Spring MVC Auto-configuration // Spring Boot为Spring MVC提供了自动配置,它可以很好地与大多数应用程序一起工作。 Spring Boot provides auto-configuration for Spring MVC that works well with most applications. // 自动配置在Spring默认设置的基础上添加了以下功能: The auto-configuration adds the following features on top of Spring’s defaults: // 包含视图解析器 Inclusion of ContentNegotiatingViewResolver and BeanNameViewResolver beans. // 支持静态资源文件夹的路径,以及webjars Support for serving static resources, including support for WebJars // 自动注册了Converter: // 转换器,这就是我们网页提交数据到后台自动封装成为对象的东西,比如把"1"字符串自动转换为int类型 // Formatter:【格式化器,比如页面给我们了一个2019-8-10,它会给我们自动格式化为Date对象】 Automatic registration of Converter, GenericConverter, and Formatter beans. // HttpMessageConverters // SpringMVC用来转换Http请求和响应的的,比如我们要把一个User对象转换为JSON字符串,可以去看官网文档解释; Support for HttpMessageConverters (covered later in this document). // 定义错误代码生成规则的 Automatic registration of MessageCodesResolver (covered later in this document). // 首页定制 Static index.html support. // 图标定制 Custom Favicon support (covered later in this document). // 初始化数据绑定器:帮我们把请求数据绑定到JavaBean中! Automatic use of a ConfigurableWebBindingInitializer bean (covered later in this document).
/* 如果您希望保留Spring Boot MVC功能,并且希望添加其他MVC配置(拦截器、格式化程序、视图控制器和其他功能),则可以添加自己 的@configuration类,类型为webmvcconfiguer,但不添加@EnableWebMvc。如果希望提供 RequestMappingHandlerMapping、RequestMappingHandlerAdapter或ExceptionHandlerExceptionResolver的自定义 实例,则可以声明WebMVCregistrationAdapter实例来提供此类组件。 */ If you want to keep Spring Boot MVC features and you want to add additional MVC configuration (interceptors, formatters, view controllers, and other features), you can add your own @Configuration class of type WebMvcConfigurer but without @EnableWebMvc. If you wish to provide custom instances of RequestMappingHandlerMapping, RequestMappingHandlerAdapter, or ExceptionHandlerExceptionResolver, you can declare a WebMvcRegistrationsAdapter instance to provide such components.
// 如果您想完全控制Spring MVC,可以添加自己的@Configuration,并用@EnableWebMvc进行注释。 If you want to take complete control of Spring MVC, you can add your own @Configuration annotated with @EnableWebMvc.
If you want to keep Spring Boot MVC features and you want to add additional MVC configuration (interceptors, formatters, view controllers, and other features), you can add your own @Configuration class of type WebMvcConfigurer but without @EnableWebMvc. If you wish to provide custom instances of RequestMappingHandlerMapping, RequestMappingHandlerAdapter, or ExceptionHandlerExceptionResolver, you can declare a WebMvcRegistrationsAdapter instance to provide such components.
public class DelegatingWebMvcConfiguration extends WebMvcConfigurationSupport { private final WebMvcConfigurerComposite configurers = new WebMvcConfigurerComposite(); // 从容器中获取所有的webmvcConfigurer @Autowired(required = false) public void setConfigurers(List<WebMvcConfigurer> configurers) { if (!CollectionUtils.isEmpty(configurers)) { this.configurers.addWebMvcConfigurers(configurers); } } }