SpringBoot 默认为我们提供的 Bean

心已赠人 2022-01-17 07:55 252阅读 0赞

[为什么80%的码农都做不了架构师？>>> ][80_] ![hot3.png][]

### 1.SpringBoot[任意门][Link 1]，简单修改添加配置组件 ###

![a9c86fc4e4edb87d49da45a792797f879ae.jpg][]

### 2.生成一个简单的工程然后导入个人的IDE里（eclipse or Idea），如eclipse ###

![b42f512a6e1fa176462de02e2d46c828763.jpg][]

### 3.导入后编辑启动类DemoApplication ###

import java.util.Arrays;
    
    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 org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    @SpringBootApplication
    public class DemoApplication {
    
    	public static void main(String[] args) {
    		SpringApplication.run(DemoApplication.class, args);
    	}
    
    	@GetMapping("/demo1")
        public String demo1() {
            return "Hello battcn";
        }
    
        @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);
            };
        }
    }

### 4.启动SpringBoot项目查看控制台输出 ###

来看看 SpringBoot 默认为我们提供的 Bean：
    applicationTaskExecutor
    basicErrorController
    beanNameHandlerMapping
    beanNameViewResolver
    characterEncodingFilter
    commandLineRunner
    conventionErrorViewResolver
    defaultServletHandlerMapping
    defaultValidator
    defaultViewResolver
    demoApplication
    dispatcherServlet
    dispatcherServletRegistration
    error
    errorAttributes
    errorPageCustomizer
    errorPageRegistrarBeanPostProcessor
    faviconHandlerMapping
    faviconRequestHandler
    formContentFilter
    handlerExceptionResolver
    hiddenHttpMethodFilter
    httpRequestHandlerAdapter
    jacksonCodecCustomizer
    jacksonObjectMapper
    jacksonObjectMapperBuilder
    jsonComponentModule
    localeCharsetMappingsCustomizer
    loggingCodecCustomizer
    mappingJackson2HttpMessageConverter
    mbeanExporter
    mbeanServer
    messageConverters
    methodValidationPostProcessor
    multipartConfigElement
    multipartResolver
    mvcContentNegotiationManager
    mvcConversionService
    mvcHandlerMappingIntrospector
    mvcPathMatcher
    mvcResourceUrlProvider
    mvcUriComponentsContributor
    mvcUrlPathHelper
    mvcValidator
    mvcViewResolver
    objectNamingStrategy
    org.springframework.boot.autoconfigure.AutoConfigurationPackages
    org.springframework.boot.autoconfigure.condition.BeanTypeRegistry
    org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration
    org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration
    org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration
    org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration$StringHttpMessageConverterConfiguration
    org.springframework.boot.autoconfigure.http.JacksonHttpMessageConvertersConfiguration
    org.springframework.boot.autoconfigure.http.JacksonHttpMessageConvertersConfiguration$MappingJackson2HttpMessageConverterConfiguration
    org.springframework.boot.autoconfigure.http.codec.CodecsAutoConfiguration
    org.springframework.boot.autoconfigure.http.codec.CodecsAutoConfiguration$JacksonCodecConfiguration
    org.springframework.boot.autoconfigure.http.codec.CodecsAutoConfiguration$LoggingCodecConfiguration
    org.springframework.boot.autoconfigure.info.ProjectInfoAutoConfiguration
    org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory
    org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration
    org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$Jackson2ObjectMapperBuilderCustomizerConfiguration
    org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$JacksonObjectMapperBuilderConfiguration
    org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$JacksonObjectMapperConfiguration
    org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$ParameterNamesModuleConfiguration
    org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration
    org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration
    org.springframework.boot.autoconfigure.task.TaskSchedulingAutoConfiguration
    org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration
    org.springframework.boot.autoconfigure.web.client.RestTemplateAutoConfiguration
    org.springframework.boot.autoconfigure.web.embedded.EmbeddedWebServerFactoryCustomizerAutoConfiguration
