文章目录

• 一、AOP
• • 1、通过 Spring API 实现
  • 2、通过自定义类实现
  • 3、通过注解实现

一、AOP

使用AOP的织入，需要导入一个依赖包

        <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.7</version>
        </dependency>

业务接口UserService：

public class Address {
    private String address;

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }
}

实现类UserServiceImpl ：

public class UserServiceImpl implements  UserService{

    @Override
    public void add() {
        System.out.println("增加成功");
    }

    @Override
    public void delete() {
        System.out.println("删除成功");
    }

    @Override
    public void update() {
        System.out.println("更新成功");
    }

    @Override
    public void select() {
        System.out.println("查询成功");
    }
}

1、通过 Spring API 实现

注册bean且实现aop切入实现
BeforeLog:

public class BeforeLog 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(target.getClass().getName()+"的"+method.getName()+"被执行了");
    }
}

AfterLog:

public class AfterLog implements AfterReturningAdvice {
    @Override
    //returnValue:返回值
    public void afterReturning(Object returnValue, Method method, Object[] args, Object target) throws Throwable {
        System.out.println("执行了"+method.getName()+"方法,返回结果为:"+returnValue);
    }
}

配置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
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--注册bean-->
    <bean id="userService" class="com.Akatsuki.service.UserServiceImpl"/>
    <bean id="log" class="com.Akatsuki.log.Log"/>
    <bean id="afterLog" class="com.Akatsuki.log.AfterLog"/>

    <!--aop的配置-->
    <aop:config>
        <!--切入点 expression:表达式匹配要执行的方法-->
        <aop:pointcut id="pointcut" expression="execution(* com.Akatsuki.service.UserServiceImpl.*(..))"/>
        <!--执行环绕 advice-ref执行方法 . pointcut-ref切入点-->
        <aop:advisor advice-ref="log" pointcut-ref="pointcut"/>
        <aop:advisor advice-ref="afterlog" pointcut-ref="pointcut"/>
    </aop:config>

</beans>

    @Test
    public void test1() {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        // 动态代理的是接口
        // UserService userService = context.getBean("userService", UserService.class);
        UserService userService = (UserService) context.getBean("userService");
        userService.add();
    }

结果：

2、通过自定义类实现

自定义类:

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");
    }
}

配置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
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--注册bean-->
    <bean id="userService" class="com.Akatsuki.service.UserServiceImpl"/>
    <bean id="log" class="com.Akatsuki.log.Log"/>
    <bean id="afterLog" class="com.Akatsuki.log.AfterLog"/>

    <!--aop的配置-->
    <bean id="diy" class="com.Akatsuki.diy.DiyPointCut"/>
    <aop:config>
        <aop:aspect ref="diy">
            <aop:pointcut id="diys" expression="execution(* com.Akatsuki.service.UserServiceImpl.*(..))"/>
             <!--pointcut-ref不能与上面的aspect ref同名-->
            <aop:before method="before" pointcut-ref="diys"/>
            <aop:after method="after" pointcut-ref="diys"/>
        </aop:aspect>
    </aop:config>

</beans>

结果

3、通过注解实现

注解类:

    @Before("execution(* com.Akatsuki.service.UserServiceImpl.*(..))")
    public void before(){
        System.out.println("方法执行前");
    }
    @After("execution(* com.Akatsuki.service.UserServiceImpl.*(..))")
    public void after(){
        System.out.println("方法执行后");
    }
    @Around("execution(* com.Akatsuki.service.UserServiceImpl.*(..))")
    public void around(ProceedingJoinPoint jp) throws Throwable {
        System.out.println("环绕前");
        System.out.println("签名:"+jp.getSignature());
        //执行目标方法proceed
        Object proceed = jp.proceed();
        System.out.println("环绕后");
        System.out.println(proceed);
    }

配置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
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--注册bean-->
    <bean id="userService" class="com.Akatsuki.service.UserServiceImpl"/>
    <bean id="log" class="com.Akatsuki.log.Log"/>
    <bean id="afterLog" class="com.Akatsuki.log.AfterLog"/>

    <!--    aop的配置-->
	<!--    方式三:-->
    <bean id="annocation" class="com.Akatsuki.Annotation.AnnotationPointcut"/>
    <aop:aspectj-autoproxy/>
</beans>