本文用于知识点的简单总结。
对于Spring中AOP的配置,第二种方式是基于@AspectJ风格的注解方式,相关配置项在代码中定义。以下主要通过代码说明基本配置流程。
(1)定义需要实现的业务接口:
package com.aop.service; public interface MyService { public void sayHello(String word); }
(2)编写实现接口的业务类:
package com.aop.service; public class MyServiceImpl implements MyService { @Override public void sayHello(String word) { System.out.println("Say :" + word); } }
(3)切点、切面、通知等相关配置:
package com.aop.aspect; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.annotation.Pointcut; //切面声明 @Aspect public class MyAspectJ { //切点声明 @Pointcut(value = "execution(* com.aop.service..*.*(..))&& args(param)", argNames = "param") public void MyPointCut(String param) { } //前置通知声明 @Before(value = "MyPointCut(param)", argNames = "param") public void beforeAdvice(String param) { System.out.println("--before advice,param:" + param); } }
(4)xml配置文件:
<?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-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"> <!-- 开启 @AspectJ 风格的切面声明 --> <aop:aspectj-autoproxy /> <!-- 接口实现业务类 --> <bean id="MyService" class="com.aop.service.MyServiceImpl" /> <!-- 切面定义类,包含切点、切面、通知等相关配置 --> <bean id="MyAspectJ" class="com.aop.aspect.MyAspectJ" /> </beans>
(5)测试类:
package com.spring.test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.FileSystemXmlApplicationContext; import com.aop.service.MyService; public class TestAop { public static void main(String[] args) { ApplicationContext context = new FileSystemXmlApplicationContext("aspectJAop.xml"); MyService service = (MyService) context.getBean("MyService"); service.sayHello("Spring aop"); } }
(6)输出结果:
--before advice,param:Spring aop Say :Spring aop