I have excel file with such contents:
A1: SomeString
A2: 2
All fields are set to String format.
When I read the file in java using POI, it tells that A2 is in numeric cell format.
.toString().What can I do to read the value as string?
I don't think we had this class back when you asked the question, but today there is an easy answer.
What you want to do is use the DataFormatter class. You pass this a cell, and it does its best to return you a string containing what Excel would show you for that cell. If you pass it a string cell, you'll get the string back. If you pass it a numeric cell with formatting rules applied, it will format the number based on them and give you the string back.
For your case, I'd assume that the numeric cells have an integer formatting rule applied to them. If you ask DataFormatter to format those cells, it'll give you back a string with the integer string in it.
Also, note that lots of people suggest doing cell.setCellType(Cell.CELL_TYPE_STRING), but the Apache POI JavaDocs quite clearly state that you shouldn't do this! Doing the setCellType call will loose formatting, as the javadocs explain the only way to convert to a String with formatting remaining is to use the DataFormatter class.
The below code worked for me for any type of cell.
InputStream inp =getClass().getResourceAsStream("filename.xls"));
Workbook wb = WorkbookFactory.create(inp);
DataFormatter objDefaultFormat = new DataFormatter();
FormulaEvaluator objFormulaEvaluator = new HSSFFormulaEvaluator((HSSFWorkbook) wb);
Sheet sheet= wb.getSheetAt(0);
Iterator<Row> objIterator = sheet.rowIterator();
while(objIterator.hasNext()){
Row row = objIterator.next();
Cell cellValue = row.getCell(0);
objFormulaEvaluator.evaluate(cellValue); // This will evaluate the cell, And any type of cell will return string value
String cellValueStr = objDefaultFormat.formatCellValue(cellValue,objFormulaEvaluator);
}
I would recommend the following approach when modifying cell's type is undesirable:
if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
String str = NumberToTextConverter.toText(cell.getNumericCellValue())
}
NumberToTextConverter can correctly convert double value to a text using Excel's rules without precision loss.
As already mentioned in the Poi's JavaDocs (https://poi.apache.org/apidocs/org/apache/poi/ss/usermodel/Cell.html#setCellType%28int%29) don't use:
cell.setCellType(Cell.CELL_TYPE_STRING);
but use:
DataFormatter df = new DataFormatter();
String value = df.formatCellValue(cell);
More examples on http://massapi.com/class/da/DataFormatter.html
As long as the cell is in text format before the user types in the number, POI will allow you to obtain the value as a string. One key is that if there is a small green triangle in the upper left-hand corner of cell that is formatted as Text, you will be able to retrieve its value as a string (the green triangle appears whenever something that appears to be a number is coerced into a text format). If you have Text formatted cells that contain numbers, but POI will not let you fetch those values as strings, there are a few things you can do to the Spreadsheet data to allow that:
One final thing that you can do is that if you are using POI to obtain data from an Excel 2007 spreadsheet, you can the Cell class 'getRawValue()' method. This does not care what the format is. It will simply return a string with the raw data.
When we read the MS Excel's numeric cell value using Apache POI library, it read it as numeric. But sometime we want it to read as string (e.g. phone numbers, etc.). This is how I did it:
Insert a new column with first cell =CONCATENATE("!",D2). I assume D2 is cell id of your phone-number column. Drag new cell up to end.
Now if you read the cell using POI, it will read the formula instead of calculated value. Now do following:
Add another column
Select complete column created in step 1. and choose Edit->COPY
Go to top cell of column created in step 3. and Select Edit->Paste Special
In the opened window, Select "Values" radio button
Select "OK"
Now read using POI API ... after reading in Java ... just remove the first character i.e. "!"
I also have had a similar issue on a data set of thousands of numbers and I think that I have found a simple way to solve. I needed to get the apostrophe inserted before a number so that a separate DB import always sees the numbers as text. Before this the number 8 would be imported as 8.0.
