list数据通过流直接保存到oss结果记录_将list数据写入到oss-优快云博客

本文链接：https://blog.youkuaiyun.com/hyperin/article/details/88428460

这篇博客详细介绍了如何将List类型的数据利用流（Stream）直接上传到对象存储服务（OSS）。内容涵盖操作步骤、注意事项以及可能遇到的问题解决方案。

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   /**
     * 获取文件输入流
     * @param list
     * @param sheetName
     * @param <T>
     * @return
     */
 
 private <T> InputStream getFileInputStream( List<T> list, String sheetName) {
        if (list == null || list.isEmpty()) {
            return null;
        }
        Class<?> clazz = list.get(0).getClass();
		//避免乱码问题
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        ExcelUtil excelUtil = new ExcelUtil<>(clazz);
        excelUtil.exportExcel(list, sheetName, out);
        byte[] bytes = out.toByteArray();
        ByteArrayInputStream in = new ByteArrayInputStream(bytes);
        return in;
    }
	
	
	
	 public List<String> UploadFile() {
        String host =192.168.120.1
        //封装后的oass文件上传地址
		//通过http请求了，底层还是ossClient
        String url = host + "/v2.0/upload/file";
        HttpPost post = new HttpPost(url);
        MultipartEntityBuilder EntityBuilder = MultipartEntityBuilder.create();
        //设置字符编码，防止乱码
        ContentType contentType = ContentType.create("text/plain", Charset.forName("UTF-8"));
        try {
			List<String> list=new ArrayList<>;
			String sheetName ="测试excel";
			InputStream in = this.getFileInputStream(list, sheetName);
			//为了兼容性选择xls
			EntityBuilder.addBinaryBody("file", in, ContentType.MULTIPART_FORM_DATA, sheetName + ".xls");
			
			/** 这里上传到oss不能指定文件名，如果需要指定可以使用
             * ObjectMetadata meta = new ObjectMetadata();
             * String filename = file.getOriginalName();
             * meta.setContentDisposition("attachment;filename=\""+filename+"\"");
             */
			 
            post.setEntity(EntityBuilder.build());
            CloseableHttpClient httpClient = HttpClients.createDefault();
            HttpResponse response = httpClient.execute(post);
            HttpEntity entity = response.getEntity();
            String res = EntityUtils.toString(entity, "UTF-8");
            JSONObject jsonObject = JSONObject.fromObject(res);
            JSONArray data = jsonObject.getJSONArray("data");
            List<String> list = new ArrayList<>();
            for (int i = 0; i < data.size(); i++) {
                JSONObject jsonObject1 = data.getJSONObject(i);
                String filename = jsonObject1.getString("filename");
                list.add(filename);
            }
            return list;
        } catch (Exception e) {
            logger.error("上传excel到oss异常", e);
            return null;
        }

    }