关于调用第三方接口时传递参数是File类型的解决方式

最近在做一个项目，需要频繁的调用第三方的接口，本以为都是基本的数据类型，没想到需要传一个文件类型的参数，我想着调用接口的时候直接用文件流把文件写到connection不就行了，这就是我一开始写的调用工具类

    public static String sendGetFile(String url, MultipartFile file) {
        String result = "";
        BufferedReader in = null;
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

没想到报了文件损坏错误，改方法无用，改用form-data方式来传数据方法如下

  public static String sendGetFile(String url, String filePath) {
        String sResponse="";
        try {
            CloseableHttpClient httpClient = HttpClients.createDefault();
            HttpPost uploadFile = new HttpPost(url);

            MultipartEntityBuilder builder = MultipartEntityBuilder.create();
            File f = new File(filePath);
            // 把文件加到HTTP的post请求中
            builder.addBinaryBody(
                    "code_file",
                    new FileInputStream(f),
                    ContentType.APPLICATION_OCTET_STREAM,
                    f.getName()
            );
            HttpEntity multipart = builder.build();
            uploadFile.setEntity(multipart);
            CloseableHttpResponse response = httpClient.execute(uploadFile);
            HttpEntity responseEntity = response.getEntity();
            sResponse  = EntityUtils.toString(responseEntity, "UTF-8");
        }catch (Exception e){
            e.printStackTrace();
        }
        return sResponse;
    }

结果成功!