java中session存放对象，jsp页面获取session的对象值

java中sesson放值

	        HttpServletRequest request=null;
            HttpSession session = request.getSession();
            session.setAttribute("caseMainBack", caseMain);

jsp页面获取session的对象值

 <c:if test="${ sessionScope.caseMainBack!=null }">
      <input type="text" id="contactAddress" name="contactAddress" value="${ sessionScope.caseMainBack.contactAddress}"/>
  </c:if>

java代码session取值

   HttpServletRequest request=null;
   HttpSession session = request.getSession();
   String caseMainBack= (String) session.getAttribute("caseMainBack");