mybatis中resulttype如下定义即可：

 <!--查询订单状态表，返回一个map集合-->
    <select id="selOrdersState" resultType="java.util.HashMap">
        select state_id,state from order_state
    </select>

mapper接口：

 List<Map<Integer, String>> selOrdersState();

下面是将接收到的map进行处理：

 @Override
    public Map<Integer, String> selOrdersState() {
        Map<Integer, String> stateMap = new HashMap<>();
        List<Map<Integer, String>> mapList = orderMapper.selOrdersState();
        for (Map<Integer, String> map: mapList) {
            String state =null;
            Integer state_id = null;
            for (Map.Entry<Integer, String> maps:map.entrySet()) {
                System.out.println("key"+maps.getKey());
                //System.out.println("key"+maps.getValue());
                if("state_id".equals(maps.getKey())){
                    state_id = new Integer(String.valueOf(maps.getValue()));
                }
                if("state".equals(maps.getKey())){
                    state = String.valueOf(maps.getValue());
                }
                stateMap.put(state_id,state);
            }
        }
        return stateMap ;
    }