WebMvcConfigurer配置类是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，可以自定义一些Handler，Interceptor，ViewResolver，MessageConverter。

public interface WebMvcConfigurer {void configurePathMatch(PathMatchConfigurer var1);void configureContentNegotiation(ContentNegotiationConfigurer var1);void configureAsyncSupport(AsyncSupportConfigurer var1);/* 默认静态资源处理器 */void configureDefaultServletHandling(DefaultServletHandlerConfigurer var1);void addFormatters(FormatterRegistry var1);/* 拦截器配置 */void addInterceptors(InterceptorRegistry var1);/* 静态资源处理 */void addResourceHandlers(ResourceHandlerRegistry var1);/* 解决跨域问题 */void addCorsMappings(CorsRegistry var1);/* 视图跳转控制器 */void addViewControllers(ViewControllerRegistry var1);/* 这里配置视图解析器 */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();
}

1. addInterceptors：拦截器

• addPathPatterns：用于设置拦截器的过滤路径规则；addPathPatterns("/**")对所有请求都拦截
• excludePathPatterns：用于设置不需要拦截的过滤规则
• 拦截器主要用途：进行用户登录状态的拦截，日志的拦截等。

    @Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(userAuthorizationInterceptor).addPathPatterns("/admin/**").excludePathPatterns("/admin/zhz/**");}

2. addViewControllers：页面跳转

在使用SpringMVC的时候，如果需要访问一个页面，必须要写Controller类，然后再写一个方法跳转到页面，在这里重写WebMvcConfigurer中的addViewControllers方法可达到同样的效果

@Overridepublic void addViewControllers(ViewControllerRegistry registry) {registry.addViewController("/admin").setViewName("forward:/admin/u/toLogin");   /* 注册默认首页路径*/registry.addViewController("/").setViewName("forward:/index");registry.setOrder(Ordered.HIGHEST_PRECEDENCE);super.addViewControllers(registry);}

 3. addResourceHandlers：静态资源

用来自定义静态资源映射目录

@Configuration
public class MyWebMvcConfigurerAdapter implements WebMvcConfigurer {/* 配置静态访问资源 */@Overridepublic void addResourceHandlers(ResourceHandlerRegistry registry) {registry.addResourceHandler("/picture/**")  //表示文件路径，这里的意思是picture包下的所有文件，所有/picture/开头的请求 //都会去后面配置的路径下查找资源.addResourceLocations("file:D:/picture/"); //表示要开放的资源}
}

4.configureViewResolvers：视图解析器

/*** 配置请求视图映射* @return*/
@Bean
public InternalResourceViewResolver resourceViewResolver()
{InternalResourceViewResolver internalResourceViewResolver = new InternalResourceViewResolver();//请求视图文件的前缀地址internalResourceViewResolver.setPrefix("/WEB-INF/jsp/");//请求视图文件的后缀internalResourceViewResolver.setSuffix(".jsp");return internalResourceViewResolver;
}/*** 视图配置* @param registry*/
@Override
public void configureViewResolvers(ViewResolverRegistry registry) {super.configureViewResolvers(registry);registry.viewResolver(resourceViewResolver());/*registry.jsp("/WEB-INF/jsp/",".jsp");*/
}