关于jsp的问题

Question

<c:if test="${not empty requestScope.opr}"> action="<%=request.getContextPath()%>/TopicServlet"这两段代码啥意思啊

Answer 1

<c:if test="${not empty requestScope.opr}">这表示requestScope.opr判断不为null

action="<%=request.getContextPath()%>/TopicServlet"//<%=request.getContextPath()%>这个是求绝对路径=“绝对路径/TopicServlet”