String fn:trim(String sourceStr)其中，sourceStr 为指定字符串。
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%>
<!DOCTYPE html>
<html>
<head>
<title>编程帮(www.lmcjl.com)</title>
</head>
<body>
<c:set var="msg" value=" Welcome to bianchengbang " />
${fn:trim(msg)}
</body>
</html>
Welcome to bianchengbang
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