jxl操作excel

@RequestMapping(value = "/excel/export")
    public void exportExcel(HttpServletResponse response) {
        try {
            String filename ="应急多发线路统计";
            OutputStream os = response.getOutputStream();// 取得输出流
            response.reset();// 清空输出流
            response.setCharacterEncoding("utf-8");
            // 取得文件名。
            response.setContentType("application/x-msdownload");
            response.setHeader("Content-Disposition", "attachment;filename= "+new String(filename.getBytes("gb2312"),"iso8859-1")+".xls");
            WritableWorkbook book = Workbook.createWorkbook(os);
            // 生成名为“第一页”的工作表，参数0表示这是第一页
            WritableSheet sheet = null;
            emmOftenRoadService.creteEcxel(sheet,book);
            book.write();
            book.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }