Web context objects: #httpServletRequest & #httpSession in Thymeleaf

Recently while working on a web application developed using Spring Boot & Thymeleaf, I came to know that Thymeleaf provides direct access to #httpServletRequest & #httpSession objects inside a web environment. These objects are also known as Web context objects. Today we would be discussing these objects and their usages with examples.

• #httpServletRequest: It provides direct access to the javax.servlet.http.HttpServletRequest object associated with the current request.
  

  ## Usages
  ${#httpServletRequest.getParameter('foo')}
  ${#httpServletRequest.getAttribute('foo')}
  ${#httpServletRequest.getContextPath()}
  ${#httpServletRequest.getRequestName()}
  
  ## use case while using Script Inlining Feature of Thymeleaf
  <script th:inline="javascript" type="text/javascript">
  /*<![CDATA[*/
      ...
      var assignmentId = /*[[${#httpServletRequest.getParameter('assignmentid')}]]*/ 0;
  
  /*]]>*/
  </script>
  
  ## another example 
  <a th:if="${#httpServletRequest.getParameter('assignmentid') != null} and ${#httpServletRequest.requestURI eq '/studentassignment'}" 
     th:href="@{${#httpServletRequest.requestURI}(isbn=${bookModel.isbn},assignmentid=${#httpServletRequest.getParameter('assignmentid')})}"   
     th:text="${'Test Link'}">Test Link</a>
  

• #httpSession: It provides direct access to the javax.servlet.http.HttpSession object associated with the current request.
  

  ## Usages
  ${#httpSession.getAttribute('foo')}
  ${#httpSession.id}
  ${#httpSession.lastAccessedTime}

Hoping that it might be useful for you guys. Happy Learning!! ☺