博客

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();
    }

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();
            }
        }
    }