springboot的四大组件是什么？

springboot的四大组件为：1、auto-configuration组件；2、starter组件；3、springboot cli组件；4、actuator组件。

Spring Boot是由Pivotal团队提供的全新框架，其设计目的是用来简化新Spring应用的初始搭建以及开发过程。该框架使用了特定的方式来进行配置，从而使开发人员不再需要定义样板化的配置。通过这种方式，Spring Boot致力于在蓬勃发展的快速应用开发领域(rapid application development)成为领导者。

springboot的四大组件

• auto-configuration：

• starter：

• springboot cli

  Spring Boot CLI（Command Line Interface）是一个命令行工具，您可以用它来快速构建Spring原型应用。通过Spring Boot CLI，我们可以通过编写Groovy脚本来快速的构建出Spring Boot应用，并通过命令行的方式将其运行起来。

• actuator

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(); 	} }

spring.factories

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

spring.provides

provides: gufang-spring-boot-starter

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