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  • 基于注解的AOP开发

    1.基于注解的AOP开发步骤

    (1)创建目标接口和目标类(内部有切点)

    (2)创建切面类(内部有增强方法)

    (3)将目标类和切面类的对象创建权交给spring

    (4)在切面类中使用注解配置织入关系

    (5)在配置文件中开启组件扫描和AOP的自动代理

    (6)测试

     原先的bean在xml中配的,现在的bean用注解配了

    案例:

     目标接口和目标类

    TargetInterface.java

    package com.company.anno;
    
    public interface TargetInterface {
        void  save();
    }
    

      Target.java

    package com.company.anno;
    
    import org.springframework.stereotype.Component;
    
    @Component("targetInterface")
    public class Target implements TargetInterface {
        public void save() {
            System.out.println("save running ...");
        }
    }
    

      MyAspect.java

    package com.company.anno;
    
    import org.aspectj.lang.annotation.After;
    import org.aspectj.lang.annotation.Aspect;
    import org.aspectj.lang.annotation.Before;
    import org.springframework.stereotype.Component;
    
    @Component("MyAspect")
    @Aspect // 标注当前MyAspect是一个切面类
    public class MyAspect {
        // 配置前置通知
        @Before("execution(* com.company.anno.*.*(..))")
        public void before() {
            System.out.println("前置增强........");
        }
        @After("execution(* com.company.anno.*.*(..))")
        public void afterReturning() {
            System.out.println("后置增强");
        }
    }
    

     applicationContext-anno.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"
           xmlns:context="http://www.springframework.org/schema/context"
           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
           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
    ">
    
        <!--开启组件扫描-->
        <context:component-scan base-package="com.company.anno"/>
        <!--aop自动代理-->
        <aop:aspectj-autoproxy/>
    </beans>

    AnnoTest.java

    package com.company.test;
    
    import com.company.anno.TargetInterface;
    
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.test.context.ContextConfiguration;
    import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
    
    @RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration("classpath:applicationContext-anno.xml")
    public class AnnoTest {
        @Autowired
        private TargetInterface targetInterface;
        @Test
        public void test1() {
            targetInterface.save();
        }
    
    }
    

      运行结果:

    2.注解通知种类

    通知的配置语法:@通知注解(“切点表达式”)

     

     

    3.切点表达式的抽取

     同xml配置aop一样,我们可以将切点表达式抽取。抽取方式是在切面内定义方法,在该方法上使用@Pointcut注解定义切点表达式,然后再在增强注解中进行引用。具体如下:

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  • 原文地址:https://www.cnblogs.com/GumpYan/p/14189883.html
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