WebMvcConfigurationSupport 避坑指南

 

　　通過返回WebMvcConfigurationSupport 的方式, 默認會覆蓋 Spring boot的自動配置, 導致配置失效靜態資源無法訪問:但是在WebMvcConfigurationadpter(已久過時)這是允許的

@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 是一個適配器類,

/** @deprecated */
@Deprecated
public abstract class WebMvcConfigurerAdapter implements WebMvcConfigurer {
    public WebMvcConfigurerAdapter() {
    }

 而WebMvcConfigurationSupport  提供默認實現 不是一個空方法

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, 會覆蓋實現的很多默認配置導致不能使用,

正確的使用方法是:

@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);
           }

你還可以選擇 直接實現 

WebMvcConfigurer;

關於支持Webjar Swagger 等Jar包的資源路徑

   /**
     * 資源路徑 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);
    }