spring.mvc.hiddenmethod.filter.enabled=true
<input type="hidden" name="_method" value="PUT">
예제
<form role="form" method="post" enctype="multipart/form-data" th:action="@{/boards/{id}(id=${boardFormDto.id})}" th:object="${boardFormDto}">
<input type="hidden" name="_method" value="PUT">
글 잘 봤습니다.