jstl的fn常用方法库

你的名字 2022-10-01 02:47 146阅读 0赞

<center>  
    fn:endsWith()方法判断某字符是否以指定的参数结尾<br>  
    fn:startsWith()方法判断某字符是否以指定的参数开始<br>  
<table>  
    <c:forEach var="file" items="$\{files \}">  
        <tr>  
            <td>$\{file.name \}</td>  
            <td>  
            <c:choose>  
                <c:when test="$\{fn:startsWith(file.name,'I')\}">Intel</c:when>  
                <c:otherwise>  
                    <c:if test="$\{fn:endsWith(file.name,'.txt') \}">  
                        文本文件  
                    </c:if>  
                </c:otherwise>  
            </c:choose>  
    </c:forEach>  
</table>  
查找子字符串  
fn:indexOf('filename.txt','.')=$\{fn:indexOf('filename.txt','.') \}<br>  
字符串分割<br>  
<c:set value="$\{fn:split(header\['accept'\],',') \}" var="names"/>  
<c:forEach items="$\{names \}" var="name">  
    $\{name \}<br>  
</c:forEach>  
length()方法可取字符串、数组、集合的长度:<br>  
"$\{pageContext.request.requestURL \}"的长度：$\{fn:length(pageContext.request.requestURI) \}<br>

</center>

演示效果:

fn:endsWith()方法判断某字符是否以指定的参数结尾  
fn:startsWith()方法判断某字符是否以指定的参数开始

<table style=""> 
 <tbody> 
  <tr> 
   <td>$360Section</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>$Recycle.Bin</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>.rnd</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>360SANDBOX</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>BOOTNXT</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>Documents and Settings</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>hiberfil.sys</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>hp</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>inetpub</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>Intel</td> 
   <td>Intel</td> 
  </tr> 
  <tr> 
   <td>pagefile.sys</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>PerfLogs</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>Program Files</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>Program Files (x86)</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>ProgramData</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>Recovery</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>swapfile.sys</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>SWSetup</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>System Volume Information</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>SYSTEM.SAV</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>Users</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td>WiFi_Log.txt</td> 
   <td>文本文件</td> 
  </tr> 
  <tr> 
   <td>Windows</td> 
   <td>&nbsp;</td> 
  </tr> 
 </tbody> 
</table>

查找子字符串 fn:indexOf('filename.txt','.')=8  
字符串分割  
text/html  
application/xhtml+xml  
application/xml;q=0.9  
image/webp  
\*/\*;q=0.8  
length()方法可取字符串、数组、集合的长度:  
"http://localhost:8080/ELTest/index3.jsp"的长度：18