forEach tag in JSTL

forEach use

<%
	String [] arr = {"yy" ,"qq" ,"ee"};
	//Must be set to the domain first, the following EL expression can get this object
	pageContext.setAttribute("arr", arr);
%>
<!-- forEach loop-->

<c:forEach items="${arr }" var="str">
	<c:out value="${str }"></c:out>
</c:forEach>

<c:out value="${123 }"></c:out>

<c:forEach begin="1" end="10" var="ss">
	<c:out value="${ss }"></c:out>
</c:forEach>

Can traverse collections, list maps, etc.

Another property of JSTL:

The forEach tag also has an attribute: varStatus, which is used to specify the variable name that receives the "loop status", for example: <forEach varStatus="vs" .../>, then you can use the vs variable to get the status of the loop .
current item (of the collection) for the current iteration
index the iteration index of the current iteration starting at 0
count The iteration count for the current iteration starting at 1
first is used to indicate whether the current iteration is the first iteration
last is the flag used to indicate whether the current iteration is the last iteration
<c:forEach var="item" items="${ns }" varStatus="vs">
	<c:if test="${vs.first }">第一行：</c:if>
	<c:if test="${vs.last }">最后一行：</c:if>
	<c:out value="第${vs.count }行: "/>
	<c:out value="[${vs.index }]: "/>
	<c:out value="name: ${vs.current }"/><br/>
</c:forEach>