How to read empty cell in Excel file using POI? - excel

Question

How to read empty cell in excel file using POI?
When I upload Excel file, the empty cell is filled with previous cell.
like this:
this is the sample of excel file
this is the DB that the empty cell be filled with previous cell
POI VERSION
org.apache.poi
poi
4.1.2
org.apache.poi
poi-ooxml
4.1.2
code
#RequestMapping("/mng/mngSaupExcelUpload14.do")
public ModelAndView mngBizApplyExcelUpload14(MultipartHttpServletRequest request, HttpServletResponse response,
HttpSession session, INDEYearVO attach) throws IOException, ParseException {
Iterator<String> iterator = request.getFileNames();
int actResult = 0;
ModelAndView mav = new ModelAndView();
response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
MultipartFile mFile = null;
while (iterator.hasNext()) {
String uploadFileName = iterator.next();
mFile = request.getFile(uploadFileName);
// String originFileName = mFile.getOriginalFilename();
// String saveFileName = originFileName;
}
XSSFWorkbook workbook = new XSSFWorkbook(mFile.getInputStream());
for (int sheetNum = 0; sheetNum < workbook.getNumberOfSheets(); sheetNum++) {
XSSFSheet sheet = workbook.getSheetAt(sheetNum);
int rows = sheet.getPhysicalNumberOfRows();
int rowindex = 0;
int columnindex = 0;
if (sheetNum == 0) {
for (rowindex = 1; rowindex < rows; rowindex++) {
sheet = workbook.getSheetAt(0);
XSSFRow row = sheet.getRow(rowindex);
if (row != null) {
int cells = row.getPhysicalNumberOfCells();
for (columnindex = 0; columnindex <= cells; columnindex++) {
XSSFCell cell = row.getCell(columnindex);
String value = "";
if (cell == null) {
continue;
} else {
switch (cell.getCellType()) {
case FORMULA:
value = cell.getCellFormula();
break;
case NUMERIC:
//value = (int)cell.getNumericCellValue() + "";
double cellValue = cell.getNumericCellValue();
if (cellValue == Math.rint(cellValue)) {
value = String.valueOf((int) cellValue);
} else {
value = String.valueOf(cellValue);
}
break;
case STRING:
value = cell.getStringCellValue() + "";
break;
case BLANK:
value = null;
// value = cell.getBooleanCellValue() + "";
break;
case ERROR:
value = cell.getErrorCellValue() + "";
break;
default:
}
if (columnindex == 0) {
attach.setSn(Integer.parseInt(value));
}else if (columnindex == 1) {
attach.setYear(Integer.parseInt(value));
}else if (columnindex == 2) {
attach.setSigngu(value);
} else if (columnindex == 3) {
attach.setJan(Integer.parseInt(value));
} else if (columnindex == 4) {
attach.setFeb(Integer.parseInt(value));
} else if (columnindex == 5) {
attach.setMar(Integer.parseInt(value));
} else if (columnindex == 6) {
attach.setApr(Integer.parseInt(value));
} else if (columnindex == 7) {
attach.setMay(Integer.parseInt(value));
} else if (columnindex == 8) {
attach.setJne(Integer.parseInt(value));
} else if (columnindex == 9) {
attach.setJly(Integer.parseInt(value));
} else if (columnindex == 10) {
attach.setAug(Integer.parseInt(value));
} else if (columnindex == 11) {
attach.setSep(Integer.parseInt(value));
} else if (columnindex == 12) {
attach.setOct(Integer.parseInt(value));
} else if (columnindex == 13) {
attach.setNov(Integer.parseInt(value));
} else if (columnindex == 14) {
if ("false".equals(value) || "".equals(value) || "0".equals(value) || value == null ) {
attach.setDec(Integer.parseInt(""));
} else {
attach.setDec(Integer.parseInt(value));
}
}
}
}
actResult = attachFileService.fileInsertActForExcel14(attach);
}
}
}
}
if (actResult > 0) {
out.println("<script>");
out.println("alert('등록에 성공 하였습니다.');");
out.println("location.replace('" + request.getContextPath() + "attachFile.do');");
out.println("</script>");
out.flush();
out.close();
return null;
} else {
out.println("<script>");
out.println("alert('등록 중 오류가 발생했습니다.');");
out.println("location.replace('" + request.getContextPath() + "attachFile.do');");
out.println("</script>");
out.flush();
out.close();
return null;
}
}
I don't really know why empty cell is filled..

Answer 1

I don't think it's a problem with poi. Also check the db insert code.
And I'm developing a library that might be helpful, so I'd appreciate it if you could watch it.
https://github.com/scndry/jackson-dataformat-spreadsheet