The four major components of springboot are: 1. auto-configuration component; 2. starter component; 3. springboot cli component; 4. actuator component.

Spring Boot is a new framework provided by the Pivotal team. It is designed to simplify the initial construction and development process of new Spring applications. The framework uses an ad hoc approach to configuration, eliminating the need for developers to define boilerplate configurations. In this way, Spring Boot strives to become a leader in the booming field of rapid application development.

The four major components of springboot

• auto-configuration:

  Auto-configuration is the core feature of Spring Boot. Its idea of ????convention over configuration gives Spring Boot powerful capabilities out of the box.
  

• starter:

  starter is a very important mechanism that can abandon the previous complicated configuration and integrate it into the starter. The user only needs By introducing the starter dependency in maven, SpringBoot can automatically scan the information to be loaded and start the corresponding default configuration. The starter allows us to get rid of the trouble of dealing with various dependent libraries and needing to configure various information. SpringBoot will automatically discover the required beans through the classes in the classpath path and register them in the IOC container. SpringBoot provides spring-boot-starter dependency modules for various scenarios of daily enterprise application development. All these dependent modules follow the conventional default configuration and allow us to adjust these configurations, that is, following the concept of "convention over configuration".
  

• springboot cli

  Spring Boot CLI (Command Line Interface) is a command line tool that you can use to quickly build Spring prototype applications. Through the Spring Boot CLI, we can quickly build a Spring Boot application by writing Groovy scripts and run it through the command line.

• actuator

  Actuator is a functional module provided by Springboot for introspection and monitoring of application systems. With the help of Actuator, developers can easily monitor certain aspects of the application system. View and make statistics on some monitoring indicators.
  

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package?com.gufang.annotation;

import?java.lang.annotation.Documented;
import?java.lang.annotation.ElementType;
import?java.lang.annotation.Retention;
import?java.lang.annotation.RetentionPolicy;
import?java.lang.annotation.Target;

/**
?*?Enable?Gufang?DevTool?for?spring?boot?application
?*?
?*?@author?chen.qixiang
?*?@version?1.0.0
?*?@since?1.0.0
?*/
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public?@interface?EnableGufangConfiguration?{

}

##

package?com.gufang.boot;

import?org.springframework.beans.factory.annotation.Autowired;
import?org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import?org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import?org.springframework.boot.context.properties.EnableConfigurationProperties;
import?org.springframework.context.annotation.Bean;
import?org.springframework.context.annotation.Configuration;

import?com.gufang.annotation.EnableGufangConfiguration;

@Configuration
@ConditionalOnBean(annotation?=?EnableGufangConfiguration.class)
@EnableConfigurationProperties(GufangProperties.class)
public?class?GufangConfiguration?{
	??@Autowired
	??private?GufangProperties?properties;

	??@Bean
	??public?Object?createBean()
	??{
		??System.out.println("Gufang="+properties);
		??return?new?Object();
	??}
}

package?com.gufang.boot.context.event;
import?org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import?org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent;
import?org.springframework.context.ApplicationListener;

import?com.gufang.annotation.EnableGufangConfiguration;
public?class?GufangBannerApplicationListener?implements?
	ApplicationListener<applicationenvironmentpreparedevent>
{
	public?static?String?gufangLogo?=
	????????"??######################################################################################?\n"?+
????????????"??########????????#?????????????#???????????????????????????????????????????????########?\n"?+
????????????"??########???########???????#########???????????###?#???#???####??#####??#####??########?\n"?+
????????????"??########??????#?????????????#????????????????#????#???#???##????#??????#???#??########?\n"?+
????????????"??########????#####??????????######????????????#?#??#???#???#??#??#####??#####??########?\n"?+
????????????"??########???#???#??????????#????#???????????????#??#???#????#?#??#??????#?#????########?\n"?+
????????????"??########??#####??????????#????#?????????????#?#???#?#?#???####??#####??#???#??########?\n"?+
????????????"??######################################################################################?\n"?+
????????????"?????????????????????????????????????????????????????????????\n"?+
????????????"\n";
	public?static?String?LINE_SEPARATOR?=?System.getProperty("line.separator");
	@Override
	public?void?onApplicationEvent(ApplicationEnvironmentPreparedEvent?event)?{
		System.out.println(buildBannerText());
	}
	private?String?buildBannerText()?{
		StringBuilder?bannerTextBuilder?=?new?StringBuilder();
		bannerTextBuilder.append(LINE_SEPARATOR).append(gufangLogo).append("?::?Gufang?::????????(v1.0.0)")
		.append(LINE_SEPARATOR);
		return?bannerTextBuilder.toString();
	}
}</applicationenvironmentpreparedevent>

spring.factories

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.gufang.boot.GufangConfiguration

org.springframework.context.ApplicationListener=\
com.gufang.boot.context.event.GufangBannerApplicationListener

provides:?gufang-spring-boot-starter

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