SpringBoot几个重要的事件回调、监听机制

（1）、需要配置在META-INF/Spring.factories

　　1.ApplicationContextInitializer

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 6 package org.springframework.context;
 7 
 8 public interface ApplicationContextInitializer<C extends ConfigurableApplicationContext> {
 9     //监听ioc容器启动
10     void initialize(C var1);
11 }

　　2.SpringApplicationRunListener

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 6 package org.springframework.boot;
 7 
 8 import org.springframework.context.ConfigurableApplicationContext;
 9 import org.springframework.core.env.ConfigurableEnvironment;
10 
11 public interface SpringApplicationRunListener {
12     //监听容器开始
13     void starting();
14     //SpringBoot环境准备好
15     void environmentPrepared(ConfigurableEnvironment environment);
16     //ioc容器准备好了
17     void contextPrepared(ConfigurableApplicationContext context);
18     //容器环境加载完成
19     void contextLoaded(ConfigurableApplicationContext context);
20 
21     void started(ConfigurableApplicationContext context);
22 
23     void running(ConfigurableApplicationContext context);
24     //SpringBoot创建完成
25     void failed(ConfigurableApplicationContext context, Throwable exception);
26 }

（2）、只需要放到ioc容器中即可

　　1.ApplicationRunner

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 6 package org.springframework.boot;
 7 
 8 @FunctionalInterface
 9 public interface ApplicationRunner {
10     void run(ApplicationArguments args) throws Exception;
11 }

　　2.CommandLineRunner

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 6 package org.springframework.boot;
 7 
 8 @FunctionalInterface
 9 public interface CommandLineRunner {
10     void run(String... args) throws Exception;
11 }