

    @Override
    public void upd() {
        System.out.println("改");
    }

    @Override
    public void get() {
        System.out.println("查");
    }
}

配置文件

<?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: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.xsd
            ">

    <bean id="UserServiceImpl" class="com.aop.service.UserServiceImpl"></bean>
    <bean id="Log" class="com.aop.log.Log"></bean>

    <!--aop配置-->
    <aop:config>
        <!--切入点-->
        <aop:pointcut id="pointcut" expression="execution(* com.aop.service.UserServiceImpl.*(..))"/>

        <aop:advisor advice-ref="Log" pointcut-ref="pointcut"/>

    </aop:config>

</beans>

---

方式二：自定义类

新增功能

public class DiyPointCut {
    public void before() {
        System.out.println("==== 方法执行前 ===");
    }

    public void after() {
        System.out.println("==== 方法执行后 ===");
    }
}

接口和实现类同上

配置文件

<?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: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.xsd
            ">

    <bean id="UserServiceI" class="com.aop.service.UserServiceImpl"/>

    <!--自定义类-->
    <bean id="diy" class="com.aop.diy.DiyPointCut" />

    <aop:config>
        <aop:aspect ref="diy" >
            <!--切入点-->
            <aop:pointcut id="pointcut" expression="execution(* com.aop.service.UserServiceImpl.*(..))"/>

            <aop:before method="before" pointcut-ref="pointcut"/>

            <aop:after method="after" pointcut-ref="pointcut"/>
        </aop:aspect>
    </aop:config>

</beans>

---

测试类

public class MyTest {
    @Test
    public void test01() {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        UserService userService = context.getBean("UserServiceImpl", UserService.class);

        userService.get();
    }
}

第三种：使用注解

增加功能

@Aspect
public class DiyPointCut {
    @Before("execution(* com.aop.service.UserServiceImpl.*(..))")
    public void before() {
        System.out.println("==== 方法执行前 ===");
    }

    @After("execution(* com.aop.service.UserServiceImpl.*(..))")
    public void after() {
        System.out.println("==== 方法执行后 ===");
    }
}

配置文件

<?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: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.xsd
            ">

    <bean id="UserServiceImpl" class="com.aop.service.UserServiceImpl"/>

    <!--自定义类-->
    <bean id="diy" class="com.aop.diy.DiyPointCut" />

    <aop:aspectj-autoproxy/>

</beans>

测试类、接口、接口实现类同上