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ipipmanipipman
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add custom springboot event listener
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‎springboot-source-code-analysis/(8)自定义监听器实战.md

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### 自定义监听器实战
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![image-20210921163734877](/Users/huangyan110110114/Library/Application Support/typora-user-images/image-20210921163734877.png)
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![image-20210921163836397](/Users/huangyan110110114/Library/Application Support/typora-user-images/image-20210921163836397.png)
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![image-20210921163902692](/Users/huangyan110110114/Library/Application Support/typora-user-images/image-20210921163902692.png)

‎springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/SpringbootSourceCodeAnalysisApplication.java

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package com.example.springboot.source.code.analysis;
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import com.example.springboot.source.code.analysis.initializer.SecondInitializer;
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import com.example.springboot.source.code.analysis.listener.SecondListener;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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// 手动添加一个框架的初始化器
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springApplication.addInitializers(new SecondInitializer());
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// 手动添加一个框架事件监听器
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springApplication.addListeners(new SecondListener());
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springApplication.run();
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}

‎springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/listener/FirstListener.java

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package com.example.springboot.source.code.analysis.listener;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.boot.context.event.ApplicationStartedEvent;
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import org.springframework.context.ApplicationListener;
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import org.springframework.core.annotation.Order;
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/**
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* Created by ipipman on 2021/9/21.
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*
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* @version V1.0
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* @Package com.example.springboot.source.code.analysis.listener
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* @Description: (用一句话描述该文件做什么)
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* @date 2021/9/21 4:12 下午
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*/
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@Order(1)
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public class FirstListener implements ApplicationListener<ApplicationStartedEvent> {
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private final static Logger logger = LoggerFactory.getLogger(FirstListener.class);
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@Override
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public void onApplicationEvent(ApplicationStartedEvent event) {
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logger.info("设置框架事件监听器【ApplicationListener】成功 : run firstListener");
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}
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}

‎springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/listener/FourthListener.java

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package com.example.springboot.source.code.analysis.listener;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.boot.context.event.ApplicationPreparedEvent;
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import org.springframework.boot.context.event.ApplicationStartedEvent;
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import org.springframework.context.ApplicationEvent;
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import org.springframework.context.event.SmartApplicationListener;
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import org.springframework.core.annotation.Order;
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/**
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* Created by ipipman on 2021/9/21.
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*
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* @version V1.0
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* @Package com.example.springboot.source.code.analysis.listener
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* @Description: (用一句话描述该文件做什么)
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* @date 2021/9/21 4:26 下午
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*/
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@Order(4)
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public class FourthListener implements SmartApplicationListener {
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private final static Logger logger = LoggerFactory.getLogger(FourthListener.class);
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@Override
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public boolean supportsEventType(Class<? extends ApplicationEvent> eventType) {
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return ApplicationStartedEvent.class.isAssignableFrom(eventType)
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|| ApplicationPreparedEvent.class.isAssignableFrom(eventType);
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}
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@Override
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public void onApplicationEvent(ApplicationEvent event) {
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logger.info("设置框架事件监听器【SmartApplicationListener】成功 : run fourthListener");
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}
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}

‎springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/listener/SecondListener.java

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package com.example.springboot.source.code.analysis.listener;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.boot.context.event.ApplicationStartedEvent;
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import org.springframework.context.ApplicationListener;
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import org.springframework.core.annotation.Order;
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/**
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* Created by ipipman on 2021/9/21.
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*
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* @version V1.0
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* @Package com.example.springboot.source.code.analysis.listener
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* @Description: (用一句话描述该文件做什么)
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* @date 2021/9/21 4:19 下午
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*/
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@Order(2)
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public class SecondListener implements ApplicationListener<ApplicationStartedEvent> {
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private static final Logger logger = LoggerFactory.getLogger(SecondListener.class);
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@Override
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public void onApplicationEvent(ApplicationStartedEvent event) {
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logger.info("设置框架事件监听器【ApplicationListener】成功 : run secondListener");
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}
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}

‎springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/listener/ThirdListener.java

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package com.example.springboot.source.code.analysis.listener;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.boot.context.event.ApplicationStartedEvent;
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import org.springframework.context.ApplicationListener;
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import org.springframework.core.annotation.Order;
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/**
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* Created by ipipman on 2021/9/21.
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*
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* @version V1.0
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* @Package com.example.springboot.source.code.analysis.listener
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* @Description: (用一句话描述该文件做什么)
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* @date 2021/9/21 4:21 下午
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*/
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@Order(3)
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public class ThirdListener implements ApplicationListener<ApplicationStartedEvent> {
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private final static Logger logger = LoggerFactory.getLogger(ThirdListener.class);
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@Override
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public void onApplicationEvent(ApplicationStartedEvent event) {
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logger.info("设置框架事件监听器【ApplicationListener】成功 : run thirdListener");
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}
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}

‎springboot-source-code-analysis/src/main/resources/META-INF/spring.factories

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org.springframework.context.ApplicationContextInitializer=\
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com.example.springboot.source.code.analysis.initializer.FirstInitializer
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# 通过系统事件监听器，设置自定义事件监听器
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org.springframework.context.ApplicationListener=\
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com.example.springboot.source.code.analysis.listener.FirstListener

‎springboot-source-code-analysis/src/main/resources/application.properties

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# 通过系统初始化器，设置环境属性
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context.initializer.classes=\
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com.example.springboot.source.code.analysis.initializer.ThirdInitializer
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# 通过系统事件监听器，监听事件
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context.listener.classes=\
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com.example.springboot.source.code.analysis.listener.ThirdListener,\
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com.example.springboot.source.code.analysis.listener.FourthListener

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