根据导入xlxs的文件，来写入数据库

@AuthorityAnnotation("game_server_poi")
	@RequestMapping(value="/gameServerPoi",method = RequestMethod.POST, produces = MediaType.MULTIPART_FORM_DATA_VALUE)
	public RetResult upload(@RequestParam("file") MultipartFile file,Integer gameId) {

		if(file.isEmpty()){
		    return RetResult.error("文件不能为空");
        }
		try {
			inputStream = file.getInputStream();
			XSSFWorkbook workbook = new XSSFWorkbook(inputStream);
			for (XSSFSheet xssfSheet : workbook) {
				//处理当前页循环读取每一行
				if (xssfSheet == null) {
					continue;
				}
				for (int runNum = 0; runNum < xssfSheet.getLastRowNum() + 1; runNum++) {
					XSSFRow row = xssfSheet.getRow(runNum);
					int minColIx = row.getFirstCellNum();
					int maxColIx = row.getLastCellNum();

					GameServer gameServer = new GameServer();
					gameServer.setGameId(gameId);
					for (int colIx = minColIx; colIx < maxColIx; colIx++) {
						XSSFCell cell = row.getCell(colIx);
						cell.setCellType(Cell.CELL_TYPE_STRING);
						if(colIx == 0){
							try {
								gameServer.setTime(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(cell.getStringCellValue()));
							} catch (ParseException e) {
								e.printStackTrace();
							}
						}
						if (colIx == 1) {
							gameServer.setServer(cell.getStringCellValue());
						}
					}
					gameserverService.insertSelective(gameServer);
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		}finally {
			try {
				inputStream.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return RetResult.success();
	}