<%@tablib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
${fn:substring("你要截取的字符串"),beginIndex,endIndex}

fn:contains 判斷字符串是否包含另外一個(gè)字符串 <c:if test="${fn:contains(name, searchString)}"> 
fn:containsIgnoreCase 判斷字符串是否包含另外一個(gè)字符串(大小寫(xiě)無(wú)關(guān)) <c:if test="${fn:containsIgnoreCase(name, searchString)}"> 
fn:endsWith 判斷字符串是否以另外字符串結(jié)束 <c:if test="${fn:endsWith(filename, ".txt")}"> 
fn:escapeXml 把一些字符轉(zhuǎn)成XML表示，例如<字符應(yīng)該轉(zhuǎn)為< ${fn:escapeXml(param:info)} 
fn:indexOf 子字符串在母字符串中出現(xiàn)的位置 ${fn:indexOf(name, "-")} 
fn:join 將數(shù)組中的數(shù)據(jù)聯(lián)合成一個(gè)新字符串，并使用指定字符格開(kāi) ${fn:join(array, ";")} 
fn:length 獲取字符串的長(zhǎng)度，或者數(shù)組的大小 ${fn:length(shoppingCart.products)} 
fn:replace 替換字符串中指定的字符 ${fn:replace(text, "-", "•")} 
fn:split 把字符串按照指定字符切分 ${fn:split(customerNames, ";")} 
fn:startsWith 判斷字符串是否以某個(gè)子串開(kāi)始 <c:if test="${fn:startsWith(product.id, "100-")}"> 
fn:substring 獲取子串 ${fn:substring(zip, 6, -1)} 
fn:substringAfter 獲取從某個(gè)字符所在位置開(kāi)始的子串
 ${fn:substringAfter(zip, "-")} 
fn:substringBefore 獲取從開(kāi)始到某個(gè)字符所在位置的子串 ${fn:substringBefore(zip, "-")} 
fn:toLowerCase 轉(zhuǎn)為小寫(xiě) ${fn.toLowerCase(product.name)} 
fn:toUpperCase 轉(zhuǎn)為大寫(xiě)字符 ${fn.UpperCase(product.name)} 
fn:trim 去除字符串前后的空格 ${fn.trim(name)}