📄 stringsubset.jsp
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<%@ page contentType="text/html;charset=GBk" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<html>
<head>
<title>JSTL 函数 • 字符串子串</title>
</head>
<body>
<c:set var="str1" value="2005.5.5-2008.8.8"/>
<c:set var="str2" value="欢迎您到北京来！Welcome to BeiJing!"/>
<b>fn:substring</b><br />
<table border="1">
<tr>
<th>输入串</th>
<th>开始位置</th>
<th>结束位置</th>
<th>结果子串</th>
</tr>
<tr>
<td>${str1}</td>
<td>9</td>
<td>-1</td>
<td>${fn:substring(str1, 9, -1)}</td>
</tr>
<tr>
<td>${str2}</td>
<td>11</td>
<td>17</td>
<td>${fn:substring(str2, 11, 17)}</td>
</tr>
<tr>
<td>${str2}</td>
<td>12</td>
<td>5</td>
<td> ${fn:substring(str2, 12, 5)}</td>
</tr>
<tr>
<td>${str2}</td>
<td>23</td>
<td>-1</td>
<td>${fn:substring(str2, 23, -1)}</td>
</tr>
<tr>
<td>${str2}</td>
<td>23</td>
<td>999</td>
<td>${fn:substring(str2, 23, 999)}</td>
</tr>
<tr>
<td>${str2}</td>
<td>-1</td>
<td>-1</td>
<td>${fn:substring(str2, -1, -1)}</td>
</tr>
<tr>
<td>${str2}</td>
<td>99</td>
<td>12</td>
<td> ${fn:substring(str2, 99, 12)}</td>
</tr>
<tr>
<td>空字符串</td>
<td>2</td>
<td>6</td>
<td> ${fn:substring("", 2, 6)}</td>
</tr>
<tr>
<td>不存在变量（null）</td>
<td>2</td>
<td>6</td>
<td> ${fn:substring(undefined, 2, 6)}</td>
</tr>
</table>
<b>fn:substringAfter</b><br />
<table border="1">
<tr>
<th>输入串</th>
<th>子串</th>
<th>结果子串</th>
</tr>
<tr>
<td>${str1}</td>
<td>-</td>
<td>${fn:substringAfter(str1, "-")}</td>
</tr>
<tr>
<td>${str2}</td>
<td>to</td>
<td>${fn:substringAfter(str2, "to")}</td>
</tr>
<tr>
<td>${str2}</td>
<td>北京</td>
<td>${fn:substringAfter(str2, "北京")}</td>
</tr>
<tr>
<td>${str2}</td>
<td>不存在</td>
<td> ${fn:substringAfter(str2, "不存在")}</td>
</tr>
<tr>
<td>${str2}</td>
<td>不存在变量（null）</td>
<td>${fn:substringAfter(str2, undefined)}</td>
</tr>
<tr>
<td>${str2}</td>
<td>空字符串</td>
<td>${fn:substringAfter(str2, "")}</td>
</tr>
<tr>
<td>空字符串</td>
<td>Welcome</td>
<td> ${fn:substringAfter("", "Welcome")}</td>
</tr>
<tr>
<td>不存在变量（null）</td>
<td>Welcome</td>
<td> ${fn:substringAfter(undefined, "Welcome")}</td>
</tr>
</table>
<b>fn:substringBefore</b><br/>
<table border="1">
<tr>
<th>输入串</th>
<th>子串</th>
<th>结果子串</th>
</tr>
<tr>
<td>${str1}</td>
<td>-</td>
<td>${fn:substringBefore(str1, "-")}</td>
</tr>
<tr>
<td>${str2}</td>
<td>to</td>
<td>${fn:substringBefore(str2, "to")}</td>
</tr>
<tr>
<td>${str2}</td>
<td>Welcome</td>
<td>${fn:substringBefore(str2, "Welcome")}</td>
</tr>
<tr>
<td>${str2}</td>
<td>不存在变量（null）</td>
<td> ${fn:substringBefore(str2, undefined)}</td>
</tr>
<tr>
<td>${str2}</td>
<td>空字符串</td>
<td> ${fn:substringBefore(str2, "")}</td>
</tr>
<tr>
<td>空字符串</td>
<td>Welcome</td>
<td> ${fn:substringBefore("", "Welcome")}</td>
</tr>
<tr>
<td>不存在变量（null）</td>
<td>Welcome</td>
<td> ${fn:substringBefore(undefined, "Welcome")}</td>
</tr>
</table>
</body>
</html>
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