精通SpringBoot——第二篇：视图解析器，静态资源和区域配置-白红宇

今天让我们来看看另一个重要的类：WebMvcAutoConfigurationAdapter。先来看看它的声明：

@Configuration@Import(EnableWebMvcConfiguration.class)@EnableConfigurationProperties({ WebMvcProperties.class, ResourceProperties.class })@Order(0)public static class WebMvcAutoConfigurationAdapter implements WebMvcConfigurer, ResourceLoaderAware {

很显然，它也是SpringBoot的一个配置类，@Improt注解是被用来整合所有在@Configuration注解中定义的bean配置。这其实很像我们将多个XML配置文件导入到单个文件的情形。@Import注解实现了相同的功能。

再往下看可以看到SpringBoot中常见的viewResolver

@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;        }

接着往下看，可以看到这个是配置区域的。@ConditionalOnProperty表示如果在application.properties中配置了spring.mvc.locale属性，则该配置会生效。

@Bean        @ConditionalOnMissingBean        @ConditionalOnProperty(prefix = "spring.mvc", name = "locale")        public LocaleResolver localeResolver() {            if (this.mvcProperties                    .getLocaleResolver() == WebMvcProperties.LocaleResolver.FIXED) {                return new FixedLocaleResolver(this.mvcProperties.getLocale());            }            AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver();            localeResolver.setDefaultLocale(this.mvcProperties.getLocale());            return localeResolver;        }

再往下看是配置静态资源（包括/webjars/**，classpath:/META-INF/resources/webjars/"）和favicon（可以通过在application.properties中设置spring.mvc.favicon.enabled来启用或禁用）

好了，文章到这里就结束了，静态资源这一块并没有什么特别的地方。我们需要理解的是这几个注解的用法，还有使用了配置属性，可以允许用户对其进行自定义。还有一个值得提一下，默认的地域解析器只会处理一个地域，通过上面提到的spring.mvc.locale来配置。