    org.springframework.boot.autoconfigure.web.embedded.EmbeddedWebServerFactoryCustomizerAutoConfiguration$TomcatWebServerFactoryCustomizerConfiguration
    org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration
    org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration$DispatcherServletConfiguration
    org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration$DispatcherServletRegistrationConfiguration
    org.springframework.boot.autoconfigure.web.servlet.HttpEncodingAutoConfiguration
    org.springframework.boot.autoconfigure.web.servlet.MultipartAutoConfiguration
    org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryAutoConfiguration
    org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryConfiguration$EmbeddedTomcat
    org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration
    org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$EnableWebMvcConfiguration
    org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter
    org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter$FaviconConfiguration
    org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration
    org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration$DefaultErrorViewResolverConfiguration
    org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration
    org.springframework.boot.autoconfigure.websocket.servlet.WebSocketServletAutoConfiguration
    org.springframework.boot.autoconfigure.websocket.servlet.WebSocketServletAutoConfiguration$TomcatWebSocketConfiguration
    org.springframework.boot.context.properties.ConfigurationBeanFactoryMetadata
    org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor
    org.springframework.context.annotation.internalAutowiredAnnotationProcessor
    org.springframework.context.annotation.internalCommonAnnotationProcessor
    org.springframework.context.annotation.internalConfigurationAnnotationProcessor
    org.springframework.context.event.internalEventListenerFactory
    org.springframework.context.event.internalEventListenerProcessor
    parameterNamesModule
    preserveErrorControllerTargetClassPostProcessor
    propertySourcesPlaceholderConfigurer
    requestContextFilter
    requestMappingHandlerAdapter
    requestMappingHandlerMapping
    resourceHandlerMapping
    restTemplateBuilder
    server-org.springframework.boot.autoconfigure.web.ServerProperties
    servletWebServerFactoryCustomizer
    simpleControllerHandlerAdapter
    spring.http-org.springframework.boot.autoconfigure.http.HttpProperties
    spring.info-org.springframework.boot.autoconfigure.info.ProjectInfoProperties
    spring.jackson-org.springframework.boot.autoconfigure.jackson.JacksonProperties
    spring.mvc-org.springframework.boot.autoconfigure.web.servlet.WebMvcProperties
    spring.resources-org.springframework.boot.autoconfigure.web.ResourceProperties
    spring.servlet.multipart-org.springframework.boot.autoconfigure.web.servlet.MultipartProperties
    spring.task.execution-org.springframework.boot.autoconfigure.task.TaskExecutionProperties
    spring.task.scheduling-org.springframework.boot.autoconfigure.task.TaskSchedulingProperties
    standardJacksonObjectMapperBuilderCustomizer
    stringHttpMessageConverter
    taskExecutorBuilder
    taskSchedulerBuilder
    tomcatServletWebServerFactory
    tomcatServletWebServerFactoryCustomizer
    tomcatWebServerFactoryCustomizer
    viewControllerHandlerMapping
    viewResolver
    webServerFactoryCustomizerBeanPostProcessor
    websocketServletWebServerCustomizer
    welcomePageHandlerMapping

### 5.附一张maven依赖关系图 ###

![04d129caeddf32b6959f4eae6dc399db3ac.jpg][]

转载于:https://my.oschina.net/anlve/blog/3031065

[80_]: https://my.oschina.net/u/2663968/blog/3051541
[hot3.png]: /images/20220117/5e35bdcc11c8480d86ecc05581a835ea.png
[Link 1]: https://start.spring.io/
[a9c86fc4e4edb87d49da45a792797f879ae.jpg]: /images/20220117/7044dd7e689a4d47a6a42b8caeda3ff9.png
[b42f512a6e1fa176462de02e2d46c828763.jpg]: /images/20220117/0e09cf008fad4c0697bbf0828262810f.png
[04d129caeddf32b6959f4eae6dc399db3ac.jpg]: /images/20220117/0c7772623f784bc69f42b1a771b6389e.png