springboot的springMVC配置，源码

1，前端控制器自动管理

 DispatcherServletAutoConfiguration 中

此方法创建了前端控制器

注册了前端控制器

 其中标黄色一行最后的  .getPath()方法点进去

 String path = "/" 默认，所以这就是后缀不用加.do或者其他后缀的原因

2，控制器的自动管理

自动扫描，目录为启动类的包，或者子包

或者使用@ComponentScan去处理，自定义扫描路径

3，视图解析器的自动管理

@Bean
@ConditionalOnMissingBean
public InternalResourceViewResolver defaultViewResolver() {
   InternalResourceViewResolver resolver = new InternalResourceViewResolver();
   resolver.setPrefix(this.mvcProperties.getView().getPrefix());
   resolver.setSuffix(this.mvcProperties.getView().getSuffix());
   return resolver;
}

@Bean
@ConditionalOnBean(View.class)
@ConditionalOnMissingBean
public BeanNameViewResolver beanNameViewResolver() {
   BeanNameViewResolver resolver = new BeanNameViewResolver();
   resolver.setOrder(Ordered.LOWEST_PRECEDENCE - 10);
   return resolver;
}

@Bean
@ConditionalOnBean(ViewResolver.class)
@ConditionalOnMissingBean(name = "viewResolver", value = ContentNegotiatingViewResolver.class)
public ContentNegotiatingViewResolver viewResolver(BeanFactory beanFactory) {
   ContentNegotiatingViewResolver resolver = new ContentNegotiatingViewResolver();
   resolver.setContentNegotiationManager(beanFactory.getBean(ContentNegotiationManager.class));
   // ContentNegotiatingViewResolver uses all the other view resolvers to locate
   // a view so it should have a high precedence
   resolver.setOrder(Ordered.HIGHEST_PRECEDENCE);
   return resolver;
}

文件上传下载的视图解析器

MultipartAutoConfiguration 类