现有List<DeviceVO> list，DeviceVO有属性area(地名)，up_status_1(状态，在线为“101”或“201”)；根据area地名分组统计up_status_1在线数，离线数，并统计总数组？返回的结果为List<G4DeviceStateVO> rList，G4DeviceStateVO有属性totalNum， onlineNum， offlineNum，area_name。
思路：在map中写入key为DeviceVO的地名area，value为对应DeviceVO的List；再对map中的key对应的list进行统计，将结果写入G4DeviceStateVO中后拼成List。
List<DeviceVO>list=deviceMgrService.getDeviceDataInfo(deviceVO); List<G4DeviceStateVO> rList = new ArrayList<G4DeviceStateVO>(); HashMap<String,List<DeviceVO>> map = new HashMap<String,List<DeviceVO>>(); for(DeviceVO deviceVO : list){ List<DeviceVO> tempList = map.get(deviceVO.getArea()); if(tempList == null){ tempList = new ArrayList(); tempList.add(deviceVO); map.put(deviceVO.getArea(), tempList); } else{ tempList.add(deviceVO); } } int Totalonline = 0; int Totaloffline = 0; for(String area : map.keySet()){ int online = 0; int offline = 0; for(DeviceVO deviceVO :map.get(area)){ if(("101").equals(deviceVO.getUp_status_1())||("201").equals(deviceVO.getUp_status_1())){ online++; Totalonline++; }else{ offline++; Totaloffline++; } } G4DeviceStateVO g4DeviceStateVO = new G4DeviceStateVO(); g4DeviceStateVO.setArea_name(area); g4DeviceStateVO.setTotalNum(String.valueOf(online+offline)); g4DeviceStateVO.setOnlineNum(String.valueOf(online)); g4DeviceStateVO.setOfflineNum(String.valueOf(offline)); rList.add(g4DeviceStateVO); } G4DeviceStateVO g4 = new G4DeviceStateVO(); g4.setArea_name("总计"); g4.setTotalNum(String.valueOf(Totalonline+Totaloffline)); g4.setOnlineNum(String.valueOf(Totalonline)); g4.setOfflineNum(String.valueOf(Totaloffline)); rList.add(g4);