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我有上傳一個Excel文件的頁面。如果有錯誤，我使用顯示標籤以表格格式顯示這些錯誤。顯示標籤如何工作？
一切正常，直到顯示。但是，如果我必須對數據進行排序或導出，那麼它會再次停止工作，並且它會重定向到同一頁面，而沒有任何數據。
我猜對於每一個操作（如排序和導出），它都會觸及數據庫，因此在下一個請求中它不會顯示任何數據，因爲它沒有獲取文件名。
任何人都可以解釋我是對還是錯？我是這個顯示標籤的新手。
這裏是我的JSP代碼的src：
</head>
<body>
<form:form id="formAdd" method="post" action="locationSave.do"
commandName="location">
<form:hidden path="id" />
<form:hidden path="isDeleted" />
<form:hidden path="remarks" />
<form:hidden path="status" />
<form:hidden path="updatedDt" />
<input type="hidden" value="${locationCodes}" id="codes">
<table style="width: 1000px; border:0; cellspacing:1; cellpadding=0; class=table_border; align :center;">
<tr>
<td colspan="6" class ="H1">
Location Master
</td>
</tr>
<tr>
<td colspan="6" class="H2">
Add Location
</td>
</tr>
<tr>
<td style="width: 16%;" class ="tdheader_left"><form:label path="code">
<spring:message code="label.loccode" />
</form:label></td>
<td style="width: 16%;" class="tdheader_textbox"><form:input
path="code" accesskey="o" cssClass="input" size="7" maxlength="5"
id="code" /></td>
<td style="width: 16%;" class ="tdheader_left"><form:label path="name">
<spring:message code="label.locname" />
</form:label></td>
<td style="width: 16%;" class="tdheader_textbox"><form:input
path="name" accesskey="n" class="input" maxlength="20" size="25"
id="name" /></td>
<td style="width: 16%;" class ="tdheader_left"><form:label path="locGrp">
<spring:message code="label.locGrp" />
</form:label></td>
<td style="width: 16%;" class="tdheader_dropdown"><form:select accesskey="g"
path="locGrp.id" class="input" id="grpId">
<form:option value="-1" label="--- Select ---" />
<form:options items="${locGrp}" />
</form:select></td>
</tr>
<tr>
<td colspan="6" align="center" class="H1">
<input id="save" accesskey="s" type="submit" value="Save"/>
<input id="reset" accesskey="r" type="reset" value="Reset" />
<input type="button" accesskey="c" value="Cancel" onclick="window.location = 'location.do';" />
<input type="button" id="upload_file"
accesskey="a" value="Upload File"
/></td>
</tr>
</table>
</form:form>
<div id="formUpload" style="text-align:center;display:block;">
<form:form id="formFile" method="post" action="locationFileUpload.do" commandName="file" enctype="multipart/form-data">
Please select a file to upload : <input type="file" name="file" />
<input type="submit" value="upload" id="success" />
<c:if test="${locErrorList != null}">
<div id="uploaderror">
Following locations could not be uploaded
<display:table uid="2" name="locErrorList" class="displaytag" id="locError" pagesize="10" excludedParams="*" requestURIcontext="true"
defaultorder="ascending" requestURI="locationFileUpload.do" export="true" >
<display:column property="code" sortable="true" title="Location Code" headerClass="sortable" />
<display:column property="name" sortable="true" title="Location Name" headerClass="sortable" />
<display:column property="error" sortable="true" title="Reason For Failure" headerClass="sortable" />
</display:table>
</div>
</c:if>
</form:form>
</div>
</body>
</html>