自定义 jstl 标签 fns:jsp中tld的function自定义方法扩展

jsp中引入方式

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

fns.tld写法示例

<?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>

  <function>
    <description>获取管理路径</description>
    <name>getAdminPath</name>
    <!-- 该方法的实体所在类路径-->
    <function-class>com.us.yy.common.config.Global</function-class>
    <!-- 该方法的方法名，值得一提的是，这个方法必须是个static方法-->
    <function-signature>java.lang.String getAdminPath()</function-signature>
    <!--使用方法示例 -->
    <example>${fns:getAdminPath()}</example>
  </function>

  <function>
    <description>获取配置</description>
    <name>getConfig</name>
    <function-class>com.us.yy.common.config.Global</function-class>
    <function-signature>java.lang.String getConfig(java.lang.String)</function-signature>
    <example>${fns:getConfig(key)}</example>
  </function>
  <function>
    <description>获取常量</description>
    <name>getConst</name>
    <function-class>com.us.yy.common.config.Global</function-class>
    <function-signature>java.lang.Object getConst(java.lang.String)</function-signature>
    <example>${fns:getConst(key)}</example>
  </function>

  <!-- UserUtils -->
  <function>
    <description>获取当前用户对象</description>
    <name>getUser</name>
    <function-class>com.us.yy.modules.utils.UserUtils</function-class>
    <function-signature>com.us.yy.modules.entity.User getUser()</function-signature>
    <example>${fns:getUser()}</example>  
  </function>


  <function>
    <description>获取当前用户的菜单对象列表</description>
    <name>getMenuList</name>
    <function-class>com.us.yy.modules.utils.UserUtils</function-class>
    <function-signature>java.util.List getMenuList()</function-signature>
    <example>${fns:getMenuList()}</example>  
  </function>

    <function>
    <description>获取当前用户的菜单对象列表</description>
    <name>getTopMenu</name>
    <function-class>com.us.yy.modules.sys.utils.UserUtils</function-class>
    <function-signature>com.us.yy.modules.entity.Menu getTopMenu()</function-signature>
    <example>${fns:getTopMenu()}</example>  
  </function>
   <function>
    <description>获取当前时间与指定时间的差值</description>
    <name>getTime</name>
    <function-class>com.us.yy.modules.utils.UserUtils</function-class>
    <function-signature>java.util.Date getTime(java.util.Date)</function-signature>
    <example>${fns:getTime(java.util.Date)}</example>  
  </function>

  <function>
    <description>获取当前用户的部门对象列表</description>
    <name>getOfficeList</name>
    <function-class>com.us.yy.modules.utils.UserUtils</function-class>
    <function-signature>java.util.List getOfficeList()</function-signature>
    <example>${fns:getOfficeList()}</example>  
  </function>

  <function>
    <description>获取当前用户缓存</description>
    <name>getCache</name>
    <function-class>com.us.yy.modules.utils.UserUtils</function-class>
    <function-signature>java.lang.Object getCache(java.lang.String, java.lang.Object)</function-signature>
    <example>${fns:getCache(cacheName, defaultValue)}</example>  
  </function>

  <!-- DictUtils -->
  <function>
    <description>获取字典标签</description>
    <name>getDictLabel</name>
    <function-class>com.us.yy.modules.sys.utils.DictUtils</function-class>
    <function-signature>java.lang.String getDictLabel(java.lang.String, java.lang.String, java.lang.String)</function-signature>
    <example>${fns:getDictLabel(value, type, defaultValue)}</example>  
  </function>

  <function>
    <description>HTML编码</description>
    <name>escapeHtml</name>
    <function-class>com.us.yy.common.utils.Encodes</function-class>
    <function-signature>java.lang.String escapeHtml(java.lang.String)</function-signature>
    <example>${fns:escapeHtml(html)}</example>  
  </function>
  <function>
    <description>HTML解码</description>
    <name>unescapeHtml</name>
    <function-class>com.us.yy.common.utils.Encodes</function-class>
    <function-signature>java.lang.String unescapeHtml(java.lang.String)</function-signature>
    <example>${fns:unescapeHtml(html)}</example>  
  </function>

  <!-- DateUtils -->
  <function>
    <description>获取当前日期</description>
    <name>getDate</name>
    <function-class>com.us.yy.common.utils.DateUtils</function-class>
    <function-signature>java.lang.String getDate(java.lang.String)</function-signature>
    <example>${fns:getDate(pattern)}</example>  
  </function>

  <function>
    <description>对象转换JSON字符串</description>
    <name>toJson</name>
    <function-class>com.us.yy.common.mapper.JsonMapper</function-class>
    <function-signature>java.lang.String toJsonString(java.lang.Object)</function-signature>
    <example>${fns:toJson(object)}</example>  
  </function>

</taglib>

实体中

/**
     * 获取当前用户授权菜单
     * @return
     */
    public static Menu getTopMenu(){
        Menu topMenu =  getMenuList();
        return topMenu;
    }

jsp中使用示例

$(document).ready(function() {
        var data = ${fns:toJson(new Data())};
});

<c:set var="ctx" value="${fns:getAdminPath()}"/>

<t:oldMenu menu="${fns:getTopMenu()}"></t:oldMenu> //下篇讲述自定义标签