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Populated int as float value after xlsx to csv converstion in java

Trying to convert xlsx file to csv, where after conversation the integer value has been converted to float in output file. But other string values are resulted as expected.
Below is the example
source record
converted record
code:
Workbook workbook = null;
String ext = FilenameUtils.getExtension(inputFile.toString());
workbook = new XSSFWorkbook(fis);
int numberOfSheets = workbook.getNumberOfSheets();
Row row;
Cell cell;
// Iterate through each rows from first sheet
for (int i = 0; i < numberOfSheets; i++) {
Sheet sheet = workbook.getSheetAt(0);
Iterator<Row> rowIterator = sheet.iterator();
while (rowIterator.hasNext()) {
row = rowIterator.next();
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext()) {
cell = cellIterator.next();
CellType type = cell.getCellType();
switch (type) {
case BOOLEAN:
data.append(cell.getBooleanCellValue() + ",");
break;
case NUMERIC:
data.append(cell.getNumericCellValue() + ",");
break;
case STRING:
data.append(cell.getStringCellValue() + ",");
break;
case BLANK:
data.append("" + ",");
break;
default:
data.append(cell + ",");
}
}
data.append('\n');
}
}
fos.write(data.toString().getBytes());
fos.close();

Write contents of excel into a text file

I need to read the contents of an excel file and dump the same into a text file. I am able to read the contents from the file.
I created a List excelData = new ArrayList(); which should hold the row data present in the excel sheet. But each column is of a different data type. How do I save the contents into the List ?
List excelData = new ArrayList();
try {
FileInputStream file = new FileInputStream(new File("H:\\Docs\\Medical Data Record\\MedicalRecord2015.xlsx"));
XSSFWorkbook wb = new XSSFWorkbook(file);
XSSFSheet ws = wb.getSheetAt(0);
Iterator<Row> itr = ws.iterator();
while (itr.hasNext()) {
Row row = itr.next();
Iterator<Cell> itrCell = row.cellIterator();
while (itrCell.hasNext()) {
Cell cell = itrCell.next();
switch (cell.getCellType()) {
case Cell.CELL_TYPE_NUMERIC:
double val = cell.getNumericCellValue();
break;
case Cell.CELL_TYPE_STRING:
String txtval = cell.getStringCellValue();
break;
}
}
}
Thanks

Seems you need not List, but List<List<Object>> here:
List<List<Object>> excelData = new ArrayList<>();
try {
//...
while (itr.hasNext()) {
Row row = itr.next();
List<Object> dataRow = new ArrayList<>();
excelData.add(dataRow);
Iterator<Cell> itrCell = row.cellIterator();
while (itrCell.hasNext()) {
Cell cell = itrCell.next();
if (cell == null) {
dataRow.add(null);
continue;
}
switch (cell.getCellType()) {
case Cell.CELL_TYPE_NUMERIC:
dataRow.add(cell.getNumericCellValue());
break;
case Cell.CELL_TYPE_STRING:
dataRow.add(cell.getStringCellValue());
break;
case Cell.CELL_TYPE_BOOLEAN:
dataRow.add(cell.getBooleanCellValue());
break;
case Cell.CELL_TYPE_BLANK:
dataRow.add("");
break;
default:
dataRow.add(cell);
}
}
}
Now, excelData contains List of rows represented as List<Object>, and can be easily saved to text file row by row. To achieve better consistency, you need also check another types of cell, like Cell.CELL_TYPE_BOOLEAN or null.

Read integer from numeric cell using Apache POI in java

I have an application which reads xls sheet using apache poi. When the cell has numeric value, i read it by row.getCell(i).getNumericValue(). But it returns floating point digit. like if the cell value is 1, it returns 1.0. Can i convert it to int ? Any helpwould be appreciated. I tried Integer.parseInt(value)- but it throws NumberFormat exception.Any help is appreciated.Here is the pseudo code:
FileInputStream file = new FileInputStream(new File("C:\\test.xls"));
HSSFWorkbook workbook = new HSSFWorkbook(file);
HSSFSheet sheet = workbook.getSheetAt(0);
Iterator<Row> rowIterator = sheet.iterator();
while(rowIterator.hasNext()) {
Row row = rowIterator.next();
Iterator<Cell> cellIterator = row.cellIterator();
while(cellIterator.hasNext()) {
Cell cell = cellIterator.next();
switch(cell.getCellType()) {
case Cell.CELL_TYPE_NUMERIC:
String value= String.valueOf(cell.getNumericCellValue());
int intVal = Integer.parseInt(value)-->>throws Exception

