In this example we:

capture form values in the controller, and
learn to use the thymeleaf th:action attribute

Start with this:

-bash-4.2$ pwd
/u/dgerman/apache/htdocs/spring-boot/fall2019/step04
-bash-4.2$ tree
.
+-- pom.xml
+-- src
    +-- main
        +-- java
        |   +-- com
        |       +-- example
        |           +-- demo
        |               +-- HomeController.java
        |               +-- SpringBoot04Application.java
        +-- resources
            +-- templates
                +-- confirm.html
                +-- formtemplate.html

8 directories, 8 files
-bash-4.2$

Build and run like before, then http://silo.cs.indiana.edu:31415/loadform.