Questions:
Hi Everyone I’m beginner in Java Spring Boot.I want to read the data from excel.Data contains both text and image.I have read text from excel and insert into db successfully.But I could not read the image and I have to insert the image into db.I have attached the error below Can anyone give me a solution? Any help would be appreciate.Thanks in advance….
Image :
@RequestMapping("uploadQuestion")
public String uploadQuestion(@RequestParam("file") MultipartFile file, @RequestParam Long examId, Model model,
HttpSession session) throws IOException, InvalidFormatException {
int flag = 0;
String id = (String) session.getAttribute("userId");
model.addAttribute("examList", onlineExamMasterRepository.findAll());
DataFormatter formatter = new DataFormatter();
List<OnlineExamQuestionMaster> quetions = new ArrayList<OnlineExamQuestionMaster>();
List<OnlineExamOptionMaster> options = new ArrayList<OnlineExamOptionMaster>();
if (file.isEmpty()) {
model.addAttribute("info", "Please select a file to upload");
return "onlinexam/questionUpload :: section";
}
InputStream in = file.getInputStream();
XSSFWorkbook workbook = new XSSFWorkbook(in);
XSSFSheet sheet = workbook.getSheetAt(0);
Row row;
System.out.println(sheet.getLastRowNum());
for (int i = 1; i <= sheet.getLastRowNum(); i++) {
OnlineExamQuestionMaster qm = new OnlineExamQuestionMaster();
OnlineExamQuestionMasterPK qmp = new OnlineExamQuestionMasterPK();
OnlineExamOptionMasterPK omp[] = new OnlineExamOptionMasterPK[4];
OnlineExamOptionMaster om[] = new OnlineExamOptionMaster[4];
qmp.setExamId(examId);
qm.setLogTimestamp(new Date());
qm.setLogUserid(id);
flag++;
row = (Row) sheet.getRow(i);
System.out.println(row.getCell(0).toString());
if (row.getCell(0).toString().equals(null)) {
model.addAttribute("info", "Some columns are null please check and try");
return "onlinexam/questionUpload :: section";
} else {
qmp.setQuestionId(Long.parseLong(formatter.formatCellValue(row.getCell(0))));
if (onlineExamQuestionMasterRepository.exists(qmp)) {
model.addAttribute("message", "Already QuestionId with " + formatter.formatCellValue(row.getCell(0))
+ " Exist for ExamId " + examId);
return "onlinexam/questionUpload :: section";
}
}
if (row.getCell(1).toString().equals("")) {
model.addAttribute("info", "Some columns are null please check and try");
return "onlinexam/questionUpload :: section";
} else
{
row = (Row) sheet.getRow(i);
Iterator<Cell> iterator2 = row.cellIterator();
/*XSSFWorkbook workbook2 = sheet.getWorkbook();
List<XSSFPictureData> pictures = workbook2.getAllPictures();
Iterator<XSSFPictureData> iterator = pictures.iterator();*/
while(iterator2.hasNext())
{
PictureData pictureData = (PictureData)iterator2.next();
String fileextension = pictureData.suggestFileExtension();
byte[] data = pictureData.getData();
if(fileextension.equals("jpeg"))
{
qm.setImage(data);;
}
else
qm.setQidDescription(row.getCell(1).toString().trim());
}
}
if (row.getCell(2).toString().equals("")) {
model.addAttribute("info", "Some columns are null please check and try");
return "onlinexam/questionUpload :: section";
} else {
omp[0] = new OnlineExamOptionMasterPK();
om[0] = new OnlineExamOptionMaster();
omp[0].setQid(Long.parseLong(formatter.formatCellValue(row.getCell(0))));
omp[0].setOptionId("A");
omp[0].setExamId(examId);
om[0].setLogTimestamp(new Date());
om[0].setLogUserid(id);
om[0].setOptionDesc(row.getCell(2).toString().trim());
om[0].setId(omp[0]);
}
if (row.getCell(3).toString().equals("")) {
model.addAttribute("info", "Some columns are null please check and try");
return "onlinexam/questionUpload :: section";
} else {
omp[1] = new OnlineExamOptionMasterPK();
om[1] = new OnlineExamOptionMaster();
omp[1].setExamId(examId);
omp[1].setQid(Long.parseLong(formatter.formatCellValue(row.getCell(0))));
omp[1].setOptionId("B");
om[0].setLogTimestamp(new Date());
om[0].setLogUserid(id);
