java接前台file(EXCEL)，并解析

前台代码:

function fileChange(){ $('#file_form').submit(); }

后台代码:

@Controller
@RequestMapping("/whiteList")
public class WhiteListControll {

@RequestMapping("/uploadFile")
@ResponseBody
public String uploadFile(HttpServletRequest request) {
    request.getParameter("fileHiden");//没拿到
  // TODO
    return ""
}

}

问题描述：
我在后台怎么样才能拿到前台过来的FILE？
并且遍历Excel的第一列，Insert到数据库中

String fields = "traceCode";

CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
MultipartHttpServletRequest multipartRequest = multipartResolver.resolveMultipart(request);
Iterator fileNames = multipartRequest.getFileNames();
if(fileNames.hasNext()) {
String name = (String) fileNames.next();
CommonsMultipartFile multipartFile = (CommonsMultipartFile) multipartRequest.getFile(name);
InputStream in = null;
String fileName=multipartFile.getFileItem().getName();

    String [] s=fileName.split("\\.");
    try {

        List<Map> detailMaps = new ArrayList<Map>();
        String[] field={"traceCode"};
        if(s[1].equals("xls")){
            HSSFWorkbook hwb = new HSSFWorkbook(in);
            detailMaps=ExcelUtils.readDataFromExcelFor(hwb,field,1,0);
        }else{
            XSSFWorkbook xwb = new XSSFWorkbook(in);
            detailMaps=ExcelUtils.readDataFromExcelFor(xwb,field,1,0);
        }
}catch(Exception e){

    logger.info("*********************");
    }

public static List readDataFromExcelFor(HSSFWorkbook workbook,String[] fields,int startRow,int startCol){
ArrayList list = new ArrayList();
HSSFSheet sheet = workbook.getSheetAt(0);
int rowCount = sheet.getPhysicalNumberOfRows();
HSSFFormulaEvaluator formulaEvaluator = new HSSFFormulaEvaluator(workbook);
// 设置单元格内容
HSSFRow _row;
for(int i=startRow;i<=rowCount-1;i++){
_row = sheet.getRow(i);
if(_row!=null){
HashMap map = new HashMap();
int col = fields.length;
for(int j=startCol;j<col;j++){
Object cellValue = null;
HSSFCell cell = _row.getCell(j);
if(cell != null){

                    try {
                        //测试强制日期。如果能转
                        if(HSSFDateUtil.isCellDateFormatted(cell)){
                            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                            String  str = sdf.format(HSSFDateUtil.getJavaDate(cell.getNumericCellValue())).toString();
                            cell.setCellValue(str);
                        }
                    }catch (Exception e){
                        logger.info("-------------"+e.getMessage());
                    }


                    HSSFCellStyle s = cell.getCellStyle();
                    short dataFormat = s.getDataFormat();

                    // 设置单元格的值
                    if(cell.getCellType() == HSSFCell.CELL_TYPE_STRING){
                        cellValue = cell.getStringCellValue();
                    }else if(cell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC){
                        cellValue = (cell.getNumericCellValue());//处理下小数位,todo:这么写法会丢失小数精度
                        if(dataFormat!=0){
                            if(HSSFDateUtil.isCellDateFormatted(cell)){
                                //日期格式化
                                cellValue = cell.getDateCellValue();

                            }else{
                                //数字格式化
                                if(dataFormat>0){{
                                    DecimalFormat decimalFormat=new DecimalFormat(s.getDataFormatString().replace("\\","").replace("\"",""));
                                    cellValue = decimalFormat.format(cell.getNumericCellValue());
                                }}
                            }
                        }
                    }else  if (cell.getCellType()== HSSFCell.CELL_TYPE_FORMULA){
                        String ret = "";
                        int retType = formulaEvaluator.evaluateFormulaCell(cell);
                        try {
                            switch (retType) {
                                case HSSFCell.CELL_TYPE_BLANK:
                                    break;

                                case HSSFCell.CELL_TYPE_BOOLEAN:
                                    ret = String.valueOf(cell.getBooleanCellValue());
                                    break;

                                case HSSFCell.CELL_TYPE_ERROR:
                                    ret = "";
                                    break;

                                case HSSFCell.CELL_TYPE_NUMERIC:
                                    ret = String.valueOf(cell.getNumericCellValue());
                                    if(HSSFDateUtil.isCellDateFormatted(cell)){
                                        //日期格式化
                                        Date dateCellValue = cell.getDateCellValue();
                                        String dataFormatString = s.getDataFormatString();
                                        dataFormatString = dataFormatString.replaceAll("y+", "yyyy").replaceAll("d+","dd").replace("m","M");
                                        SimpleDateFormat simpleDateFormat=new SimpleDateFormat(dataFormatString);
                                        ret = simpleDateFormat.format(dateCellValue);
                                    }else{
                                        //数字格式化
                                        if(dataFormat>0){
                                            DecimalFormat decimalFormat=new DecimalFormat(s.getDataFormatString().replace("\\","").replace("\"",""));
                                            ret = decimalFormat.format(cell.getNumericCellValue());
                                        }
                                    }
                                    break;

                                case HSSFCell.CELL_TYPE_STRING:
                                    ret = cell.getRichStringCellValue().getString();
                                    break;

                                default:
                                    break;
                            }
                        } catch (Exception e) {
                            logger.error("Excel模板公式:"+e.getMessage());
                        }
                        cellValue = ret;
                    }
                }
                map.put(fields[j-startCol],cellValue);
            }
            list.add(map);
        }
    }
    return list;
}

改改就能用了