JSP 自定义 taglib

<?xml version="1.0" encoding="UTF-8" ?>
 
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
  version="2.0">
  
  <!--描述,名字，版本自己随便写-->
  <description>toolLib 1.0 functions library</description>
  <display-name>toolLib 1.0 functions</display-name>
  <tlib-version>1.1</tlib-version>
  <!--自定义的标签，就像jstl的<c:>一样-->
  <short-name>auf</short-name>
  <!--uri-->
  <uri>http://java.sun.com/jsp/jstl/functionss</uri>
 
  <function>
    <description>
	简单描述
    </description>
    <!--需要调用的Java的方法-->
    <name>getTool</name>
    <!--对应的Java文件-->
    <function-class>net.cxiny.util.ToolLib</function-class>
    <!--方法签名-->
    <function-signature>int getTool(int)</function-signature>
    <example>
	示例说明
    </example>
  </function>
 
</taglib>

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

<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
  version="2.0">
    
  <description>JSTL 1.1 functions library</description>
  <display-name>JSTL functions sys</display-name>
  <tlib-version>1.1</tlib-version>
  <short-name>fns</short-name>
  <uri>http://java.sun.com/jsp/jstl/functionss</uri>

  <!-- Encodes -->
  <function>
    <description>URL编码</description>
    <name>urlEncode</name>
    <function-class>com.jeeplus.common.utils.Encodes</function-class>
    <function-signature>java.lang.String urlEncode(java.lang.String)</function-signature>
    <example>${fns:urlEncode(part)}</example>  
  </function>
  <function>
    <description>URL解码</description>
    <name>urlDecode</name>
    <function-class>com.jeeplus.common.utils.Encodes</function-class>
    <function-signature>java.lang.String urlDecode(java.lang.String)</function-signature>
    <example>${fns:urlDecode(part)}</example>  
  </function>
  <function>
    <description>HTML编码</description>
    <name>escapeHtml</name>
    <function-class>com.jeeplus.common.utils.Encodes</function-class>
    <function-signature>java.lang.String escapeHtml(java.lang.String)</function-signature>
    <example>${fns:escapeHtml(html)}</example>  
  </function>
  <function>
    <description>HTML解码</description>
    <name>unescapeHtml</name>
    <function-class>com.jeeplus.common.utils.Encodes</function-class>
    <function-signature>java.lang.String unescapeHtml(java.lang.String)</function-signature>
    <example>${fns:unescapeHtml(html)}</example>  
  </function>
  
  <!-- StringUtils -->
  <function>
    <description>从后边开始截取字符串</description>
    <name>substringAfterLast</name>
    <function-class>org.apache.commons.lang3.StringUtils</function-class>
    <function-signature>java.lang.String substringAfterLast(java.lang.String, java.lang.String)</function-signature>
    <example>${fns:substringAfterLast(str,separator)}</example>  
  </function>
  <function>
    <description>判断字符串是否以某某开头</description>
    <name>startsWith</name>
    <function-class>org.apache.commons.lang3.StringUtils</function-class>
    <function-signature>boolean startsWith(java.lang.CharSequence, java.lang.CharSequence)</function-signature>
    <example>${fns:startsWith(str,prefix)}</example> 
  </function>
  <function>
    <description>判断字符串是否以某某结尾</description>
    <name>endsWith</name>
    <function-class>org.apache.commons.lang3.StringUtils</function-class>
    <function-signature>boolean endsWith(java.lang.CharSequence, java.lang.CharSequence)</function-signature>
    <example>${fns:endsWith(str,suffix)}</example> 
  </function>
  <function>
    <description>缩写字符串，超过最大宽度用“...”表示</description>
    <name>abbr</name>
    <function-class>com.jeeplus.common.utils.StringUtils</function-class>
    <function-signature>java.lang.String abbr(java.lang.String, int)</function-signature>
    <example>${fns:abbr(str,length)}</example>  
  </function>
  <function>
    <description>替换掉HTML标签</description>
    <name>replaceHtml</name>
    <function-class>com.jeeplus.common.utils.StringUtils</function-class>
    <function-signature>java.lang.String replaceHtml(java.lang.String)</function-signature>
    <example>${fns:replaceHtml(html)}</example>  
  </function>
  <function>
    <description>转换为JS获取对象值，生成三目运算返回结果。</description>
    <name>jsGetVal</name>
    <function-class>com.jeeplus.common.utils.StringUtils</function-class>
    <function-signature>java.lang.String jsGetVal(java.lang.String)</function-signature>
    <example>${fns:jsGetVal('row.user.id')}  返回：!row?'':!row.user?'':!row.user.id?'':row.user.id</example>  
  </function>
  
