Spring AOP 实现方法1

applicationContext.xml

<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd">
<!--初测bean-->
<bean id="userService" class="com.yao.service.userServiceImpl">
</bean>
    <bean id="log" class="com.yao.log.log"></bean>
    <bean id="afterLog" class="com.yao.log.afterLog"></bean>

<!--配置aop  需要导入aop的约束-->
    <aop:config>
<!--切入点-->
        <aop:pointcut id="pointcut" expression="execution(* com.yao.service.userServiceImpl.*(..))"/>

<!--    执行环绕增加-->
        <aop:advisor advice-ref="log" pointcut-ref="pointcut"></aop:advisor>
        <aop:advisor advice-ref="afterLog" pointcut-ref="pointcut"></aop:advisor>
    </aop:config>
</beans>

afterLog.class

public class afterLog implements AfterReturningAdvice {
    public void afterReturning(Object o, Method method, Object[] objects, Object o1) throws Throwable {
        System.out.println("执行了"+method.getName()+"返回值"+o);
    }
}
log.class
public class log implements MethodBeforeAdvice {
    public void before(Method method, Object[] objects, Object o) throws Throwable {
        System.out.println(o.getClass().getName()+"的"+method.getName()+"被执行了");
    }
}

userService.interface
public interface userService {
    public void add();
    public void delete();
    public void update();
    public void query();
}

userServiceImpl.class

public class userServiceImpl implements userService {
    public void add() {
        System.out.println("增加了一个用户");
    }

    public void delete() {
        System.out.println("删除了一个用户");
    }

    public void update() {
        System.out.println("修改了一个用户");
    }

    public void query() {
        System.out.println("查找了一个用户");
    }
}

client.class

public class Client {
    public static void main(String[] args) {
         ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        userService userService = (userService) context.getBean("userService");
        userService.add();
    }
}