< s:iterator var ="childPri" value ="${
priTree.childPris }">
priTree.childPris }">
会提示警告: "value" does not support runtime expressions
改成这样就好了:
< s:iterator var ="childPri" value ="%{#
priTree.childPris }">
priTree.childPris }">
jsp中引入下面标签可使用fn:trim()等函数
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>