首先是四大标签库核心 标签库<%@ taglib uri="http://java.sun.com/jsp/jstl/core"%>格式标签库<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt"%>SQL标签库<%@ taglib uri="http://java.sun.com/jsp/jstl/sql"%>函数标签库<%@ taglib uri="http://java.sun.com/jsp/jstl/functions"%>