📄 length.jsp

📁 JSP2.0实用教程实例源码

💻 JSP

字号:

<%@ 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 &#149; length</title>
</head>
<body>
<c:set var="testString1" value="欢迎您到北京来！"/>
<c:set var="testString2" value="Welcome to Beijing!"/>
<%
    request.setAttribute("mymap", new java.util.HashMap());
%>
<c:set target="${mymap}" property="name" value="陈龙"/>
<c:set target="${mymap}" property="email" value="chenlong@hellobeijing.org"/>
<c:set target="${mymap}" property="favourite" value="体育"/>

<h4>fn:length</h4>
<table cellpadding="5" border="1">
  <tr>
    <th align="left">输入参数</th>
    <th>函数结果</th>
  </tr>
  <tr>
    <td>${testString1}</td>
    <td>${fn:length(testString1)}</td>
  </tr>
  <tr>
    <td>${testString2}</td>
    <td>${fn:length(testString2)}</td>
  </tr>
  <tr>
    <td>${mymap}</td>
    <td>${fn:length(mymap)}</td>
  </tr>
  <tr>
    <td>长度为0的字符串</td>
    <td>${fn:length("")}</td>
  </tr>
  <tr>
    <td>不存在的变量（null）</td>
    <td>${fn:length(hello)}</td>
  </tr>
</table>
</body>
</html>

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