web development helpdesk

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();
}

written by objects \\ tags: Cell, CellReference, Excel, HSSF, HSSFWorkbook, POI, row, Workbook, WorkbookFactory, XSSF, XSSFWorkbook

In previous posts we have covered opening Excel files, and accessing sheets. Now we need to move onto reading the rows and cells in that sheet.

FileInputStream in = new FileInputStream(file);
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) {
			
			// Do what you want with the cell value
		}
	}
}

written by objects \\ tags: Cell, POI, row, Sheet, WorkbookFactory, Worksheet

The JTable class has a method setRowSelectionAllowed() that allows enabling and disabling of row selection.


table.setRowSelectionAllowed(false);


written by objects \\ tags: JTable, row, selection