OCEJWCD.- 8.Developing JSP pages using custom tags (part1)

OCEJWCD (SCWCD) - 1Z0-899 - Web Component Developer Certification
8.1.Relate the JSTL to common job roles in web application development and understand the use of tags in JSP developments.

The Java Standard Tag Library is a collection of standard custom tags
JSTL have a set of libraries:
- Core library
- Formatting library
- XML library
- SQL library

8.2.Recognize correct syntax for tags.

• To escape XML or set to default and attribute

<c:out value="${message} escapeXml="true"/>

<c:out value="${user} default ="usuario1" />

• Looping

<c:forEach var="item" items="${itemList}">

  ${item}

</c:out>

• Conditions

<c:if test=${number eq 5}>

  Condition 1 displayed

</c:if>

• Nested conditions

<c:choose>

  <c:when test....

  </c:when>

  <c:otherwise>

  </c:otherwise>

</c:choose>

• set variable in a scope or a bean/map attribute:

<c:set var="name" scope="session" value="user1"/> 

*by default page scope

<c:set target="${beanPerson}" property="name" value="user1"/>

*if the bean is null throws an exception

• include content dynamically that can be external to the container

<c:import url="....>

• url rewriting and encoding

<c:url value="input.jsp" var="inputURL">

  <c:param name="name" value="${name}"/>

</c:url>

8.3.Configure a JSP to use tags from the JSTL.

At application level the files: jstl.jar and standard.jar should be in WEB-INF/lib directory.

In the JSP the following declaration should exist to use JSTL: taglib directive

<%@taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %>

See an example in post ocejwcd-6-more-view-facilities in section  6.5

OCEJWCD (SCWCD) - 1Z0-899 - Web Component Developer Certification