? ? ?最近做些前台页面表现层的工作，对这些东西好久没有接触了。遇到一些问题，总结一下：

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? ? * 自定义标签文件：

? ? ? ? ? ?在用自定义标签实现功能时候总是报错，如下：

javax.servlet.jsp.JspException: javax.el.PropertyNotFoundException: Property 'header' not found on type java.lang.String

具体代码如下：

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<%@tag pageEncoding="UTF-8" body-content="empty" import="com.express.platform.model.system.*"%> 
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<%@taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%@ attribute name="module"  required="true" rtexprvalue="true" %>  
  
   
   
<div class="index_model">
	 <div class="index_model_head">
		   <c:if test="${not empty module.header }">
			  	<c:if test="${not empty module.header.url }">
			  		<a href="${module.header.url }">
			  	</c:if>
			  	<c:if test="${not empty  module.header.text }">
			  		 ${module.header.text }
			  	</c:if>
			  	<c:if test="${not empty module.header.url }">		
			  		</a>
			  	</c:if>	
		  </c:if>
	 </div>
	   
	 <c:forEach items="${module.tabSelector }" var="tab">
	  	 <c:if test="${not empty tab.tab && not empty tab.tab.text}">
	  	 	<c:set  value="true" var="isShow" scope="page"></c:set>
	  	 </c:if> <c:remove var="tab"/>
	 </c:forEach>
	  
	 <c:if test="${not empty isShow && isShow == \"true\"}">
		 <div class="index_model_tab">
		 	<c:forEach items="${module.tabSelector }" var="tab">
		 		<div>${tab.tab.text }</div>
		 	</c:forEach>
		 </div> <c:remove var="tab"/>
	 </c:if>
	   
	 
	 <div class="clear"></div>
	 
	 <div class="index_model_content">
		 <c:forEach items="${module.tabSelector }" var="tab">
	 	 	<div class="index_model_tab_content">
		 	 	 <table> 
					<tr>
						<c:forEach items="${tab.columnsWidth }" var="colWidth">
							<td width="${colWidth }"></td>
						</c:forEach>
					</tr>
					
					 <c:forEach items="${tab.tableData }" var="rowData">
					 	<tr>
					 		<c:forEach items="${rowData }" var="colData" varStatus="index">
					 			<c:choose>
					 				<c:when test="${colData.type.type == \"url\" || colData.fold }">
					 					<td   class="index_model_column_main">
					 				</c:when>
					 				<c:otherwise>
					 					<td  >
					 				</c:otherwise> 
					 			</c:choose>
					 				<c:choose>
					 					<c:when test="${colData.type.type == \"img\" }">
					 						<img src="${colData.url }" />
					 					</c:when>
					 					<c:when test="${colData.type.type == \"url\"  }">
					 						<a href="${colData.url  }" title="${colData.text }">${colData.text }</a>
					 					</c:when>
					 					<c:otherwise>
					 						${colData.text }
					 					</c:otherwise>
					 				</c:choose> 
					 			</td>
					 		</c:forEach>
					 	</tr>
					 </c:forEach>
					 
				 </table>  
	   		</div> 
	   </c:forEach>
     </div>
   
	 <div class="clear"></div>  
   	 <div class="index_model_foot">
   	 	<c:forEach items="${module.footer }" var="footer" >
 				<c:choose>
 					<c:when test="${footer.type.type == \"img\" }">
 						<img src="${footer.url }" />
 					</c:when>
 					<c:when test="${footer.type.type == \"url\" }">
 						<a href="${footer.url  }" title="${footer.text }">${footer.text }</a>
 					</c:when>
 					<c:otherwise>
 						${footer.text }
 					</c:otherwise>
 				</c:choose>&nbsp;&nbsp;&nbsp;