通过返回WebMvcConfigurationSupport 的方式, 默认会覆盖 Spring boot的自动配置, 导致配置失效静态资源无法访问:但是在WebMvcConfigurationadpter(已久过时)这是允许的 ``` @Bean public WebMvcConfigurationSupport initIndexConfig() { return new WebMvcConfigurationSupport() { @Override protected void addViewControllers(ViewControllerRegistry registry) { registry.addViewController("/").setViewName("login"); registry.addViewController("/index.html").setViewName("login"); } @Override protected void addResourceHandlers(ResourceHandlerRegistry registry) { registry.addResourceHandler("/**") .addResourceLocations("classpath:/resources") .addResourceLocations("classpath:/static") .addResourceLocations("classpath:/templates") .addResourceLocations("classpath:/public"); } @Override protected void addInterceptors(InterceptorRegistry registry) { super.addInterceptors(registry); } }; } ``` WebMvcConfigurerAdapter 是一个适配器类, ``` /** @deprecated */ @Deprecated public abstract class WebMvcConfigurerAdapter implements WebMvcConfigurer { public WebMvcConfigurerAdapter() { } ``` WebMvcConfigurerAdapter 比较常用的重写接口 ``` /** 解决跨域问题 **/ public void addCorsMappings(CorsRegistry registry) ; /** 添加拦截器 **/ void addInterceptors(InterceptorRegistry registry); /** 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); /** 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); ``` WebMvcConfigurationSupport 提供默认实现 不是一个空方法 ``` public class WebMvcConfigurationSupport implements ApplicationContextAware, ServletContextAware { private static final boolean romePresent; private static final boolean jaxb2Present; private static final boolean jackson2Present; private static final boolean jackson2XmlPresent; private static final boolean jackson2SmilePresent; private static final boolean jackson2CborPresent; ``` 所以: 采用返回 @Bean的方式, 会覆盖实现的很多默认配置导致不能使用, 正确的使用方法是: ``` @Configuration public class AppConfig extends WebMvcConfigurationSupport{ @Override protected void addViewControllers(ViewControllerRegistry registry) { registry.addViewController("/").setViewName("login"); registry.addViewController("/index.html").setViewName("login"); } @Override protected void addResourceHandlers(ResourceHandlerRegistry registry) { registry.addResourceHandler("/**") .addResourceLocations("classpath:/resources") .addResourceLocations("classpath:/static") .addResourceLocations("classpath:/templates") .addResourceLocations("classpath:/public"); } @Override protected void addInterceptors(InterceptorRegistry registry) { super.addInterceptors(registry); } ``` 你还可以选择 直接实现 WebMvcConfigurer; 关于支持Webjar Swagger 等Jar包的资源路径 ``` /** * 资源路径 映射 */ @Override protected void addResourceHandlers(ResourceHandlerRegistry registry) { registry.addResourceHandler("/**") .addResourceLocations("classpath:/resources") .addResourceLocations("classpath:/static") .addResourceLocations("classpath:/templates") .addResourceLocations("classpath:/public"); /** * 支持webjars */ registry.addResourceHandler("/webjars/**") .addResourceLocations("classpath:/META-INF/resources/webjars/"); /** * 支持swagger */ registry.addResourceHandler("swagger-ui.html") .addResourceLocations("classpath:/META-INF/resources/"); super.addResourceHandlers(registry); } ``` [原文](https://www.cnblogs.com/dgwblog/p/11962497.html)