springboot不通过controller直接访问静态htm

默认配置下，通过springboot搭建的web服务的资源中，可直接访问只有"classpath:/META-INF/resources/", "classpath:/resources/", "classpath:/static/", "classpath:/public/"这几个目录下的，源码在类ResourceProperties中，如下：

    public class ResourceProperties {
    private static final String[] CLASSPATH_RESOURCE_LOCATIONS = new String[]{"classpath:/META-INF/resources/", "classpath:/resources/", "classpath:/static/", "classpath:/public/"};
    private String[] staticLocations;
    private boolean addMappings;
    private final ResourceProperties.Chain chain;
    private final ResourceProperties.Cache cache;

    public ResourceProperties() {
        this.staticLocations = CLASSPATH_RESOURCE_LOCATIONS;
        this.addMappings = true;
        this.chain = new ResourceProperties.Chain();
        this.cache = new ResourceProperties.Cache();
    }
    ...
}

也可以在application.properties/.yml中配置spring.resources.static-locations来覆盖默认配置，例如(application.yml)：

    spring:
      resources:
        static-locations: classpath:/static/, classpath:/templates/

以下是配置静态资源目录的源码：

    public void setStaticLocations(String[] staticLocations) {
        this.staticLocations = this.appendSlashIfNecessary(staticLocations);
    }

    private String[] appendSlashIfNecessary(String[] staticLocations) {
        String[] normalized = new String[staticLocations.length];

        for(int i = 0; i < staticLocations.length; ++i) {
            String location = staticLocations[i];
            normalized[i] = location.endsWith("/") ? location : location + "/";
        }

        return normalized;
    }

参考文章:
spring boot怎么直接访问html?