excel 데이터가java 대상으로 해석됨

public List readExcel(Class clazz, InputStream inputStream) throws Exception {
    Workbook workbook = ExcelUtil.getWorkbook(inputStream);
    if (workbook == null)
        return null;
    Sheet sheet = workbook.getSheetAt(0);
    Class> aClass = Class.forName(clazz.getName());

    Field[] fields = clazz.getDeclaredFields();
    List objList = new ArrayList<>();
    T obj;
    int lastRowNum = sheet.getLastRowNum();

    for (int i = 1; i <= lastRowNum; i++) {
        Row row = sheet.getRow(i);
        obj = (T) aClass.newInstance();
        if(row.getCell(0) == null)
            continue;
        for (int j = 0; j < fields.length; j++) {
            Cell cell = row.getCell(j);
            if(cell == null)
                continue;
            fields[j].setAccessible(true);
            fields[j].set(obj, ExcelUtil.getCellData(cell, fields[j].getType()));
        }
        objList.add(obj);
    }
    return objList;
}

private static Logger logger= LogManager.getLogger(ExcelUtil.class);
public static Workbook getWorkbook(InputStream inputStream){
    try {
        return WorkbookFactory.create(inputStream);
    }catch (Exception e){
        logger.error(" workbook ",e);
    }finally {
        if(inputStream !=null){
            try {
                inputStream.close();
            } catch (IOException e) {}
        }
    }
    return null;
}

/**
 *  excel 
 * @param cell
 * @param clazz
 * @param 
 * @return
 * @throws NumberFormatException
 * @throws ClassCastException
 */
public static  T getCellData(Cell cell,Class clazz) throws NumberFormatException,ClassCastException{

    T value=null;
    switch (cell.getCellType()){
        case Cell.CELL_TYPE_STRING:
            String strValue = cell.getStringCellValue();
            if(Integer.class==clazz)
                Integer.valueOf(strValue);
            else
                value= (T) strValue;
            break;
        case Cell.CELL_TYPE_NUMERIC:
            if(Double.class==clazz)
                value = (T) Double.valueOf(cell.getNumericCellValue());
            if(Integer.class==clazz)
                value=(T)Integer.valueOf(((Double)cell.getNumericCellValue()).intValue());
            if(String.class==clazz){
                strValue=String.valueOf(cell.getNumericCellValue());
                if(strValue.endsWith(".0")){
                    value= (T) strValue.substring(0,strValue.lastIndexOf("."));
                }else {
                    value= (T) strValue;
                }
            }
            break;
        case Cell.CELL_TYPE_FORMULA:
            value = (T) cell.getStringCellValue();
            break;
        case Cell.CELL_TYPE_BLANK:
            value= (T) cell.getStringCellValue();
            break;
        case Cell.CELL_TYPE_BOOLEAN:
            if(Boolean.class==clazz)
                value= (T) Boolean.valueOf(cell.getBooleanCellValue());
            break;
        case Cell.CELL_TYPE_ERROR:
            if(Byte.class==clazz)
                value= (T) Byte.valueOf(cell.getErrorCellValue());
            break;
        default:
            value=null;
    }
    return value;
}