注意，實現的方法必須是靜態的

<%...@ taglib uri="<c:forEach var="vote" items="${votes}">
        <tr>
            <td>${vote.name}</td>
            <td>${vote.title}</td>
            <td>${vote:votetype(vote.votetype)}</td>
            <td>${vote:pictype(vote.pictype)}</td>
            <td align="center">
                  <a href="vote_update.jsp?id=${vote.id}">修改投票</a>
                <a href="<%=context %>/deleteVote.do?id=${vote.id}">刪除投票</a>
                <a href="voteitem_updatein.jsp?id=${vote.id}">修改選項</a>
            </td>
        </tr>
        </c:forEach>
 

<?xml version="1.0" encoding="UTF-8" ?>

<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee     version="2.0">
   <description>vote function library</description>
   <display-name>Vote</display-name>
   <tlib-version>1.0</tlib-version>
   <short-name>vote</short-name>
   <uri>http://hxex.cn/vote</uri>
  
   <function>
     <name>votetype</name>
     <function-class>cn.hxex.vote.util.VoteFunction</function-class>
     <function-signature>java.lang.String votetype(java.lang.String)</function-signature>
   </function>
  
   <function>
     <name>pictype</name>
     <function-class>cn.hxex.vote.util.VoteFunction</function-class>
     <function-signature>java.lang.String pictype(java.lang.String)</function-signature>
   </function>
  
    <function>
     <name>votetypeoptions</name>
     <function-class>cn.hxex.vote.util.VoteFunction</function-class>
     <function-signature>java.lang.String votetypeoptions(java.lang.String)</function-signature>
   </function>
  
    <function>
     <name>pictypeoptions</name>
     <function-class>cn.hxex.vote.util.VoteFunction</function-class>
     <function-signature>java.lang.String pictypeoptions(java.lang.String)</function-signature>
   </function>
  
</taglib>
 

package cn.hxex.vote.util;

public class VoteFunction ...{
    public static String votetype(String votetype)...{
       
        return SelectConst.getVoteTypeTitle(votetype);
    }
    public static String votetypeoptions(String defaultValue)...{
        return SelectConst.getVoteTypeOptions(defaultValue);
    }
    public static String pictype(String pictype)...{
        return SelectConst.getPicTypeTitle(pictype);
    }
    public static String pictypeoptions(String defaultValue)...{
        return SelectConst.getPicTypeoptions(defaultValue);
    }
}
http://blog.csdn.net/daryl715/archive/2007/02/11/1507387.aspx