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java – Import data from JTable to Excel

Posted by: admin May 14, 2020 Leave a comment

Questions:

i have code to import data from JTable to Excel like this:

public void toExcel(JTable table, File file){
try {

        WritableWorkbook workbook1 = Workbook.createWorkbook(file);
        WritableSheet sheet1 = workbook1.createSheet("First Sheet", 0); 
        TableModel model = table.getModel();

        for (int i = 0; i < model.getColumnCount(); i++) {
            Label column = new Label(i, 0, model.getColumnName(i));
            sheet1.addCell(column);
        }
        int j = 0;
        for (int i = 0; i < model.getRowCount(); i++) {
            for (j = 0; j < model.getColumnCount(); j++) {
                Label row = new Label(j, i + 1, 
                        model.getValueAt(i, j).toString());
                sheet1.addCell(row);
            }
        }
        workbook1.write();
        workbook1.close();
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}


void excell(){
          toExcel(TabelPerencanaan, new File("H:\Hasil.xlsx"));
                JOptionPane.showMessageDialog(null, "Data saved at " +
                        "'H: \ Hasil.xlsx' successfully", "Message",
                        JOptionPane.INFORMATION_MESSAGE);

}

But, when open file “Hasil.xlsx” always error. so, that file can’t opened. i don’t know why like that. thanks

How to&Answers:

The problem is that Java Excel API only generates spreadsheets in Excel 2000 format. In that case, you need:

new File("H:\Hasil.xls")

But if you really need to generate a XLSX, you can use Apache POI.

Workbook wb = new XSSFWorkbook();
Sheet sheet = wb.createSheet();
Row row = sheet.createRow(0);
TableModel model = table.getModel();
for (int i = 0; i < model.getColumnCount(); i++) {
    row.createCell(i).setCellValue(model.getColumnName(i));
}
for (int i = 0; i < model.getRowCount(); i++) {
    row = sheet.createRow(i + 1);
    for (int j = 0; j < model.getColumnCount(); j++) {
        row.createCell(j).setCellValue(
            model.getValueAt(i, j).toString()
        );
    }
}
FileOutputStream fileOut = new FileOutputStream("H:\Hasil.xlsx");
wb.write(fileOut);
fileOut.close();