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13-注解方式实现aop-快速入门

发布时间：2025-01-18 19:06:21编辑：雪饮阅读（）

首先建立targe接口
package sp21.annotation;

public interface TargetInterface {
    public void save();
}
 
然后建立target
package sp21.annotation;

import org.springframework.stereotype.Component;

@Component("target")
public class Target implements TargetInterface {
    public void save() {
        int i=1/0;
        System.out.println("save running...");
    }
}
然后建立切面类并标注为切面类，但增强暂时先标注前置增强
package sp21.annotation;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;

@Component("myAspect")
/*
* Aspect注解标注当前类是一个切面类
* */
@Aspect
public class MyAspect {
    //配置前置通知
    @Before(value="execution(* sp21.annotation.Target.save())")
    public void before(){
        System.out.println("前置增强....");
    }
    public void afterReturning(){
        System.out.println("后置增强....");
    }
    public Object around(ProceedingJoinPoint pjp) throws Throwable {
        System.out.println("环绕前增强....");
        Object proceed=pjp.proceed();

        System.out.println("环绕后增强....");
        return  proceed;
    }
    public void afterThrowing(){
        System.out.println("异常抛出增强......");
    }
    public void after(){
        System.out.println("最终增强....");
    }
}
然后建立Spring配置文件，但这里为了注解方式单独建立的如application-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:context="http://www.springframework.org/schema/context"
       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/context http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
">
    <!--组件扫描-->
<context:component-scan base-package="sp21.annotation"/>
    <!--aop自动代理-->
    <aop:aspectj-autoproxy/>
</beans>
然后建立测试类及测试方法
package sp21;

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;
import sp21.annotation.TargetInterface;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:application-anno.xml")
public class AopAnnotationTest {
    @Autowired
    private TargetInterface target;
    @Test
    public void test1(){
        target.save();
    }
}