The Java EE 5 Tutorial

Simple Attribute Example

The Duke’s Bookstore shipDate tag, defined in tut-install/javaeetutorial5/examples/web/bookstore3/web/WEB-INF/tags/shipDate.tag, is a custom tag that has a simple attribute. The tag generates the date of a book order according to the type of shipping requested.

<%@ taglib prefix="sc" tagdir="/WEB-INF/tags" %>
<h3><fmt:message key="ThankYou"/> ${param.cardname}.</h3><br>
<fmt:message key="With"/>
 <em><fmt:message key="${param.shipping}"/></em>,
  <fmt:message key="ShipDateLC"/>
<sc:shipDate shipping="${param.shipping}" />

The tag determines the number of days until shipment from the shipping attribute passed to it by the page tut-install/javaeetutorial5/examples/web/bookstore3/web/bookreceipt.jsp. From the number of days, the tag computes the ship date. It then formats the ship date.

<%@ attribute name="shipping" required="true" %>

<jsp:useBean id="now" class="java.util.Date" />
<jsp:useBean id="shipDate" class="java.util.Date" />
  <c:when test="${shipping == ’QuickShip’}">
    <c:set var="days" value="2" />
  <c:when test="${shipping == ’NormalShip’}">
    <c:set var="days" value="5" />
  <c:when test="${shipping == ’SaverShip’}">
     <c:set var="days" value="7" />
<jsp:setProperty name="shipDate" property="time"
    value="${now.time + 86400000 * days}" />
<fmt:formatDate value="${shipDate}" type="date"