  <!-- DateUtils -->
  <function>
    <description>获取当前日期</description>
    <name>getDate</name>
    <function-class>com.jeeplus.common.utils.DateUtils</function-class>
    <function-signature>java.lang.String getDate(java.lang.String)</function-signature>
    <example>${fns:getDate(pattern)}</example>  
  </function>
  <function>
    <description>获取过去的天数</description>
    <name>pastDays</name>
    <function-class>com.jeeplus.common.utils.DateUtils</function-class>
    <function-signature>long pastDays(java.util.Date)</function-signature>
    <example>${fns:pastDays(date)}</example>  
  </function>
  <function>
    <description>将日期对象Date转为标准格式字符串yyyy-mm-dd hh:mm:ss显示</description>
    <name>formatDateTime</name>
    <function-class>com.jeeplus.common.utils.DateUtils</function-class>
    <function-signature>java.lang.String formatDateTime(java.util.Date)</function-signature>
    <example>${fns:formatDateTime(date)}</example>  
  </function>
  <!-- JsonMapper -->
  <function>
    <description>对象转换JSON字符串</description>
    <name>toJson</name>
    <function-class>com.jeeplus.common.mapper.JsonMapper</function-class>
    <function-signature>java.lang.String toJsonString(java.lang.Object)</function-signature>
    <example>${fns:toJson(object)}</example>  
  </function>
  
  <function>
    <description>根据编码获取用户对象</description>
    <name>getByLoginName</name>
    <function-class>com.jeeplus.modules.sys.utils.UserUtils</function-class>
    <function-signature>com.jeeplus.modules.sys.entity.User getByLoginName(java.lang.String)</function-signature>
    <example>${fns:getByLoginName(loginName)}</example>  
  </function>


  <function>
    <description>判断是否是图片</description>
    <name>isImage</name>
    <function-class>com.jeeplus.modules.aqsc.util.Utils</function-class>
    <function-signature>boolean isImage(java.lang.String)</function-signature>
    <example>${fns:isImage(path)}</example>
  </function>
  <function>
    <description>获取文件缩略图</description>
    <name>getFileIcon</name>
    <function-class>com.jeeplus.modules.aqsc.util.Utils</function-class>
    <function-signature>java.lang.String getFileIcon(java.lang.String)</function-signature>
    <example>${fns:isImage(path)}</example>
  </function>
 
</taglib>

<%@ taglib prefix="fns" uri="/WEB-INF/tlds/fns.tld" %>

<function>
    <description>获取字典对象列表</description>
    <name>getDictList</name>
    <function-class>com.jeeplus.modules.sys.utils.DictUtils</function-class>
    <function-signature>java.util.List getDictList(java.lang.String)</function-signature>
    <example>${fns:getDictList(type)}</example>  
  </function>

<c:forEach items="${fns:getDictList('act_category')}" var="dict">
	<option value="${dict.value}">${dict.label}</option>
</c:forEach>

或

${fns:getDictLabel(model.category,'act_category','无分类')}

或

<fmt:formatDate value="${model.createTime}" pattern="yyyy-MM-dd HH:mm:ss"/>