Spring导出txt文件

Controller.java

    /**     * 导出电话号码     * @return     */    @RequestMapping(value = "/export-phones", method = RequestMethod.GET)    public Result exportPhones(@RequestParam(required=false)String uuid, HttpServletResponse response) throws BusinessException {        service.exportPhones(uuid, response);        return success();    }

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Service.java

/**     * 导出电话号码     * @throws BusinessException      */    @SuppressWarnings("unchecked")    @Override    public void exportPhones(String uuid, HttpServletResponse response) throws BusinessException {        if (StringUtils.isBlank(uuid)) {            throw new InvalidArgumentException("uuid=" + uuid);        }        User record = userDao.getByUuid(uuid);        if (record == null) {            throw new BusinessException(ResultCode.RECORD_NOT_EXIST_ERROR.code(),                    ResultCode.RECORD_NOT_EXIST_ERROR.message());        }        String phones = record.getPhones();        //[13628045433, 12345678900] 数据库存的String        List<Long> phoneList = JSONObject.parseObject(phones, ArrayList.class);//下面读取的时候会报错Long转换String        // 导出文件        response.setContentType("text/plain");        String fileName = "phone-list";        response.setHeader("Content-Disposition", "attachment; filename=" + fileName + ".txt");        BufferedOutputStream buff = null;        StringBuffer write = new StringBuffer();        String enter = "\r\n";        ServletOutputStream outSTr = null;        try {               outSTr = response.getOutputStream(); // 建立            buff = new BufferedOutputStream(outSTr);            // 把内容写入文件            if (phoneList.size() > 0) {                for (int i = 0; i < phoneList.size(); i++) {                    write.append(phoneList.get(i));                     write.append(enter);                }            }            buff.write(write.toString().getBytes("UTF-8"));            buff.flush();            buff.close();        } catch (Exception e) {            e.printStackTrace();        } finally {            try {                buff.close();                outSTr.close();            } catch (Exception e) {                e.printStackTrace();            }        }    }