Dec 01

The following just puts together everything we’ve covered on POI so far.

The following is a simple utility method to read an Excel file (XLS or XLSX) and write the reference and contents of each cell to a writer of your choice. So you could use it to dump stdout, or a file.

public static void dump(File excel, PrintWriter out) throws IOException, InvalidFormatException {
	FileInputStream in = new FileInputStream(excel);
	Workbook workbook = WorkbookFactory.create(in);

	int nsheets = workbook.getNumberOfSheets();
	for (int i = 0; i < nsheets; i++) {
		Sheet sheet = workbook.getSheetAt(i);
		for (Row row : sheet) {
			for (Cell cell : row) {
				String cellValue = null;

				switch (cell.getCellType()) {
					case Cell.CELL_TYPE_STRING:
						cellValue = cell.getStringCellValue();
						break;

					case Cell.CELL_TYPE_FORMULA:
						cellValue = cell.getCellFormula();
						break;

					case Cell.CELL_TYPE_NUMERIC:
						if (DateUtil.isCellDateFormatted(cell)) {
							cellValue = 
								cell.getDateCellValue().toString();
						} else {
							cellValue = Double.toString(
								cell.getNumericCellValue());
						}
						break;

					case Cell.CELL_TYPE_BLANK:
						cellValue = "";
						break;

					case Cell.CELL_TYPE_BOOLEAN:
						cellValue = Boolean
								.toString(cell.getBooleanCellValue());
						break;
				}
				CellReference cellReference = new CellReference(
						row.getRowNum(), cell.getColumnIndex());
				out.println(cellReference.formatAsString()+"="+cellValue);
			}
		}
	}
	in.close();
}

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Dec 01

If you just need a quick and dirty method to extract the text from an Excel spreadsheet then you can use the ExcelExtractor class included in POI. The following example snippet shows its usage:

FileInputStream in = new FileInputStream(file);
HSSFWorkbook workbook = new HSSFWorkbook(in) :
ExcelExtractor extractor = new ExcelExtractor(workbook);
String text = extractor.getText();

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Nov 23

POI supports the older OLE2 format Excel (XLS) files using HSSF, and using XSSF can also handle the newer OOXML format (XLSX) used by Microsoft Office 2007, 2008 and onwards.

If you want to open an Excel file in either format then you can use something like the following:

FileInputStream in = new FileInputStream(file);
Workbook workbook = WorkbookFactory.create(in);

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