java web Excel下载导出功能

给页面添加Excel导出功能：

public void setResponse(HttpServletResponse response, HSSFWorkbook workbook, String excelName){
    try {
        if (response != null) {
            response.setContentType("application/vnd.ms-excel;charset=utf-8");
            response.setHeader("Content-Disposition", "attachment;filename=\"" + new String((excelName + 
　　　　　　　　　".xls").getBytes("gb2312"), "ISO8859-1"));
            OutputStream out = response.getOutputStream();
            workbook.write(out);
            out.close();
        }
    }catch (IOException e){
        e.printStackTrace();
    }
}