public void actionPerformed(ActionEvent e) {
		btn_convert.setEnabled(false);
		new ConvtSwingWorker().execute();
	}

	private class ConvtSwingWorker extends SwingWorker<Void, Void> {
		@Override
		protected Void doInBackground() throws Exception {
			StringWriter sw = new StringWriter();
			PrintWriter pw = new PrintWriter(sw);
			log.append("begin to convert ..." + TLSwing.newline);
			if (txt_source.getText().equals("")) {
				log.append("please input source file...");
			} else {
				log.append("begin to convert ..." + txt_source.getText() + TLSwing.newline);
				file_source = new File(txt_source.getText());
				try {
					in = new FileInputStream(file_source);
					if (file_source.getName().endsWith("xlsx")) {
						workbook = new XSSFWorkbook(in);
						XSSFSheet sheet = workbook.getSheetAt(0);
						Sheet sheet2 = workbook.getSheetAt(0);
						for (Row row : sheet2) {
							if (row.getRowNum() != 0) {
								for (Cell cell : row) {
									// log.append(getCellValue(sheet.getRow(2).getCell(2)));
									log.append(getCellValue((XSSFCell) cell) + TLSwing.newline);
									try {
										Thread.currentThread().sleep(100);
									} catch (InterruptedException e4) {
										// TODO Auto-generated catch
										// block
										e4.printStackTrace(pw);
										log.append("InterruptedException" + TLSwing.newline + sw.toString()
												+ TLSwing.newline);
									}
								}
							}

						}

					} else {

					}
				} catch (IOException e1) {
					e1.printStackTrace(pw);
					log.append("IOException" + TLSwing.newline + sw.toString() + TLSwing.newline);
				} finally {
					if (in != null) {
						try {
							in.close();
						} catch (IOException e2) {
							e2.printStackTrace(pw);
							log.append("IOException" + TLSwing.newline + sw.toString() + TLSwing.newline);
						}
					}
				}
			}
			return null;
		}

		@Override
		protected void done() {
			btn_convert.setEnabled(true);
		}
	}