前言
本文主要給大家介紹了關(guān)于spring boot應(yīng)用事件監(jiān)聽的相關(guān)內(nèi)容，分享出來(lái)供大家參考學(xué)習(xí)，下面話不多說了，來(lái)一起看看詳細(xì)的介紹吧
1. spring boot特有的應(yīng)用事件
除了spring框架的事件，spring boot的springapplication也發(fā)送了一些自己的事件：
- applicationstartingevent:在任何處理(除了注冊(cè)listener和initializer)開始之前發(fā)送。
- applicationenvironmentpreparedevent: 在context創(chuàng)建之前，而用到context中的environment已經(jīng)被識(shí)別時(shí)發(fā)送。
- applicationcontextinitializedevent: springapplication正在啟動(dòng)，applicationcontext已準(zhǔn)備好且applicationcontextinitializer已被調(diào)用但是bean的定義還沒有被加載時(shí)發(fā)送。
- applicationpreparedevent: 在context刷新之前，在bean的定義已經(jīng)被加載之后調(diào)用。
- applicationstartedevent: 在任何應(yīng)用和command-line runner調(diào)用之前，而context已經(jīng)被刷新時(shí)發(fā)送。
- applicationreadyevent: 在任何應(yīng)用和command-line runner被調(diào)用的時(shí)候發(fā)送，它意味著應(yīng)用可以接受請(qǐng)求了。
- applicationfailedevent: 在啟動(dòng)時(shí)有異常的時(shí)候發(fā)送。
有些事件是在applicationcontext創(chuàng)建之前觸發(fā)的，所以我們不能用常規(guī)的注冊(cè)成bean的事件監(jiān)聽方式：
- 注解了@eventlistener注解分方法的類注冊(cè)的bean；
- 實(shí)現(xiàn)了applicationlistener<event>接口的類注冊(cè)的bean。
像applicationstartedevent和applicationreadyevent是applicationcontext創(chuàng)建之后觸發(fā)的，可以用上述兩種方式來(lái)監(jiān)聽事件。
2. 如何監(jiān)聽這些事件
我們可以通過下面的方式注冊(cè)監(jiān)聽：
2.1. springapplication.addlisteners(...)
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springapplication application = new springapplication(starteventsapplication.class);application.addlisteners( (applicationlistener<applicationstartingevent>) event -> log.info("----------- 監(jiān)聽spring boot:" + event.getclass().getsimplename()), (applicationlistener<applicationenvironmentpreparedevent>) event -> log.info("----------- 監(jiān)聽spring boot:" + event.getclass().getsimplename()), (applicationlistener<applicationcontextinitializedevent>) event -> log.info("----------- 監(jiān)聽spring boot:" + event.getclass().getsimplename()), (applicationlistener<applicationpreparedevent>) event -> log.info("----------- 監(jiān)聽spring boot:" + event.getclass().getsimplename()), (applicationlistener<applicationstartedevent>) event -> log.info("----------- 監(jiān)聽spring boot:" + event.getclass().getsimplename()), (applicationlistener<applicationreadyevent>) event -> log.info("----------- 監(jiān)聽spring boot:" + event.getclass().getsimplename()));application.run(args); |
2.2. springapplicationbuilder.listeners(...)
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new springapplicationbuilder() .sources(starteventsapplication.class) .listeners( (applicationlistener<applicationstartingevent>) event -> log.info("----------- 監(jiān)聽spring boot:" + event.getclass().getsimplename()), (applicationlistener<applicationenvironmentpreparedevent>) event -> log.info("----------- 監(jiān)聽spring boot:" + event.getclass().getsimplename()), (applicationlistener<applicationcontextinitializedevent>) event -> log.info("----------- 監(jiān)聽spring boot:" + event.getclass().getsimplename()), (applicationlistener<applicationpreparedevent>) event -> log.info("----------- 監(jiān)聽spring boot:" + event.getclass().getsimplename()), (applicationlistener<applicationstartedevent>) event -> log.info("----------- 監(jiān)聽spring boot:" + event.getclass().getsimplename()), (applicationlistener<applicationreadyevent>) event -> log.info("----------- 監(jiān)聽spring boot:" + event.getclass().getsimplename()) ) .run(args); |
2.3. meta-inf/spring.factories
src/main/resources/meta-inf/spring.factories：
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org.springframework.context.applicationlistener=top.wisely.startevents.listeners.applicationcontextinitializedeventlistener, \ top.wisely.startevents.listeners.applicationenvironmentpreparedeventlistener, \ top.wisely.startevents.listeners.applicationpreparedeventlistener, \ top.wisely.startevents.listeners.applicationreadyeventlistener, \ top.wisely.startevents.listeners.applicationstartedeventlistener, \ top.wisely.startevents.listeners.applicationstartingeventlistener |
監(jiān)聽器只需實(shí)現(xiàn)applicationlistener<要監(jiān)聽的接口類型>接口，無(wú)需手動(dòng)注冊(cè)為bean:
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public class applicationstartedeventlistener implements applicationlistener<applicationstartedevent> { @override public void onapplicationevent(applicationstartedevent event) { log.info("----------- 監(jiān)聽spring boot:" + event.getclass().getsimplename()); }} |
3. 源碼地址
https://github.com/wiselyman/spring-boot-application-events.git
總結(jié)
以上就是這篇文章的全部?jī)?nèi)容了，希望本文的內(nèi)容對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值，如果有疑問大家可以留言交流，謝謝大家對(duì)服務(wù)器之家的支持。
原文鏈接：http://www.wisely.top/2018/12/04/spring-boot-application-events/
