JSTL Core标签的使用

首先通过taglib指定标签的url

<%@ taglib url='http://java.....' prefix=c %>

一般用途标签：
out标签

<c:set value="chen" var="cc" scope="page" />
<c:out value="${pageScope.cc}">ddddd</c:out>
或
<c:out value="${pageScope.cc}" default="ddddd"></c:out>

set标签

<c:set value="chen" var="cc" scope="page" />
对对象进行set赋值
<c:set target=${user} property="age" value="18" />

remove标签

<c:remove var="varName" scope=[page|request|session|application] />

catch标签

<c:catch var="exception">
<%int ii=10/0;%>
</c:catch>
<c:out value="${exception}"></c:out>
<c:out value="${exception.message}"></c:out>

条件标签：
if标签

<c:if test="${pageScope.cc == 'chen'}">条件正确就输出我</c:if>
或
<c:if test="${1==1}" var="if" scope="page"></c:if>
<c:out value="${pageScope.if}"></c:out>

choose，when,otherwise标签

<c:choose>
<c:when test="${1==2}">I am one</c:when>
<c:when test="${pageScope.cc == 'chen1'}">I am two</c:when>
<c:otherwise>It's not eq</c:otherwise>
</c:choose>

迭代标签：
forEach标签

<%
HashMap hm = new HashMap();
hm.put("1","one);
hm.put("2","two");
hm.put("3","three");
ArrayList list = new ArrayList();
list.add("a");
list.add("b");
%>
<c:forEach var="tmp" items="<%=hm %>">
${tmp.key} &nbsp; &nbsp;${tmp.value}
<br>
</c:forEach>
<c:forEach var="tmp" items="<%=list %>" varStatus="status"> 
${status.count} 
</c:forEach>

forTokens标签

<% String str="123,456,abc,ddd"; %>
<c:forTokens items="<%=str %>" delims="," var="item">
${item}
</c:forTokens>