No more nonsense, the specific code is as follows:

<span style="font-size:14px;">
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<table width="100%" border="0" cellspacing="0" cellpadding="0" >
<tr>
<th>
 Report name
</th>
</tr>
<c:set var="tempCount" value="0"></c:set><%-- Temporary variable  --%>
<c:set var="rowspanCount" value="0"></c:set><%-- Number of record merged columns  --%>
<c:set var="tempFrist" value="0"></c:set><%-- Record merge start position  --%>
<c:set var="tempEnd" value="-1"></c:set><%-- Record merge end position  --%>
<c:forEach items="${list}" var="accountConfig" varStatus="status" >
<tr>
<%-- Utilization 1 Result sets List<Bean> To generate, too much data will increase the burden on customers  --%>
<c:if test="${status.index>=tempEnd}">
<c:set var="rowspanCount" value="0"></c:set><%-- Clear historical data  --%>
<c:forEach var="item2" items="${list}" varStatus="status2">
<%-- tablename Refers to the attributes to be merged  --%>
<c:if test="${accountConfig.tablename==item2.tablename}">
<c:set var="tempFrist" value="${status.index }"></c:set>
<c:set var="rowspanCount" value="${rowspanCount+1 }"></c:set>
<c:set var="tempEnd" value="${tempFrist+rowspanCount }"></c:set>
</c:if>
</c:forEach>
</c:if>
<c:if test="${status.index==tempFrist}">
<td rowspan="${rowspanCount}">
<%-- tablename Refers to the attributes to be merged  --%>
${accountConfig.tablename}
</td>
</c:if>
</tr>
</c:forEach>
</table>
</span>