Spring and AOP

作为AOP入门基础的学习材料，大家可以参考这个。 @AspectJ Based AOP with Spring 我自己是参考《Spring实战》的。

不废话，先贴上代码：

<dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjrt</artifactId> <version>1.8.10</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.8.10</version> </dependency>

接下来是切面（切点+通知）

package com.banana.oa.aop; import org.aspectj.lang.annotation.AfterReturning; import org.aspectj.lang.annotation.AfterThrowing; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.annotation.Pointcut; import org.slf4j.Logger; import org.slf4j.LoggerFactory; @Aspect public class Audience { private static Logger logger = LoggerFactory.getLogger(Audience.class); @Pointcut("execution(* com.banana.oa.aop.Performance.perform(..))") public void performance() {} @Before("performance()") public void silenceCellPhone() { logger.info("silence cell phone"); } @Before("performance()") public void takeSeats() { logger.info("take seats"); } @AfterReturning("performance()") public void applause() { logger.info("CLAP CLAP CLAP"); } @AfterThrowing("performance()") public void demandRefund() { logger.info("Demanding a refund"); } }

切点的具体类：

package com.banana.oa.aop; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class Performance { private static final Logger logger = LoggerFactory.getLogger(Performance.class); public void perform() { logger.info("perform ..."); } }

Bean配置，我自己比较喜欢使用Java配置，而且类型也跟安全。需要注意的是要加上@EnableAspectJAutoProxy 注解。

package com.banana.oa.spring; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.EnableAspectJAutoProxy; import com.banana.oa.aop.Audience; import com.banana.oa.aop.Performance; @Configuration @EnableAspectJAutoProxy public class AopConfig { @Bean public Audience audience() { return new Audience(); } @Bean public Performance performance() { return new Performance(); } }

Unit Test类，需要注意的是，这里的Performance需要通过注入的方式装配进来，自己new的对象会达不到AOP效果。

package com.banana.oa.service; import org.junit.Test; import org.springframework.beans.factory.annotation.Autowired; import com.banana.oa.aop.Performance; public class PerformanceTest extends BaseTest { /* * AOP test * must be provided in inject way, otherwise AOP won't work if we new a Performance object */ @Autowired private Performance performance; @Test public void testPerform() { performance.perform(); } }