C标签的用法（选择）

<c:choose>
	<c:when test="${supply.msgtype ==1}">供应</c:when>
	<c:when test="${supply.msgtype ==2}">求购</c:when>										
	<c:otherwise>未知</c:otherwise>				
</c:choose>


<c:if test="${supply.msgtype==1}></c:if>