jquery传输文件到后端，后端处理数据。

<!--HTML代码-->
<input type="file" name="uploadFile" id="uploadFile">
<!--JQuery代码-->
$("#uploadFile").on("change", function() {

		debugger;
		var obj=$("#uploadFile")[0].files;
		var formData = new FormData();                      // 创建一个form类型的数据

		formData.append('file',obj[0]);     // 获取上传文件的数据

		$.ajax({

			"url": "",

			"type": "",

			"processData": false, // 将数据转换成对象，不对数据做处理，故 processData: false

			"contentType": false,    // 不设置数据类型

			"xhrFields": {                // 这样在请求的时候会自动将浏览器中的cookie发送给后台

				withCredentials: true

			},

　　　　		"data": formData,

			success: function(data) {

				console.log(data)

			},

			error: function(data) {

			}

		})

	})

后端代码

			// 取得上传的文件
			MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
			CommonsMultipartFile file = (CommonsMultipartFile) multipartRequest.getFile("file");

			// 得到文件名称
			String realFileName = file.getOriginalFilename();
			String suffix = realFileName.substring(realFileName.indexOf("."),
					realFileName.length());

			Workbook workbook = null;
			//判断文件类型（可忽略）
			if (".xlsx".equals(suffix)) {
				workbook = new XSSFWorkbook(file.getInputStream());
			} else {
				workbook = new HSSFWorkbook(file.getInputStream());
			}

			List<WGxZdywCrm> empList = getEmpList(workbook);
			message=JSONObject.fromObject(empList);

后端可以将获取的文件传到服务器，也可以将文件内容解析出来。

文件内容解析（excel文件）放入对象

List<WGxZdywCrm> wGxZdywCrmList = new ArrayList<>();
		SimpleDateFormat dateFormatUtil=new SimpleDateFormat("yyyy-MM-dd hh-mm-ss");
		Sheet sheet = wookbook.getSheetAt(0);//统计excel的行数
		int rowLen = sheet.getPhysicalNumberOfRows();//excel总行数，记录数=行数-1
		for (int i = 1; i < rowLen; i++) {
			WGxZdywCrm wGxZdywCrm = new WGxZdywCrm();
			Row row = sheet.getRow(i);
			int startCol = 0;
			if (row != null) {
				String fZdywSort = getValue(row.getCell(startCol++));//getValue下面贴出来了
				String fZdywCrmno = getValue(row.getCell(startCol++));
				String fZdywBusinesscode = getValue(row.getCell(startCol++));
				String fZdywContractno = getValue(row.getCell(startCol++));
				String fZdywCustomercount = getValue(row.getCell(startCol++));
				String fZdywPhonecount = getValue(row.getCell(startCol++));
				String fZdywAccepttime = getValue(row.getCell(startCol++));
				String fZdywFinishtime = getValue(row.getCell(startCol++));
				String fZdywNote = getValue(row.getCell(startCol++));
				wGxZdywCrm.setFZdywSort(Long.valueOf(fZdywSort));
				wGxZdywCrm.setFZdywCrmno(fZdywCrmno);
				wGxZdywCrm.setFZdywBusinesscode(fZdywBusinesscode);
				wGxZdywCrm.setFZdywContractno(fZdywContractno);
				wGxZdywCrm.setFZdywCustomercount(fZdywCustomercount);
				wGxZdywCrm.setFZdywPhonecount(fZdywPhonecount);
				wGxZdywCrm.setFZdywAccepttime(dateFormatUtil.parse(fZdywAccepttime));
				wGxZdywCrm.setFZdywFinishtime(dateFormatUtil.parse(fZdywFinishtime));
				wGxZdywCrm.setFZdywNote(fZdywNote);
				wGxZdywCrmList.add(wGxZdywCrm);
			}
		}
		return wGxZdywCrmList;

获取内容

private String getValue(Cell cell) {
		if (cell == null)
			return "";
		if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
			return String.valueOf(cell.getBooleanCellValue()).trim();
		} else if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
			DecimalFormat df = new DecimalFormat("#");
			return String.valueOf(df.format(cell.getNumericCellValue())).trim();
		} else {
			cell.setCellType(cell.CELL_TYPE_STRING);
			return String.valueOf(cell.getStringCellValue()).trim();
		}
	}