JSTL中怎么遍历获取MAP 的键 和值

Question

JSTL中怎么遍历获取MAP 的键 和值

    List<Record>rolelist = RoleModel.roleDao.getRolelist();
    List<Map<String, String>>rolesMap = new ArrayList<Map<String, String>>();
    for(Record role : rolelist){
        Map<String, String> map=new HashMap<String,String>();
        map.put(role.getStr("r_name"), ","+role.getStr("role_id")+",");
        rolesMap.add(map);        
    }
    System.out.println(rolesMap.size());
    setAttr("maplist", rolesMap);
    setAttr("flowstep", flowstep);

前台遍历取不到（entry.key和entry.value取不到要怎么取啊）
<c:forEach items="${maplist}" var="entry">

    <span>
       <input type="checkbox" name="role_id" value="${entry.value}" class="rids"/>    
       <span>${entry.key}</span>
    </span>

</c:forEach>

Answer 1

maplist(rolesMap)是List套Map，所以<c:forEach>也要套两层：

<c:forEach items="${maplist}" var="map">
    <c:forEach items="${map}" var="entry">
        <span>
           <input type="checkbox" name="role_id" value="${entry.value}" class="rids"/>    
           <span>${entry.key}</span>
        </span>
    </c:forEach>
</c:forEach>