springboot中默认给的静态资源路径有以下四个，访问的优先顺序从上到下：

• src/main/resources/META-INF/resources
• src/main/resources/resources
• src/main/resources/static
• src/main/resources/public
  如果需要自定义文件夹访问静态资源需要通过如下方式配置：

@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {

    @Override
    protected void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/custom/**").addResourceLocations("classpath:/customStatic/");
    }
}

• addResourceHandler参数为浏览器访问时输入的url路径名
• addResourceLocations参数为项目文件夹实际路径
  即访问localhost:8080/costom/custom.html，spring将会去customStatic文件夹下去寻找