om[1].setOptionDesc(row.getCell(3).toString().trim());
om[1].setId(omp[1]);
}
if (row.getCell(4).toString().equals("")) {
model.addAttribute("info", "Some columns are null please check and try");
return "onlinexam/questionUpload :: section";
} else {
omp[2] = new OnlineExamOptionMasterPK();
om[2] = new OnlineExamOptionMaster();
omp[2].setExamId(examId);
omp[2].setQid(Long.parseLong(formatter.formatCellValue(row.getCell(0))));
omp[2].setOptionId("C");
om[0].setLogTimestamp(new Date());
om[0].setLogUserid(id);
om[2].setOptionDesc(row.getCell(4).toString().trim());
om[2].setId(omp[2]);
}
if (row.getCell(5).toString().equals("")) {
model.addAttribute("info", "Some columns are null please check and try");
return "onlinexam/questionUpload :: section";
} else {
omp[3] = new OnlineExamOptionMasterPK();
om[3] = new OnlineExamOptionMaster();
omp[3].setExamId(examId);
omp[3].setQid(Long.parseLong(formatter.formatCellValue(row.getCell(0))));
omp[3].setOptionId("D");
om[0].setLogTimestamp(new Date());
om[0].setLogUserid(id);
om[3].setOptionDesc(row.getCell(5).toString().trim());
om[3].setId(omp[3]);
}
if (row.getCell(6).toString().equals("")) {
model.addAttribute("info", "Some columns are null please check and try");
return "onlinexam/questionUpload :: section";
} else {
qm.setAnswer(row.getCell(6).toString().toUpperCase().trim());
}
if (row.getCell(7).toString().equals("")) {
model.addAttribute("info", "Some columns are null please check and try");
return "onlinexam/questionUpload :: section";
} else {
qm.setMarks(Long.parseLong(formatter.formatCellValue(row.getCell(7))));
}
qm.setId(qmp);
quetions.add(qm);
options.addAll(Arrays.asList(om));
}
for (OnlineExamQuestionMaster h : quetions) {
onlineExamQuestionMasterRepository.save(h);
}
System.out.println(options.size());
for (OnlineExamOptionMaster h : options) {
System.out.println(h.toString());
onlineExamOptionMasterRepository.save(h);
}
model.addAttribute("info", flag + "Questions Uploaded Sucessfully");
return "onlinexam/questionUpload :: section";
}
How to&Answers:
Pictures are not cell content in Excel. They hover in a separate drawing layer (XSSFDrawing in case of XSSF) over the sheet and are anchored to cells.
So if the need is getting pictures according to the position they are anchored to, then we need to
- get the drawing layer
- loop over all shapes in that layer and if the shape is a picture, then
- get the picture
- get the anchor position of that picture
Following example is doing that and produces a Map which maps XSSFPicture to their positions. I have got the XSSFPicture because they provide much more information than the XSSFPictureData alone. And the XSSFPictureData can easily got form the XSSFPicture.
import java.io.FileInputStream;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.*;
import java.util.Map;
import java.util.HashMap;
public class ExcelGetPicturesWithPosition {
static Map<String, XSSFPicture> getPicturesWithPosition(XSSFSheet sheet) {
Map<String, XSSFPicture> pictures = new HashMap<String, XSSFPicture>();
XSSFDrawing drawing = sheet.getDrawingPatriarch();
for (XSSFShape shape : drawing.getShapes()) {
if (shape instanceof XSSFPicture) {
XSSFPicture picture = (XSSFPicture)shape;
XSSFClientAnchor anchor = picture.getClientAnchor();
String cellAddr = "R" + anchor.getRow1() + "C" + anchor.getCol1();
pictures.put(cellAddr, picture);
}
}
return pictures;
}
public static void main(String[] args) throws Exception {
XSSFWorkbook workbook = (XSSFWorkbook)WorkbookFactory.create(new FileInputStream("ExcelWithPictures.xlsx"));
XSSFSheet sheet = workbook.getSheetAt(0);
Map<String, XSSFPicture> pictures = getPicturesWithPosition(sheet);
System.out.println(pictures);
workbook.close();
}
}
Once having that Map it is easy to get the pictures while iterating the sheet. For example if we are on int row = 2; int column = 1;:
XSSFPicture picture = pictures.get("R"+row+"C"+column);
