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SpringMVC相关自动配置

news 2025/8/26 14:49:41

一.概述

     文本探讨了SpringBoot的自动装配原理对于有关web的自动配置，其主要有四个配置类。 

  •  ServletWebServerFactoryAutoConfiguration

        自动配置和初始化一个内嵌的 Servlet Web 服务器

  •  DispatcherServletAutoConfiguration

        用于自动配置 Spring MVC 核心组件DispatcherServlet

  •  WebMvcAutoConfiguration

        用于自动配置 Spring MVC 基础设施的类，如视图解析器、静态资源处理、类型转换、数据绑定、消息转换器（JSON）、格式化器以及众多默认设置

  •  ErrorMvcAutoConfiguration

       用于自动配置错误处理机制的类

测试代码如下：

package com.example.springdemo.demos.a06;import org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration;
import org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryAutoConfiguration;
import org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration;
import org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration;
import org.springframework.boot.web.servlet.context.AnnotationConfigServletWebApplicationContext;
import org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.DeferredImportSelector;
import org.springframework.context.annotation.Import;
import org.springframework.core.type.AnnotationMetadata;/*** @author zhou* @version 1.0* @description TODO* @date 2025/8/23 22:22*/
public class TestMvcAuto {public static void main(String[] args) {AnnotationConfigServletWebServerApplicationContext context = new AnnotationConfigServletWebServerApplicationContext();context.registerBean(Config.class);context.refresh();for (String name : context.getBeanDefinitionNames()){String source = context.getBeanDefinition(name).getDescription();if(source != null){System.out.println(name+"来源: "+source);}}context.close();}@Configuration@Import(MyImportSelector.class)static class Config{}static class MyImportSelector implements DeferredImportSelector{@Overridepublic String[] selectImports(AnnotationMetadata importingClassMetadata) {return new String[]{ServletWebServerFactoryAutoConfiguration.class.getName(),DispatcherServletAutoConfiguration.class.getName(),WebMvcAutoConfiguration.class.getName(),ErrorMvcAutoConfiguration.class.getName()};}}
}

测试结果：

tomcatServletWebServerFactory来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/ServletWebServerFactoryConfiguration$EmbeddedTomcat.class]
servletWebServerFactoryCustomizer来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/ServletWebServerFactoryAutoConfiguration.class]
tomcatServletWebServerFactoryCustomizer来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/ServletWebServerFactoryAutoConfiguration.class]
dispatcherServlet来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/DispatcherServletAutoConfiguration$DispatcherServletConfiguration.class]
dispatcherServletRegistration来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/DispatcherServletAutoConfiguration$DispatcherServletRegistrationConfiguration.class]
requestMappingHandlerAdapter来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
requestMappingHandlerMapping来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
welcomePageHandlerMapping来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
localeResolver来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
themeResolver来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
flashMapManager来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
mvcConversionService来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
mvcValidator来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
mvcContentNegotiationManager来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
mvcPatternParser来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
mvcUrlPathHelper来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
mvcPathMatcher来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
viewControllerHandlerMapping来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
beanNameHandlerMapping来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
routerFunctionMapping来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
resourceHandlerMapping来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
mvcResourceUrlProvider来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
defaultServletHandlerMapping来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
handlerFunctionAdapter来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
mvcUriComponentsContributor来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
httpRequestHandlerAdapter来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
simpleControllerHandlerAdapter来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
handlerExceptionResolver来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
mvcViewResolver来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
mvcHandlerMappingIntrospector来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
viewNameTranslator来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]
defaultViewResolver来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.class]
viewResolver来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.class]
requestContextFilter来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.class]
formContentFilter来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration.class]
error来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/error/ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration.class]
beanNameViewResolver来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/error/ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration.class]
conventionErrorViewResolver来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/error/ErrorMvcAutoConfiguration$DefaultErrorViewResolverConfiguration.class]
errorAttributes来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/error/ErrorMvcAutoConfiguration.class]
basicErrorController来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/error/ErrorMvcAutoConfiguration.class]
errorPageCustomizer来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/error/ErrorMvcAutoConfiguration.class]
preserveErrorControllerTargetClassPostProcessor来源: class path resource [org/springframework/boot/autoconfigure/web/servlet/error/ErrorMvcAutoConfiguration.class]

          可以看到，配置类里面导入了许多有关处理web请求的类，例如：适配器，影射器等等。

二.配置类分析

1.EmbeddedTomcat类的导入

         从上面可以看到SpringBoot是怎么导入内嵌Tomcat类的，只有当项目中存在Servlet, Tomcat, UpgradeProtocol类的时候才会导入。

2.DispatcherServletConfiguration类

        用于导入DispatcherServlet相关的配置，该类存在的前提是ServletRegistration类存在

并且自动导入WebMvcProperties配置

       该类是有关web的相关配置类，项目的主配置文件中以spring.mvc为前缀的属性值会和该类做绑定。

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