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class Bean{
private String name;
private ArrayList<String> list;
private HashMap<String,String> map;
}
request.setAttribute("bean",Bean);
<c:if test="${not empty bean.map}">
<c:forEach var="obj" items="${bean.map}">
<p>${obj.key}</p>
</c:forEach>
</c:if>
request.setAttribute("list",list);
jsp引用jstl库
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<c:if test="${not empty list}">
<c:forEach var="obj" items="${list}">
<p>${obj}</p>
</c:forEach>
</c:if>