EL表达式和代码片断互相取值

<c:set var="companyName" value="${companymap['company']}" scope="request"></c:set>

将el表达式的值setAttribute中，而后就能够在代码中直接使用companyName变量

EL表达式取片断值：

将代码片断中的属性或者集合setAttribute中，而后在页面EL表达式中获取${**}获取就行

片断取EL表达式值：

request.getAttribute("companyName") == EL表达式${companyName} 

eg:

//获取后台传过来的集合，取出其中重复的公司名称的项，并将（公司名，出现次数）放入map中，而后再存入页面中。
List<Map<String,String>> companyinformationLists = (List<Map<String,String>>)request.getAttribute("companyinfoLists");
Map<String, Integer> map = new HashMap<String, Integer>();
if(companyinformationLists != null){
	for(int i = 0; i < companyinformationLists.size(); i++){
		if(!map.containsKey(companyinformationLists.get(i).get("company"))){
	map.put(companyinformationLists.get(i).get("company"),1);
		}else{
	map.put(companyinformationLists.get(i).get("company"),1+map.get(companyinformationLists.get(i).get("company")));
		}
	}
	request.setAttribute("map",map);
}


<c:forEach var="companymap" items="${companyinfoLists}" varStatus="companynum">
<c:choose>
<c:when test="${map[companymap['company']] > 1}">
<tr>
  <c:set var="companyName" value="${companymap['company']}" scope="request"></c:set>
  <td width="22%" rowspan="${map[companymap['company']]}">${companymap['company']}</td>
  <td width="8%">${companymap['month']}</td>
  <td width="15%" rowspan="${map[companymap['company']]}">${companymap['agreementsystem']}</td>