WebMvcConfigurer配置类其实是Spring内部的一种配置方式，采用JavaBean的形式来代替传统的xml配置文件形式进行针对框架个性化定制。基于java-based方式的spring mvc配置，需要创建一个配置类并实现WebMvcConfigurer 接口，WebMvcConfigurerAdapter 抽象类是对WebMvcConfigurer接口的简单抽象（增加了一些默认实现），但在在SpringBoot2.0及Spring5.0中WebMvcConfigurerAdapter已被废弃 。官方推荐直接实现WebMvcConfigurer或者直接继承WebMvcConfigurationSupport，方式一实现WebMvcConfigurer接口（推荐），方式二继承WebMvcConfigurationSupport类，具体实现可看这篇文章。https://www.jb51.net/article/174766.htm

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//
 
package org.springframework.web.servlet.config.annotation;
 
import java.util.List;
import org.springframework.format.FormatterRegistry;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.validation.MessageCodesResolver;
import org.springframework.validation.Validator;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.HandlerMethodReturnValueHandler;
import org.springframework.web.servlet.HandlerExceptionResolver;
 
public interface WebMvcConfigurer {
 void configurePathMatch(PathMatchConfigurer var1);
 
 void configureContentNegotiation(ContentNegotiationConfigurer var1);
 
 void configureAsyncSupport(AsyncSupportConfigurer var1);
 
 void configureDefaultServletHandling(DefaultServletHandlerConfigurer var1);
 
 void addFormatters(FormatterRegistry var1);
 
 void addInterceptors(InterceptorRegistry var1);
 
 void addResourceHandlers(ResourceHandlerRegistry var1);
 
 void addCorsMappings(CorsRegistry var1);
 
 void addViewControllers(ViewControllerRegistry var1);
 
 void configureViewResolvers(ViewResolverRegistry var1);
 
 void addArgumentResolvers(List<HandlerMethodArgumentResolver> var1);
 
 void addReturnValueHandlers(List<HandlerMethodReturnValueHandler> var1);
 
 void configureMessageConverters(List<HttpMessageConverter<?>> var1);
 
 void extendMessageConverters(List<HttpMessageConverter<?>> var1);
 
 void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> var1);
 
 void extendHandlerExceptionResolvers(List<HandlerExceptionResolver> var1);
 
 Validator getValidator();
 
 MessageCodesResolver getMessageCodesResolver();
}

接下来我们着重找几个方法讲解一下：

 /* 拦截器配置 */
void addInterceptors(InterceptorRegistry var1);
/* 视图跳转控制器 */
void addViewControllers(ViewControllerRegistry registry);
/**
  *静态资源处理
**/
void addResourceHandlers(ResourceHandlerRegistry registry);
/* 默认静态资源处理器 */
void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer);
/**
  * 这里配置视图解析器
 **/
void configureViewResolvers(ViewResolverRegistry registry);
/* 配置内容裁决的一些选项*/
void configureContentNegotiation(ContentNegotiationConfigurer configurer);