jxl操作excel写入数据不覆盖原有数据示例

需要导入的包：jxl.jar

public void readto() {
        workbook wb = null;
        writableworkbook wwb = null;
        try {
            file is = new file(system.getproperty("user.dir") + "\\in.xls");
            file os = new file(system.getproperty("user.dir") + "\\out.xls");
            if (!os.isfile())// 如果指定文件不存在，则新建该文件
                os.createnewfile();

            wb = workbook.getworkbook(is);// 获取数据源in.xls工作簿对象
            wwb = workbook.createworkbook(os, wb);// 在原有工作簿out.xls上追加数据
            // wwb = workbook.createworkbook(os);//区别于上一行代码，创建一个新的写入工作簿
            if (wb != null && wwb != null) {

                writablesheet sheet = wwb.getsheet(0);// 获取out.xls第一个sheet
                writablecell cell = sheet.getwritablecell(2, 4);// 获取out.xls要写入数据的单元格

                sheet[] sheets = wb.getsheets();// 获取数据源in.xls的sheets
                cell[] cells = sheets[0].getrow(1);// 获取in.xls第一个sheet的第二行
                if (cell.gettype() == celltype.label) {
                    label l = (label) cell;
                    l.setstring(cells[1].getcontents());// 将第二个单元格写入out.xls的第三列第五行
                }
                wwb.write();
                system.out.println("工作簿写入数据成功！");
            }
            wwb.close();// 关闭
        } catch (exception e) {
            e.printstacktrace();
        } finally {
            wb.close();
        }
    }