service层AOP(基于注解的方法切入）

service层AOP(基于注解的方法切入）

一、导入Maven依赖包

<dependency>

< groupId >org.aspectj groupId >  

    <artifactId>aspectjweaverartifactId>    

    <version>1.8.9version>

dependency>

<dependency>    

  <groupId>cglibgroupId>    

  <artifactId>cglibartifactId>    

  <version>2.2.2version>

dependency>

二、spring 配置文件

<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 @Component public 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。