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一、新建个工程选择Spring Initializr模式勾选web选项

1.1、创建的工程的pom.xml内容如下：

   
       
    
     4.0.0
        
    
     com.example
        
    
     chapter
        
    
     0.0.1-SNAPSHOT
        
    
     jar
        
    
     chapter
        
    
     Demo project for Spring Boot
        
            
     
      org.springframework.boot
             
     
      spring-boot-starter-parent
             
     
      2.1.0.RELEASE
             
      
         
        
            
     
      UTF-8
             
     
      UTF-8
             
     
      1.8
         
        
            
                 
      
       org.springframework.boot
                  
      
       spring-boot-starter-web
              
             
                 
      
       org.springframework.boot
                  
      
       spring-boot-starter-test
                  
      
       test
              
         
        
            
                 
                      
       
        org.springframework.boot
                       
       
        spring-boot-maven-plugin
                   
              
         
    
   

1.2、项目结构如下：

1.3、启动类的定义如下：

package com.example;import org.springframework.boot.CommandLineRunner;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.context.ApplicationContext;import org.springframework.context.annotation.Bean;import java.util.Arrays;@SpringBootApplicationpublic class ChapterApplication {    public static void main(String[] args) {        SpringApplication.run(ChapterApplication.class, args);    }    @Bean    public CommandLineRunner commandLineRunner(ApplicationContext ctx) {        // 目的是        return args -> {            System.out.println("来看看 SpringBoot 默认为我们提供的 Bean：");            String[] beanNames = ctx.getBeanDefinitionNames();            Arrays.sort(beanNames);            Arrays.stream(beanNames).forEach(System.out::println);        };    }}

