Detailed explanation of function examples for intercepting strings using EL expressions

This article mainly introduces the function description of EL expression to intercept strings. At the bottom of the article, I introduce to you the list of methods and their descriptions that come with JSTL. Friends who need it can refer to it. I hope it can help you.

Introducing the tag library

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

The following is a list of methods in JSTL and their descriptions

Function name function description usage example

fn:contains 判断字符串是否包含另外一个字符串 <c:if test="${fn:contains(name, searchString)}"> 
fn:containsIgnoreCase 判断字符串是否包含另外一个字符串(大小写无关) <c:if test="${fn:containsIgnoreCase(name, searchString)}"> 
fn:endsWith 判断字符串是否以另外字符串结束 <c:if test="${fn:endsWith(filename, ".txt")}"> 
fn:escapeXml 把一些字符转成XML表示，例如<字符应该转为< ${fn:escapeXml(param:info)} 
fn:indexOf 子字符串在母字符串中出现的位置 ${fn:indexOf(name, "-")} 
fn:join 将数组中的数据联合成一个新字符串，并使用指定字符格开 ${fn:join(array, ";")} 
fn:length 获取字符串的长度，或者数组的大小 ${fn:length(shoppingCart.products)} 
fn:replace 替换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 ${fn:split(customerNames, ";")} 
fn:startsWith 判断字符串是否以某个子串开始 <c:if test="${fn:startsWith(product.id, "100-")}"> 
fn:substring 获取子串 ${fn:substring(zip, 6, -1)} 
fn:substringAfter 获取从某个字符所在位置开始的子串
 ${fn:substringAfter(zip, "-")} 
fn:substringBefore 获取从开始到某个字符所在位置的子串 ${fn:substringBefore(zip, "-")} 
fn:toLowerCase 转为小写 ${fn.toLowerCase(product.name)} 
fn:toUpperCase 转为大写字符 ${fn.UpperCase(product.name)} 
fn:trim 去除字符串前后的空格 ${fn.trim(name)}

Related recommendations:

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Usage difference analysis of three common ways to intercept strings in javascript

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