java操作excel,用的jxl,帮忙看看
public void Update() { boolean isChecked = false; int x, y; String id = null; String number = null; try { // Excel获得文件 // Excel获得文件 Workbook wb = Workbook.getWorkbook(new File("T.xls")); // 打开一个文件的副本，并且指定数据写回到原文件 WritableWorkbook book = Workbook.createWorkbook(new File("T.xls"), wb); // 添加一个工作表 // WritableSheet sheet = book.createSheet("第二页", 1); WritableSheet sheet = book.getSheet(0); // 得到当前工作表的列数 int colNum = sheet.getColumns(); for (int j = 0; j < colNum; j++) { // 得到当前列的所有单元格 Cell[] cells = sheet.getColumn(j); if (cells.length > 1) { isChecked = true; continue; } else { flag = true;// while (flag) { id = getId(); number = this.getNumber(id); // 对每个单元格进行循环 for (int k = 1; k < cells.length - 1; k++) { System.out.println(id); // 读取当前单元格的值 String cellValue = cells[k].getContents(); if ((cellValue == null || cellValue .equals("")) && cellValue.equals(number)) { Label lc = new Label(k, j, "Checked-in"); sheet.addCell(lc); book.write(); System.out.println("添加成功"); // k = cells.length; } } } } }book.close(); } catch (Exception e) { flag = false; System.out.println(e); } }