Numbers in Excel are (except for a few edge cases) stored as floating point numbers. Floating point numbers in Java, when formatted as a string, are printed with a trailing decimal point, as you're seeing
Assuming what you really wanted was "give me a string that looks like what Excel shows for this cell", then do not call cell.toString(). This will not give you what you want in most cases
Instead, you need to use the DataFormatter class, which provides methods which read the Excel format rules applied to a cell, then re-creates (as best it can) those in Java
Your code should be:
Workbook wb = WorkbookFactory.create(new File("c:/test.xls");
DataFormatter fmt = new DataFormatter();
Sheet sheet = wb.getSheetAt(0);
for (Row row : sheet) {
Cell cell = row.getcell(0, Row.RETURN_BLANK_AS_NULL);
if(cell!=null) {
String value = fmt.formatCellValue(cell);
if (! value.trim().isEmpty()) {
System.out.println("Cell as string is " + value);
}
}
}
You may notice I've also fixed a bunch of other stuff as well....!

// to extract the exact numerical value either integer/double
DataFormatter fmt = new DataFormatter();
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext()) {
Cell cell = cellIterator.next();
switch (cell.getCellType()) {
case NUMERIC:
if (DateUtil.isCellDateFormatted(cell)) {
Date date = cell.getDateCellValue();
DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd");
//DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
fetchedRow.add(dateFormat.format(date));
} else {
fetchedRow.add(fmt.formatCellValue(cell));
}
rowEmpty = false;
break;
case STRING:
fetchedRow.add(cell.toString());
rowEmpty = false;
break;
case BOOLEAN:
fetchedRow.add(cell.toString());
rowEmpty = false;
break;
case FORMULA:
fetchedRow.add(Double.toString(cell.getNumericCellValue()));
rowEmpty = false;
break;
case BLANK:
fetchedRow.add("");
break;
}
}
if (!rowEmpty) {
allRows.add(fetchedRow.toArray(new String[0]));
count++;
}
if (count >= limit) {
break;
}
}
return allRows;
}
eaxmple to read limitted no.of rows on and use DataFormatter to give exact numeric value either integer/ double value. This will work.

Someone might find this hack useful:
cell.setCellType(CellType.STRING);
int value = Integer.parseInt(cell.getStringCellValue());
Remember you alter the cell type here, so be sure this does not cause any side effect. In a single-threaded app you can just read the type before and restore it after.

You can read int value as string apache poi using simple steps
First count rows in sheets using below method
private int getRowCount(Sheet currentSheet) {
int rowCount = 0;
Iterator<Row> rowIterator = currentSheet.iterator();
while(rowIterator.hasNext()) {
Row row = rowIterator.next();
if(row == null || row.getCell(0) == null || row.getCell(0).getStringCellValue().trim().equals("") || row.getCell(0).toString().trim().equals("")
|| row.getCell(0).getCellType()==Cell.CELL_TYPE_BLANK){
break;
}
else
rowCount=rowCount + 1;
}
return rowCount;
}
Then use below code in your method
Workbook workbook = WorkbookFactory.create(new File("c:/test.xls");
Sheet marksSheet = (Sheet) workbook.getSheet("Sheet1");
int zoneLastCount = 0;
if(marksSheet !=null ) {
zoneLastCount = getRowCount(marksSheet);
}
int zone = zoneLastCount-1;
int column=1
for(int i = 0; i < zone; i++) {
Row currentrow = marksSheet.getRow(i);
double year = Double.parseDouble(currentrow.getCell(columnno).toString());
int year1 = (int)year;
String str = String.valueOf(year1);
}

You can just type cast float to int like :
String value = String.valueOf((int)cell.getNumericCellValue());

Cell cell = row.getCell(cellCpt);
String cellContent = "";
if (cell != null) {
cell.setCellType(CellType.STRING);
cellContent = fmt.formatCellValue(cell);
}

