poi之Excel上传

@RequestMapping(value = "/import", method = RequestMethod.POST)
	public String importFile(MultipartFile file,RedirectAttributes redirectAttributes) {
		log.debug("批量导入终端数据");
		/***
		 * 1,解析Excel 得到List<TerminalSDMTExcel>
		 * 2，遍历，并处理list｛
		 * 		1，判断TerminalSDMTExcel是否为空
		 * 		2，判断id是否为空
		 * 		3，检验Excel中的数据是否合法
		 * 		4，TerminalSDMTExcel转TerminalSDMT
		 * 		5，入库｛
		 * 				1，判断是否存在：存在则跳过
		 * 				2，入库
		 * 				｝
		 * ｝
		 * 3、提示批量导入商户结果
		 */
		try {
			int successNum = 0;
			int failureNum = 0;
			StringBuilder failureMsg = new StringBuilder();
			ImportExcel ei = new ImportExcel(file, 1, 0);
			List<TerminalSDMTExcel> list = ei.getDataList(TerminalSDMTExcel.class);
			TerminalSDMT Terminal = null;
			for (int i=0; i < list.size(); i++) {
				TerminalSDMTExcel entity = list.get(i);
				try {
					//是否为空，如果没有，直接跳过
					if (valiBoolean(entity)){
                                                //判断entity中各字段是否合法
						Map<String,Object> maps = checkMerchantExcel(entity);
						boolean flags = (Boolean) maps.get("flag");
						StringBuilder checkcontext = (StringBuilder) maps.get("content");
						log.debug("判断输入值是否合法");
						//判断输入值是否合法
						if(flags){
							//合法
                                                        //转换
							Terminal = excelSwitchEntity(entity);
							//插入
							Map<String,Object> map = TerminalSDMTService.save(Terminal);
							String flag = (String) map.get(SysConst.RESULT);
							/**
							 * =0,成功
							 * =-1,失败
							 */
							if("-1".equals(flag)){
								//商户已存在
								failureMsg.append("
终端编号" + entity.getTermCode()+ " 已存在; ");
								failureNum++;
							}if("0".equals(flag)){
								//成功
								successNum++;
							}
						}else{
							//不合法
							failureMsg.append("
终端编号:" + entity.getTermCode()+ ",失败原因:"+checkcontext.toString());
							failureNum++;
						}
					}else{
						if(Strings.isNullOrEmpty(entity.getMerchantId()) || Strings.isNullOrEmpty(entity.getTermCode())){
							failureMsg.append("
失败原因:第"+ (i+3)+"行，商户、终端编号为必填项");
							failureNum++;
						}else{
							failureMsg.append("
终端编号:" + entity.getTermCode()+ ",失败原因:所有项均为必填项 ");
							failureNum++;
						}
					}
				}
				catch (Exception ex) {
					failureMsg.append("
终端编号 " + entity.getTermCode() + " 导入失败："+ ex.getMessage());
				}
			}
			if (failureNum > 0) {
				failureMsg.insert(0, "，失败 " + failureNum + " 条终端信息，导入信息如下：");
			}
			addMessage(redirectAttributes, "已成功导入 " + successNum + " 条终端信息"+ failureMsg);
		} catch (Exception e) {
			addMessage(redirectAttributes, "导入终端信息失败！失败信息：" + e.getMessage());
		}
		return "redirect:";
	}
注意实体映射规则