通过路径下载文件并重新上传

今天有一个需求，给一个pdf的url，然后下载下来请求令一个服务得到新路径。

代码如下：

第一步 下载文件

        String urlStr = "https://***pdf";
        URL url = new URL(urlStr);
        HttpURLConnection conn = (HttpURLConnection)url.openConnection();
        //设置超时间为3秒
        conn.setConnectTimeout(5*1000);
        //防止屏蔽程序抓取而返回403错误
        conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
        //得到输入流
        InputStream inputStream = conn.getInputStream();

第二步 转换成MultipartFile

        MultipartFile multipartFile = new MockMultipartFile("leaseFile", inputStream);

第三步 发送上传文件的请求

        HashMap header = new HashMap<>();
        header.put("Authorization","token");
        HttpUtil.postFile(controllerPath,multipartFile,header,"xxx.pdf");

postFile 工具类

    public static void postFile(String url, MultipartFile excelFile, HashMap headers, String fileName) {

        CloseableHttpClient httpClient = HttpClients.createDefault();

        try {
            //System.out.println("--->"+excelFile.getOriginalFilename());
            HttpPost httpPost = new HttpPost(url);
            MultipartEntityBuilder builder = MultipartEntityBuilder.create();
            builder.addBinaryBody("leaseFile", excelFile.getInputStream(), ContentType.MULTIPART_FORM_DATA, fileName);// 文件流
            builder.addTextBody("filename", fileName);// 类似浏览器表单提交，对应input的name和value
            HttpEntity entity = builder.build();
            httpPost.setEntity(entity);
            Set> headerSet = headers.entrySet();
            for (Map.Entry headerEntry : headerSet) {
                String key = headerEntry.getKey();
                String value = headerEntry.getValue();
                httpPost.setHeader(key, value);
            }

            HttpResponse response  = httpClient.execute(httpPost);// 执行提交
            //System.out.println("postFile---response--->"+response);
            int statusCode =0;
            for (int i = 0; i < 3; i++) {
                try {
                    statusCode = response.getStatusLine().getStatusCode();
                    System.out.println("postFile---statusCode---> "+statusCode);
                } catch (Exception e) {
                    e.printStackTrace();
                }

                if (statusCode== HttpStatus.SC_OK) { // 打印服务器返回的状态
                    break;
                } else {

                    Thread.sleep(1000);
                }
            }
            HttpEntity responseEntity = response.getEntity();
            //System.out.println("postFile---responseEntity--->"+responseEntity);
            if (responseEntity != null) {
                // 将响应内容转换为字符串
                String result  = EntityUtils.toString(responseEntity, Charset.forName("UTF-8"));
                System.out.println("postFile---result---> "+result);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

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