service层AOP(基于注解的方法切入）

Posted 2022-11-13 星力量

service层AOP(基于注解的方法切入）

一、导入Maven依赖包

<!-- AOP Pointcut -->
<dependency>
    <groupId>org.aspectj</groupId>    

    <artifactId>aspectjweaver</artifactId>    

    <version>1.8.9</version>

</dependency>

<dependency>    

  <groupId>cglib</groupId>    

  <artifactId>cglib</artifactId>    

  <version>2.2.2</version>

</dependency>

二、spring 配置文件

<!-- 启动对@AspectJ注解的支持 -->
<aop:aspectj-autoproxy/>
<aop:aspectj-autoproxy proxy-target-class="true" />

三、编写注解类 @interface ServiceAopAnn
import java.lang.annotation.*;

@Target(ElementType.PARAMETER, ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public  @interface ServiceAopAnno 
    String value()  default "";
    boolean required() default true;
  

四、编写AOP切面处理类 ServiceAspect
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Aspect@Componentpublic class ServiceAspect 
    protected Logger logger = LoggerFactory.getLogger(this.getClass());
    //Service层切点    
    @Pointcut("@annotation(ServiceAopAnno)")
    public void serviceAspect() 
    
    @Around("serviceAspect()")
    public void doAround(ProceedingJoinPoint joinPoint) throws Throwable 
        Object target = joinPoint.getTarget();
        Object[] args = joinPoint.getArgs();
        if(logger.isDebugEnabled())
            logger.debug("doAround_begin: target:  ,args: " ,target ,args);
        
	
	
	//TODO do something before proceed
   
    

   
        //do target.method
        try 
            Object obj = joinPoint.proceed();
         catch (Throwable e) 
            logger.error("doAround_proceed error:" + e.getMessage() , e);
            throw e;
        
		
	//TODO do something after proceed
        if(logger.isDebugEnabled())
            logger.debug("doAround_end: target:  ,args: " ,target ,args);
        
    
    

五、service实现类添加AOP切面注解
@Service("messageService")
public class MessageServiceImpl implements MessageService 

六、注意事项
1. 确认你的bean 是AopProxy代理的对象：
   AopUtils.isAopProxy()//
   AopUtils.isCglibProxy() //cglib
   AopUtils.isJdkDynamicProxy() //jdk动态代理 
2. context:component-scan 重复扫描（bean实例化多次）可能影响事务；
3. 基于类的代理而非接口，如果想代理父类的方法，可以用 execution(* com.sishuok.es..service..*+.*(..))
4. 切面只能添加到public方法上。