解決spring boot啟動掃描不到自定義註解的問題
阿新 • • 發佈:2020-09-27
對於自定義註解這裡就不嘮叨了,百度一大堆,這裡有我一個自定義註解
@Retention(RetentionPolicy.RUNTIME) @Target({ ElementType.METHOD }) public @interface MsgEvent { RetailOrderEvent msgEvent(); }
註解實現類
@Component public class MsgEventProcessor implements BeanPostProcessor { /** * 事件訊息註解與例項Bean的對映物件 */ public static Map<String,ServiceBean> EVENTCODESERVICEBEANMAP = new HashMap<String,ServiceBean>(); @Override public Object postProcessBeforeInitialization(Object bean,String beanName) throws BeansException { return bean; } @Override public Object postProcessAfterInitialization(Object bean,String beanName) throws BeansException { Method[] methods = ReflectionUtils.getAllDeclaredMethods(bean.getClass()); if (methods != null) { for (Method method : methods) { MsgEvent myMsgEvent = AnnotationUtils.findAnnotation(method,MsgEvent.class); if (myMsgEvent != null) { String eventCode = myMsgEvent.msgEvent().eventCode(); ServiceBean servieBean = new ServiceBean(); servieBean.setServiceBeanObj(bean); servieBean.setServiceMethod(method); Class<?> argsCls = method.getParameterTypes()[0]; servieBean.setArgsCls(argsCls); EVENTCODESERVICEBEANMAP.put(eventCode,servieBean); } } } return bean; } }
呼叫者
@MsgEvent(msgEvent = RetailOrderEvent.PLACE_GENERALRETAILORDER) public Person getPerson(Person p) { return personMapper.getPerson(p.getId()); }
spring boot debug模式下啟動一直不會再程式碼紅色部分停下,說明沒有獲取到自定義註解
原因是發現bean為jdk代理
解決辦法
@SpringBootApplication @EnableAspectJAutoProxy(exposeProxy = true) public class Application { public static void main(String[] args) { SpringApplication.run(Application.class,args); } }
或者
@ImportResource(locations = { "classpath:spring-basic.xml" }) @SpringBootApplication //@EnableAspectJAutoProxy(exposeProxy = true) public class Application { public static void main(String[] args) { SpringApplication.run(Application.class,args); } }
spring-basic.xml
<?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:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd "> <!-- 配置使Spring採用CGLIB代理 --> <aop:aspectj-autoproxy expose-proxy="true" proxy-target-class="true" /> </beans>
上述會讓所有的都採用CGLIB代理,如果只想對使用的類採用,其他的還是原來的話就可以對註解使用類上標註@Configuration代替@Component
補充知識:解決Aspect註解基於註解的增強不生效的問題
Aspect基於註解的增強生效須滿足3個條件:
<!--1.代理方式設定為 cglib,預設false,則必須通過實現某個接口才能實現增強 --> <aop:aspectj-autoproxy proxy-target-class="true"/> <!--2.配置檔案中把須增強註解所在包掃描注入,或者配置 bean--> <context:component-scan base-package="註解所在包路徑"/> <!--3.配置檔案中把@Aspect註解所在類對應包掃描注入 或者配置bean--> <context:component-scan base-package="aspect註解所在包路徑"/>
ps : 若在 controller 層使用,則controller 也需要配置上邊兩個條件方能生效
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