一、启动过程

---

二、自定义组件

---

package com.example.jdbc.listener;
import org.springframework.context.ApplicationContextInitializer;
import org.springframework.context.ConfigurableApplicationContext;

public class HelloApplicationContextInitiallizer implements ApplicationContextInitializer {
@Override
public void initialize(ConfigurableApplicationContext configurableApplicationContext) {
System.out.println("HelloApplicationContextInitiallizer.initialize");
}
}

package com.example.jdbc.listener;

import org.springframework.boot.SpringApplicationRunListener;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.env.ConfigurableEnvironment;

public class HelloSpringApplicationRunListener implements SpringApplicationRunListener {

@Override  
public void environmentPrepared(ConfigurableEnvironment environment) {  
    System.out.println("HelloSpringApplicationRunListener...environmentPrepared...");  
}

@Override  
public void contextPrepared(ConfigurableApplicationContext context) {  
    System.out.println("HelloSpringApplicationRunListener.contextPrepared");  
}

@Override  
public void contextLoaded(ConfigurableApplicationContext context) {  
    System.out.println("HelloSpringApplicationRunListener.contextLoaded");  
}

@Override  
public void started(ConfigurableApplicationContext context) {  
    System.out.println("HelloSpringApplicationRunListener.started");  
}

@Override  
public void running(ConfigurableApplicationContext context) {  
    System.out.println("HelloSpringApplicationRunListener.running");  
}

@Override  
public void failed(ConfigurableApplicationContext context, Throwable exception) {  
    System.out.println("HelloSpringApplicationRunListener.failed");  
}

@Override  
public void starting() {  
    System.out.println("HelloSpringApplicationRunListener.starting");  
}  

}

/src/main/resources/META-INF/spring.factories

org.springframework.context.ApplicationContextInitializer=\
com.example.jdbc.listener.HelloApplicationContextInitiallizer

org.springframework.context.ApplicationListener=\
com.example.jdbc.listener.HelloSpringApplicationRunListener

以上两个组件在项目启动过程中未能够成功执行，待解

以下两个组件成功加载并在项目启东时执行

---

package com.example.jdbc.listener;

import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.stereotype.Component;

@Component
public class HelloApplicationRunner implements ApplicationRunner {

@Override  
public void run(ApplicationArguments args) throws Exception {  
    System.out.println("HelloApplicationRunner.run");  
}  

}

package com.example.jdbc.listener;

import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;
import java.util.Arrays;

@Component
public class HelloCommandLineRunner implements CommandLineRunner {
@Override
public void run(String… args) throws Exception {
System.out.println("HelloCommandLineRunner.run" + Arrays.asList(args));
}
}