将 Java Swing JTable 标头导出​​到 Excel

Question

In my application, I have exported the table content to Excel already, but the result excludes the table header. Wondering how to export JTable to Excel include the table header? I tried couple ways, but still can not see the table header in excel, the following is my code:

    defautTableModel = new DefaultTableModel(null,columnNames){
        @Override
        public boolean isCellEditable(int row, int column) {
            return false;
        }
    };

    // the jTable row are generated dynamically.
    final JTable jTable = new JTable(defautTableModel);

    jTable.setLocation(20,60);
    jTable.setSize(950,450);
    jTable.setRowHeight(25);

    JTableHeader jTableHeader = jTable.getTableHeader();
    jTableHeader.setLocation(20,30);
    jTableHeader.setSize(950,30);
    jTableHeader.setFont(new Font(null, Font.BOLD, 16));
    jTableHeader.setResizingAllowed(true);
    jTableHeader.setReorderingAllowed(true);

    jTable.add(jTableHeader);

    JScrollPane tablePanel = new JScrollPane(jTable);
    tablePanel.setLocation(10,10);
    tablePanel.setSize(960,400);

    // export data to excel method 

    public void exportToExcel(){
    XSSFWorkbook wb = new XSSFWorkbook();
    XSSFSheet sheet = wb.createSheet();
    for (int i = 0; i < defautTableModel.getRowCount(); i++) {
        Row = sheet.createRow(i);
        for (int j = 0; j < defautTableModel.getColumnCount(); j++) {
            Cell = Row.createCell(j);
            try {
                if (defautTableModel.getValueAt(i,j) != null){
                    Cell.setCellValue(defautTableModel.getValueAt(i,j).toString());
                    FileOutputStream fileOut = new FileOutputStream(Constant.Path_TestData_Output);
                    wb.write(fileOut);
                    fileOut.flush();
                    fileOut.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

Answer 1

You are only accessing the data columns and you need to get the header ones first. You can acheive it by different means, either you use the method getColumnName as ThomasEdwin mentioned in his comment or use columnNames variable that you have provided to your model constructor: new DefaultTableModel(null,columnNames)

Hope it helps

Answer 2

Export Java Swing JTable header with JTable index to Excel

 private static void writeToExcell(DefaultTableModel TabR ,TableColumnModel tableM) throws IOException { try { JFileChooser fileChooser = new JFileChooser(); int retval = fileChooser.showSaveDialog(fileChooser); if (retval == JFileChooser.APPROVE_OPTION) { File file = fileChooser.getSelectedFile(); if (file != null) { if (!file.getName().toLowerCase().endsWith(".xls")) { file = new File(file.getParentFile(), file.getName() + ".xls"); @SuppressWarnings("resource") Workbook wb = new HSSFWorkbook(); @SuppressWarnings("unused") CreationHelper createhelper = wb.getCreationHelper(); org.apache.poi.ss.usermodel.Sheet sheet = wb.createSheet(); org.apache.poi.ss.usermodel.Row row = null; org.apache.poi.ss.usermodel.Cell cell = null; for (int a=0;a<TabR.getRowCount();a++) { row = sheet.createRow(a+1); /* We create an Excel layer Row. We understand how many rows are in TabR with GetRowCount from TabR, the DefaultTableModel of the current JTable, and add one to it.*/ for (int b=0;b<tableM.getColumnCount();b++) { cell = row.createCell(b);/* With the GetColumnCount function of the existing JTable's TableColumnModel, we create more Column in the JTable.*/ cell.setCellValue(TabR.getValueAt(a, b).toString()); /*we give the value of the cell. */ } } for (int c=0;c<cell.getRowIndex();c++) { row = sheet.createRow(c); for (int d=0;d<tableM.getColumnCount();d++) { cell = row.createCell(d); cell.setCellValue(tableM.getColumn(d).getHeaderValue().toString()); } } FileOutputStream out = new FileOutputStream(file); wb.write(out); out.close(); } } } } catch (FileNotFoundException ex) { Logger.getLogger(B_anaEk.class.getName()).log(Level.ALL, null, ex); } catch (IOException ex) { Logger.getLogger(B_anaEk.class.getName()).log(Level.ALL, null, ex); }