1.4、启动之后springboot自动注入了很多个bean：

来看看 SpringBoot 默认为我们提供的 Bean：applicationTaskExecutorbasicErrorControllerbeanNameHandlerMappingbeanNameViewResolverchapterApplicationcharacterEncodingFiltercommandLineRunnerconventionErrorViewResolverdefaultServletHandlerMappingdefaultValidatordefaultViewResolverdemoControllerdispatcherServletdispatcherServletRegistrationerrorerrorAttributeserrorPageCustomizererrorPageRegistrarBeanPostProcessorfaviconHandlerMappingfaviconRequestHandlerformContentFilterhandlerExceptionResolverhiddenHttpMethodFilterhttpRequestHandlerAdapterjacksonCodecCustomizerjacksonObjectMapperjacksonObjectMapperBuilderjsonComponentModulelocaleCharsetMappingsCustomizerloggingCodecCustomizermappingJackson2HttpMessageConvertermbeanExportermbeanServermessageConvertersmethodValidationPostProcessormultipartConfigElementmultipartResolvermvcContentNegotiationManagermvcConversionServicemvcHandlerMappingIntrospectormvcPathMatchermvcResourceUrlProvidermvcUriComponentsContributormvcUrlPathHelpermvcValidatormvcViewResolverobjectNamingStrategyorg.springframework.boot.autoconfigure.AutoConfigurationPackagesorg.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfigurationorg.springframework.boot.autoconfigure.condition.BeanTypeRegistryorg.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfigurationorg.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfigurationorg.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfigurationorg.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration$StringHttpMessageConverterConfigurationorg.springframework.boot.autoconfigure.http.JacksonHttpMessageConvertersConfigurationorg.springframework.boot.autoconfigure.http.JacksonHttpMessageConvertersConfiguration$MappingJackson2HttpMessageConverterConfigurationorg.springframework.boot.autoconfigure.http.codec.CodecsAutoConfigurationorg.springframework.boot.autoconfigure.http.codec.CodecsAutoConfiguration$JacksonCodecConfigurationorg.springframework.boot.autoconfigure.http.codec.CodecsAutoConfiguration$LoggingCodecConfigurationorg.springframework.boot.autoconfigure.info.ProjectInfoAutoConfigurationorg.springframework.boot.autoconfigure.internalCachingMetadataReaderFactoryorg.springframework.boot.autoconfigure.jackson.JacksonAutoConfigurationorg.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$Jackson2ObjectMapperBuilderCustomizerConfigurationorg.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$JacksonObjectMapperBuilderConfigurationorg.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$JacksonObjectMapperConfigurationorg.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$ParameterNamesModuleConfigurationorg.springframework.boot.autoconfigure.jmx.JmxAutoConfigurationorg.springframework.boot.autoconfigure.task.TaskExecutionAutoConfigurationorg.springframework.boot.autoconfigure.task.TaskSchedulingAutoConfigurationorg.springframework.boot.autoconfigure.validation.ValidationAutoConfigurationorg.springframework.boot.autoconfigure.web.client.RestTemplateAutoConfigurationorg.springframework.boot.autoconfigure.web.embedded.EmbeddedWebServerFactoryCustomizerAutoConfigurationorg.springframework.boot.autoconfigure.web.embedded.EmbeddedWebServerFactoryCustomizerAutoConfiguration$TomcatWebServerFactoryCustomizerConfigurationorg.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfigurationorg.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration$DispatcherServletConfigurationorg.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration$DispatcherServletRegistrationConfigurationorg.springframework.boot.autoconfigure.web.servlet.HttpEncodingAutoConfigurationorg.springframework.boot.autoconfigure.web.servlet.MultipartAutoConfigurationorg.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryAutoConfigurationorg.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryConfiguration$EmbeddedTomcatorg.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfigurationorg.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$EnableWebMvcConfigurationorg.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapterorg.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter$FaviconConfigurationorg.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfigurationorg.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration$DefaultErrorViewResolverConfigurationorg.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration$WhitelabelErrorViewConfigurationorg.springframework.boot.autoconfigure.websocket.servlet.WebSocketServletAutoConfigurationorg.springframework.boot.autoconfigure.websocket.servlet.WebSocketServletAutoConfiguration$TomcatWebSocketConfigurationorg.springframework.boot.context.properties.ConfigurationBeanFactoryMetadataorg.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessororg.springframework.context.annotation.internalAutowiredAnnotationProcessororg.springframework.context.annotation.internalCommonAnnotationProcessororg.springframework.context.annotation.internalConfigurationAnnotationProcessororg.springframework.context.event.internalEventListenerFactoryorg.springframework.context.event.internalEventListenerProcessorparameterNamesModulepreserveErrorControllerTargetClassPostProcessorpropertySourcesPlaceholderConfigurerrequestContextFilterrequestMappingHandlerAdapterrequestMappingHandlerMappingresourceHandlerMappingrestTemplateBuilderserver-org.springframework.boot.autoconfigure.web.ServerPropertiesservletWebServerFactoryCustomizersimpleControllerHandlerAdapterspring.http-org.springframework.boot.autoconfigure.http.HttpPropertiesspring.info-org.springframework.boot.autoconfigure.info.ProjectInfoPropertiesspring.jackson-org.springframework.boot.autoconfigure.jackson.JacksonPropertiesspring.mvc-org.springframework.boot.autoconfigure.web.servlet.WebMvcPropertiesspring.resources-org.springframework.boot.autoconfigure.web.ResourcePropertiesspring.servlet.multipart-org.springframework.boot.autoconfigure.web.servlet.MultipartPropertiesspring.task.execution-org.springframework.boot.autoconfigure.task.TaskExecutionPropertiesspring.task.scheduling-org.springframework.boot.autoconfigure.task.TaskSchedulingPropertiesspringApplicationAdminRegistrarstandardJacksonObjectMapperBuilderCustomizerstringHttpMessageConvertertaskExecutorBuildertaskSchedulerBuildertomcatServletWebServerFactorytomcatServletWebServerFactoryCustomizertomcatWebServerFactoryCustomizerviewControllerHandlerMappingviewResolverwebServerFactoryCustomizerBeanPostProcessorwebsocketServletWebServerCustomizerwelcomePageHandlerMapping

1.5、创建个控制器类，定义如下：

package com.example.controller;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;/** * @author xiaobu * @version JDK1.8.0_171 * @date on  2018/11/13 17:20 * @description V1.0 */@RestController@RequestMapping("/demo")public class DemoController {    @GetMapping("demo")    public String demo(){        return "Hi,我是admin";    }}

访问 出现如下结果：

二、打包运行项目

2.1、CMD进入工程目录下（我的项目路径E:\Practise\SpringBoot\chapter）

E:cd  E:\Practise\SpringBoot\chapter#执行打包命令mvn package#进入target目录下cd E:\Practise\SpringBoot\chapter\target#后面是更改环境，没有可以忽略java -jar chapter2-0.0.1-SNAPSHOT.jar --spring.profiles.active=test

执行完打包进入target目录下会新增两个打包文件：

然后继续访问 也会出现一样的效果。（确保端口不被占用）

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