导出报表Content-Disposition

论坛有个需求，导出参加活动的人数情况，用报表来保存，详细代码如下：

@RequestMapping(value = "/activity/export")
    @ResponseBody
    public String export(HttpServletRequest request, HttpServletResponse response) {

        long tid = NumberUtils.toLong(request.getParameter("tid"), 0l);

        Topic topic = topicService.findTopic(tid);

        Activity activity = activityService.findActivity(tid);

        response.reset();//清空缓存
        response.setCharacterEncoding("GBK");
        response.setHeader("Content-Disposition", "attachment; filename=\"" + "activity_"
                + topic.getTid() + ".csv\"");//生成的文件初始文件名称

        //获取报表内容
        StringBuilder sb = activityService.getExportContent(activity, topic);

        OutputStream os = null;
        try {
            os = response.getOutputStream();
            byte[] byt = sb.toString().getBytes();
            os.write(byt);
        } catch (Exception e) {
            log.error("输出活动参与报表失败", e.getStackTrace());
        } finally {
            try {
                os.close();
            } catch (IOException e) {
                log.error("输出活动参与报表关闭输出流失败", e.getStackTrace());
            }
        }

        return null;
    }

 其中activityService.getExportContent(activity, topic)这个方法是报表内容，关键代码如下：

//参与活动用户信息
        boolean username = false, persons = false, phone = false, city = false,
                carNum = false, email = false, postNum = false, address = false, desc = false;
        sb.append("昵称");
        if (Boolean.parseBoolean(appConfigService.getValueByName(SystemConstant.ACTIVITYITEM_CONFIG_SHOW_USERNAME))) {
            sb.append(",");
            sb.append("真实姓名");
            sb.append(",");
            sb.append("用户ID");
            sb.append(",");
            sb.append("用户名");
            username = true;
        }
        if (Boolean.parseBoolean(appConfigService.getValueByName(SystemConstant.ACTIVITYITEM_CONFIG_SHOW_PERSONS))) {
            sb.append(",");
            sb.append("参加人数");
            persons = true;
        }
        if (Boolean.parseBoolean(appConfigService.getValueByName(SystemConstant.ACTIVITYITEM_CONFIG_SHOW_PHONE))) {
            sb.append(",");
            sb.append("联系电话");
            phone = true;
        }
        if (Boolean.parseBoolean(appConfigService.getValueByName(SystemConstant.ACTIVITYITEM_CONFIG_SHOW_CITY))) {
            sb.append(",");
            sb.append("所在城市");
            city = true;
        }
        if (Boolean.parseBoolean(appConfigService.getValueByName(SystemConstant.ACTIVITYITEM_CONFIG_SHOW_CARNUM))) {
            sb.append(",");
            sb.append("车牌号码");
            carNum = true;
        }
        if (Boolean.parseBoolean(appConfigService.getValueByName(SystemConstant.ACTIVITYITEM_CONFIG_SHOW_EMAIL))) {
            sb.append(",");
            sb.append("电子邮件");
            email = true;
        }
        if (Boolean.parseBoolean(appConfigService.getValueByName(SystemConstant.ACTIVITYITEM_CONFIG_SHOW_POSTNUM))) {
            sb.append(",");
            sb.append("邮政编码");
            postNum = true;
        }
        if (Boolean.parseBoolean(appConfigService.getValueByName(SystemConstant.ACTIVITYITEM_CONFIG_SHOW_ADDRESS))) {
            sb.append(",");
            sb.append("联系地址");
            address = true;
        }
        if (Boolean.parseBoolean(appConfigService.getValueByName(SystemConstant.ACTIVITYITEM_CONFIG_SHOW_DESC))) {
            sb.append(",");
            sb.append("特别说明");
            desc = true;
        }
        sb.append(",报名时间,状态");
        sb.append(separator);

        User regUser = null;
        List<ActivityItem> list = activityItemService.queryActivityItem(activity.getTid(), null, true);
        for (ActivityItem item : list) {
            sb.append(item.getAuthor().getNickname()).append(",");
            if (username) {
                sb.append(item.getName()).append(",");
                sb.append(item.getUid()).append(",");
                regUser = userService.findUser(item.getUid());
                if (regUser != null) {
                	sb.append(regUser.getUsername()).append(",");
                } else {
                	sb.append("").append(",");
                }
            }
            if (persons) {
                sb.append(item.getPersons()).append(",");
            }
            if (phone) {
                sb.append("\t" + item.getPhone() + "\t").append(",");
            }
            if (city) {
                sb.append(item.getCity()).append(",");
            }
            if (carNum) {
                sb.append(item.getCarNum()).append(",");
            }
            if (email) {
                sb.append(item.getEmail()).append(",");
            }
            if (postNum) {
                sb.append(item.getPostNum()).append(",");
            }
            if (address) {
                sb.append(item.getAddress()).append(",");
            }
            if (desc) {
                sb.append(item.getDescription().replace("\r","").replace("\n","").replaceAll("\"","”").replaceAll(",", " ")).append(",");
            }
            sb.append(sdf1.format(item.getCreateAt())).append(",")
                .append(item.getStatus() == SystemConstant.ACTIVITY_ITEM_NOT_CENSOR ? "尚未审核"
                        : item.getStatus() == SystemConstant.ACTIVITY_ITEM_CENSOR_PASS ?
                        "审核通过" : "被拒绝").append(separator);

导出的文件内容：

 

关于上面的方法有几个说明：

1.后缀为csv的文件，可以用excel打开，来自百科的解析：逗号分隔值（Comma-Separated Values，CSV，有时也称为字符分隔值，因为分隔字符也可以不是逗号），其文件以纯文本形式存储表格数据（数字和文本）。纯文本意味着该文件是一个字符序列，不含必须像二进制数字那样被解读的数据。CSV文件由任意数目的记录组成，记录间以某种换行符分隔；每条记录由字段组成，字段间的分隔符是其它字符或字符串，最常见的是逗号或制表符。通常，所有记录都有完全相同的字段序列。

2.Content-disposition 是 MIME 协议的扩展，MIME 协议指示 MIME 用户代理如何显示附加的文件。当 Internet Explorer 接收到头时，它会激活文件下载对话框，它的文件名框自动填充了头中指定的文件名。（请注意，这是设计导致的；无法使用此功能将文档保存到用户的计算机上，而不向用户询问保存位置。）