目录
快速入门,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
其中Target类下
- package anno;
- import org.springframework.stereotype.Component;
-
- //交给spring容器,起个名为target
- @Component("target")
- public class Target implements TargetInterface {
-
- public void save() {
- System.out.println("save running。。。");
- }
- }
-
Interface类下
- package anno;
-
-
- public interface TargetInterface {
- public void save();
- }
MyAspect切面类下
- package anno;
-
- import org.aspectj.lang.annotation.Aspect;
- import org.aspectj.lang.annotation.Before;
- import org.springframework.stereotype.Component;
-
- //交给spring容器
- @Component("myAspect")
- @Aspect //标注当前MyAspect是一个切面类
- public class MyAspect {
- @Before("execution(* anno.*.*(..))")
- public void before(){
- System.out.println("前置增强....");
- }
-
- }
AnnoTest测试类下
- package anno;
-
- 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 target;
-
- @Test
- public void test1(){
- target.save();
- }
-
- }
applicationContext_anno.xml配置文件
- <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
- ">
-
- <context:component-scan base-package="anno"/>
-
- <aop:aspectj-autoproxy/>
-
- beans>
运行结果

通知的配置语法:@通知注解("切点表达式")

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,早该方法上使用@Pointcut注解定义切点表达式,然后在在增强注解中进行引用。
切面类中
- package anno;
-
- import org.aspectj.lang.annotation.AfterReturning;
- import org.aspectj.lang.annotation.Aspect;
- import org.aspectj.lang.annotation.Before;
- import org.aspectj.lang.annotation.Pointcut;
- import org.springframework.stereotype.Component;
-
- //交给spring容器
- @Component("myAspect")
- @Aspect //标注当前MyAspect是一个切面类
- public class MyAspect {
- @Before("execution(* anno.*.*(..))")
- public void before(){
- System.out.println("前置增强....");
- }
- //引入切点表达式方法
- @AfterReturning("pointcut()")//或者写MyAspect.pointcut()
- public void afterReturn(){
- System.out.println("后置增强....");
- }
-
- //定义切点表达式方法
- @Pointcut("execution(* anno.*.*(..))")
- public void pointcut(){ }
-
-
- }
运行结果