Try doing the following (to obtain a long):
long value = (long) currentCell.getNumericValue();

Below implementation worked for me:
private Object getValue(Cell cell) {
switch (cell.getCellType()) {
case Cell.CELL_TYPE_STRING:
return cell.getStringCellValue();
case Cell.CELL_TYPE_NUMERIC:
return String.valueOf((int) cell.getNumericCellValue());
case Cell.CELL_TYPE_BOOLEAN:
return cell.getBooleanCellValue();
case Cell.CELL_TYPE_ERROR:
return cell.getErrorCellValue();
case Cell.CELL_TYPE_FORMULA:
return cell.getCellFormula();
case Cell.CELL_TYPE_BLANK:
return null;
}
return null;
}

Passing a list of servlet values

Using apache poi, I am reading the first row values of an excel file like this
try
{
FileInputStream file = new FileInputStream(uploadedFile);
XSSFWorkbook workbook = new XSSFWorkbook(file);
for (int i =0; i < workbook.getNumberOfSheets(); i++)
{
XSSFSheet sheet = workbook.getSheetAt(i);
Iterator<Row> rowIterator = sheet.iterator();
String SheetName = "<span class='blue'><b>" +sheet.getSheetName()+ "<b></span><br>";
request.setAttribute("SheetName", SheetName);
Row row = rowIterator.next();
if(row.getRowNum() == 0)
{
Iterator<Cell> cellIterator = row.cellIterator();
while(cellIterator.hasNext())
{
Cell cell1 = cellIterator.next();
switch(cell1.getCellType())
{
case Cell.CELL_TYPE_STRING:
String strval = cell1.getStringCellValue();
request.setAttribute("Values2", strval);
break;
}
}
}
}
file.close();
}catch(NoSuchElementException e)
{}
Now, I want to pass a list of values the strval is only sending one value, how do I sent many values??
How to send an array of items to my jsp page?

You can send List as an attribute value. For example:
List<String> cellValues = new ArrayList<String>();
while(cellIterator.hasNext())
{
Cell cell1 = cellIterator.next();
switch(cell1.getCellType())
{
case Cell.CELL_TYPE_STRING:
String strval = cell1.getStringCellValue();
cellValues.add(strval);
break;
}
}
}
}
request.settAttribute("Values2", cellValues);

Read xlsRead from java

Need help on,
I have an Excel file
TN FN MN LN Type
MR Test1 t1 Test1 abc
MR Test2 t2 abc
MR t3 Test3 abc
MR Test4 t4 Test4 abc
My requirements are:
read rows from java program
check for invalid rows(if either 2nd or 4th column is null/empty then it will be invalid rows and store this row in list1 )
check for valid rows(if neither 2nd or 4th column is not null/empty then it will be valid rows and store this rows in list2)
1)
FileInputStream file = new FileInputStream("c:\\test.xls");
//Get the workbook instance for XLS file
XSSFWorkbook workbook = new XSSFWorkbook(file);
//Get first sheet from the workbook
XSSFSheet sheet = workbook.getSheetAt(0);
//Iterate through each rows from first sheet
Iterator<Row> rowIterator = sheet.iterator();
while(rowIterator.hasNext()) {
Row row = rowIterator.next();
//For each row, iterate through each columns
Iterator<Cell> cellIterator = row.cellIterator();
while(cellIterator.hasNext()) {
Cell cell = cellIterator.next();
switch(cell.getCellType()) {
case Cell.CELL_TYPE_BOOLEAN:
System.out.print(cell.getBooleanCellValue() + "\t\t");
break;
case Cell.CELL_TYPE_NUMERIC:
System.out.print(cell.getNumericCellValue() + "\t\t");
break;
case Cell.CELL_TYPE_STRING:
System.out.print(cell.getStringCellValue() + "\t\t");
break;
}
}
System.out.println("");
}
file.close();
FileOutputStream out =
new FileOutputStream(new File("C:\\Users\\IBM_ADMIN\\Desktop\\test.xls"));
workbook.write(out);
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
2) I am stuck here, how can I get the valid and invalid rows?
Appreciate your help

POI takes a little getting used to. You have to explicitly check to see if the cell is blank or null.
There's a good example here on SO.