Solution:
Hey Presto all the numbers but stored as Text.
Many of these answers reference old POI documentation and classes. In the newest POI 3.16, Cell with the int types has been deprecated
Cell.CELL_TYPE_STRING
Instead the CellType enum can be used.
CellType.STRING
Just be sure to update your pom with the poi dependency as well as the poi-ooxml dependency to the new 3.16 version otherwise you will continue to get exceptions. One advantage with this version is that you can specify the cell type at the time the cell is created eliminating all the extra steps described in previous answers:
titleRowCell = currentReportRow.createCell(currentReportColumnIndex, CellType.STRING);
I would much rather go the route of the wil's answer or Vinayak Dornala, unfortunately they effected my performance far to much. I went for a HACKY solution of implicit casting:
for (Row row : sheet){
String strValue = (row.getCell(numericColumn)+""); // hack
...
I don't suggest you do this, for my situation it worked because of the nature of how the system worked and I had a reliable file source.
Footnote: numericColumn Is an int which is generated from reading the header of the file processed.
public class Excellib {
public String getExceldata(String sheetname,int rownum,int cellnum, boolean isString) {
String retVal=null;
try {
FileInputStream fis=new FileInputStream("E:\\Sample-Automation-Workspace\\SampleTestDataDriven\\Registration.xlsx");
Workbook wb=WorkbookFactory.create(fis);
Sheet s=wb.getSheet(sheetname);
Row r=s.getRow(rownum);
Cell c=r.getCell(cellnum);
if(c.getCellType() == Cell.CELL_TYPE_STRING)
retVal=c.getStringCellValue();
else {
retVal = String.valueOf(c.getNumericCellValue());
}
I Tried This and It worked For me
There is a ready-to-use wrapper (some additional optimizations can be applied)
it supports numeric and String cells
formulas are recognized and handled automatically
avoid some boilerplate
public final class Cell {
private final static DataFormatter FORMATTER = new DataFormatter();
private XSSFCell mCell;
public Cell(@NotNull XSSFCell cell) {
mCell = cell;
if (isFormula()) {
XSSFWorkbook book = mCell.getSheet().getWorkbook();
FormulaEvaluator evaluator = book.getCreationHelper().createFormulaEvaluator();
mCell = (XSSFCell) evaluator.evaluateInCell(mCell);
}
}
/**
* Get content
*/
public final int getInt() {
return (int) getLong();
}
public final long getLong() {
return Math.round(getDouble());
}
public final double getDouble() {
return mCell.getNumericCellValue();
}
public final String getString() {
if (!isString()) {
return FORMATTER.formatCellValue(mCell);
}
return mCell.getStringCellValue();
}
/**
* Get properties
*/
public final boolean isNumber() {
if (isFormula()) {
return mCell.getCachedFormulaResultType().equals(CellType.NUMERIC);
}
return mCell.getCellType().equals(CellType.NUMERIC);
}
public final boolean isString() {
if (isFormula()) {
return mCell.getCachedFormulaResultType().equals(CellType.STRING);
}
return mCell.getCellType().equals(CellType.STRING);
}
public final boolean isFormula() {
return mCell.getCellType().equals(CellType.FORMULA);
}
/**
* Debug info
*/
@Override
public String toString() {
return getString();
}
}
It looks like this can't be done in the current version of POI, based on the fact that this bug:
https://issues.apache.org/bugzilla/show_bug.cgi?id=46136
is still outstanding.
We had the same problem and forced our users to format the cells as 'text' before entering the value. That way Excel correctly stores even numbers as text. If the format is changed afterwards Excel only changes the way the value is displayed but does not change the way the value is stored unless the value is entered again (e.g. by pressing return when in the cell).
Whether or not Excel correctly stored the value as text is indicated by the little green triangle that Excel displays in the left upper corner of the cell if it thinks the cell contains a number but is formated as text.
