To automatically serve static resources with Spring Boot (e.g. when using spring-boot-starter-web), you can
 simply place the static resources in one of several paths that Spring Boot automatically recognizes as a
 static file paths.
 Following are paths that will are recognized as static file paths:
 <ul>
 <li><code>src/main/resources/META-INF/resources/index.html</code></li>
 <li><code>src/main/resources/resources/index.html</code></li>
 <li><code>src/main/resources/static/index.html</code></li>
 <li><code>src/main/resources/public/index.html</code></li>
 </ul>
 You can then access the resources at:
 <code>http://host/index.html</code>
 So, for example, given the following resource at the following location…
 <ul>
 <li><code>src/main/resources/static/css/bootstrap.min.css</code></li>
 </ul>
 You could fetch the file with the following URL:
 <code>http://host/css/bootstrap.min.css</code>

Learn how to serve static resources with Spring Boot.

Serve Static Resources With Spring Boot