JSTL标签库简介

核心标签库

http://java.sun.com/jsp/jstl/core

<c:catch>,<c:url>的使用

<!-- 捕获异常 -->

     <c:catch var="exception">

         <%

             int a=1,b=0;

             out.print(a/b);

          %>

     </c:catch>

     <c:out value="${exception }"/>

     <!-- 建立URL -->

     <a href="<c:url value="//index.jsp"/>">哈哈哈</a>

     <a href="/index.jsp">哈哈哈</a>

     <!-- 使用其他Web应用URL -->

     <c:url value="/index.jsp" var="add" context="/MyMessage"/>

     <a href="${add }">呵呵</a>

<c:if>,<c:when>,<c:otherwise>,<c:choose>的使用

<%

         Calendar now=Calendar.getInstance();

         Integer hour=new Integer(now.get(Calendar.HOUR_OF_DAY));//获取小时

         request.setAttribute("time", hour);

      %>

      <c:if test="${time>=0&&time<=11 }">

          <c:set value="早上好!" var="sayhello"/>

      </c:if>

      <c:if test="${time>=12&&time<=17 }">

          <c:set value="下午好!" var="sayhello"/>

      </c:if>

      <c:if test="${time>=18&&time<=23 }">

          <c:set value="晚上好!" var="sayhello"/>

      </c:if>

      <c:out value="${sayhello }"/>

      <c:choose>

          <c:when test="${time>=0&&time<=11 }">

              <c:set value="moring" var="sayhello"/>

          </c:when>

          <c:when test="${time>=12&&time<=17 }">

              <c:set value="noon" var="sayhello"/>

          </c:when>

          <c:otherwise>

              <c:set value="night" var="sayhello"/>

          </c:otherwise>

      </c:choose>

      <c:out value="${sayhello }"/>