JSTL

Должны быть библиотеки jstl.jar и standart.jar лежат где-то тут C:\apache-tomcat-6.0.16\webapps\examples\WEB-INF\lib
//Декларация
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

//Вывод
<c:out value="${user.login}'s blog" default="guest"/>

//Цикл
<c:forEach var="message" items="${messagesList}">
        <b>${message.title}</b>
        ${mine:parseDate(message.date)}<Br>
        ${message.content}<Br><Br>
</c:forEach>

//if
<c:if test=”${userType eq ‘member’ }” >
    <jsp:include page=”inputComments.jsp”/>
</c:if>

//When-otherwise
<c:choose>
    <c:when test=”${userPref == ‘performance’}”>
        Now you can stop even if you <em>do</em> drive insanely fast.
    </c:when>
    <c:when test=”${userPref == ‘safety’}”>
        Our brakes will never lock up, no matter how bad a driver you are.
    </c:when>
    <c:when test=”${userPref == ‘maintenance’}”>
        Lost your tech job? No problem--you won’t have to service these brakes
        for at least three years.
    </c:when>
    <c:otherwise>
        Our brakes are the best.
    </c:otherwise>
</c:choose>

//Set
<c:set var=”userLevel” scope=”session” value=”Cowboy” /> - значение переменной
<c:set target=”${PetMap}” property=”dogName” value=”Clover” /> - JavaBean или Map

//Удаялем переменную
<c:remove var=”userStatus” scope=”request” />

//Импорт и передача параметра
<c:import url=”Header.jsp” >
    <c:param name=”subTitle” value=”We take the sting out of SOAP.” />
</c:import>