如何利用JAVA获取文件流并转换为文件格式存储-优快云博客

本文链接：https://blog.youkuaiyun.com/javaSYK/article/details/132880553

本文介绍了如何使用Java的CloseableHttpClient库通过HTTP请求从指定URL下载文件，处理文件名和类型，然后将文件添加到MultipartFile列表中，处理可能的IOExceptions。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

String[] split = fileKeys.split(",");
CloseableHttpClient client = HttpClients.createDefault();
List<MultipartFile> fileList = new ArrayList<>();
通过附件id循环获取文件
  for (String fileKey : split) {
       //判断是否为空
        if (StringUtils.isNotBlank(fileKey)){
            //请求路径
            String fileUrl = "http://localhoost:8080/ltcFile/download/"+fileKey;
            CloseableHttpResponse fileResponse = null;
            HttpGet httpGet = new HttpGet(fileUrl);
            // 获取header中文件类型
            String fileName = "";int x=0;
               try {
                    fileResponse = client.execute(httpGet);
                    if (fileResponse.getStatusLine().getStatusCode() == 200) {
                        Header[] headers = fileResponse.getAllHeaders();
                        String value = headers[x].getValue();
                        System.out.println(value);
                        fileName=value;

                        HttpEntity fileEntity = fileResponse.getEntity();
                        InputStream inputStream = fileEntity.getContent();
                        MultipartFile multipartFile = new MockMultipartFile
                                (URLDecoder.decode(fileName, "UTF-8"),URLDecoder.decode(fileName, "UTF-8"),
                                        ContentType.APPLICATION_OCTET_STREAM.toString(),inputStream);
                        fileList.add(multipartFile);
                        logger.info(multipartFile.getOriginalFilename());

                        inputStream.close();
                    }
                } catch (IOException e) {
                    logger.error(e.getMessage());
                }finally {
                    try {
                        fileResponse.close();
                    } catch (IOException e) {
                        logger.error(e.getMessage());
                    }
                }
            }
        }