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CS320 Web and Internet Programming JSP Standard Tag Library (JSTL)

CS320 Web and Internet Programming JSP Standard Tag Library (JSTL). Chengyu Sun California State University, Los Angeles. Simple JSTL Example. <%@ page contentType="text/html" %> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <html><head><title>JSTL Hello</title></head>

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CS320 Web and Internet Programming JSP Standard Tag Library (JSTL)

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  1. CS320 Web and Internet ProgrammingJSP Standard Tag Library (JSTL) Chengyu Sun California State University, Los Angeles

  2. Simple JSTL Example <%@ page contentType="text/html" %> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <html><head><title>JSTL Hello</title></head> <body> <c:out value="Hello World in JSTL." /> </body> </html>

  3. taglib Directive • URI • A unique identifier for the tag library • NOT a real URL • Prefix • A short name for the tag library • Could be an arbitrary name

  4. JSP Standard Tag Library (JSTL) http://java.sun.com/products/jsp/jstl/1.1/docs/tlddocs/index.html

  5. Flow control <c:if> <c:choose> <c:when> <c:otherwise> <c:forEach> <c:forToken> Variable support <c:set> <c:remove> URL <c:param> <c:redirect> <c:import> <c:url> Output <c:out> Exception handling <c:catch> JSTL Core

  6. JSTL Usage Examples • ShoppingCart.jsp • Login.jsp and Members.jsp

  7. Branch Tags <c:if test=“${!cart.notEmpty}”> The cart is empty.</c:if> <c:choose> <c:when test=“${!cart.notEmpty}”> The cart is emtpy. </c:when> <c:otherwise> <%-- do something --%> </c:otherwise> </c:choose>

  8. Loop Tags <%-- iterator style --%> <c:forEach items=“${cart.items}” var=“i”> ${i} <br> </c:forEach> <%-- for loop style --%> <c:forEach begin=“0” end=“${cart.size}” step=“1” var=“i”> ${cart.items[i]} </c:forEach> <forToken ....> Exercise

  9. Set and Remove Scope Variables In Login.jsp <c:set var=“authorized” value=“true” scope=“session”/> In CheckLogin.jsp <c:if test=“${empty sessionScope.authorized}”> <c:redirect url=“Login.jsp” /> </c:if> In Logout.jsp <c:remove var=“authorized” scope=“session” />

  10. Set Bean Property • <jsp:setProperty> • name attribute must be a bean declared by <jsp:useBean> • <c:set> • target attribute can be any object with a setter • Example: <c:set target=“${bb.a}” property=“a” value=“${param.a}” />

  11. URL Tags <c:import url=“/books.xml” var=“something” /> <x:parse doc=“${something}” var=“booklist” scope=“application” /> <c:url var="url" value="/catalog" > <c:param name="Add" value="${bookId}" /> </c:url> <a href="${url}">Get book</a>

  12. Output • You want to use <c:out> if • escapeXML=true • value is a Java.io.Reader object <c:out value=“100” /> <c:out value=“${price}” /> ${100} ${price}

  13. Character Conversion • When escapeXML=true

  14. Exception Handling • <c:catch> • see Error Page and Exception Handing

  15. fn:length() fn:contains() fn:containsIgnoreCase() fn:startWith() fn:endsWith() fn:indexOf() fn:replace() fn:trim() fn:toUpperCase() fn:toLowerCase() fn:substring() fn:substringAfter() fn:substringBefore() fn:split() fn:join() fn:escapeXML() JSTL Functions

  16. Function Example • Exercise

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