我正在尝试使用HttpUrlConnection将图像发送到服务器，因为它是Google推荐的。我决定将图像转换为Base64字符串，然后将其发送到服务器，然后将其解码为.jpg文件。但是这种方法仅适用于小尺寸缩略图，而我无法发送全尺寸图像。

这是android客户端代码：

 public static void postData(Bitmap imageToSend) {



        try

        {
            URL url = new URL("http://");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");

            conn.setDoInput(true);
            conn.setDoOutput(true);

            conn.setRequestProperty("Connection", "Keep-Alive");
            conn.setRequestProperty("Cache-Control", "no-cache");

            conn.setReadTimeout(35000);
            conn.setConnectTimeout(35000);


            ByteArrayOutputStream bos = new ByteArrayOutputStream();

            // writes a compress version of Bitmap to a specified outputstream
            imageToSend.compress(Bitmap.CompressFormat.JPEG, 100, bos);

            byte[] byteArray = bos.toByteArray();
            String imageEncoded = Base64.encodeToString(byteArray, Base64.DEFAULT);

            List<NameValuePair> params = new ArrayList<NameValuePair>();
            params.add(new BasicNameValuePair("image", imageEncoded));


            OutputStream os = conn.getOutputStream();
            BufferedWriter writer = new BufferedWriter(
                    new OutputStreamWriter(os, "UTF-8"));

            // getQuery is function for creating a URL encoded string
            writer.write(getQuery(params));

            System.out.println("Response Code: " + conn.getResponseCode());

            InputStream in = new BufferedInputStream(conn.getInputStream());
            Log.d("sdfs", "sfsd");
            BufferedReader responseStreamReader = new BufferedReader(new InputStreamReader(in));
            String line = "";
            StringBuilder stringBuilder = new StringBuilder();
            while ((line = responseStreamReader.readLine()) != null)
                stringBuilder.append(line).append("\n");
            responseStreamReader.close();

            String response = stringBuilder.toString();
            System.out.println(response);

            bos.flush();
            bos.close();
            in.close();
            conn.disconnect();

        }

        catch(MalformedURLException e) {
            e.printStackTrace();
        }

        catch(IOException e) {
            e.printStackTrace();
        }


}

Node.js服务器代码：

function base64_decode(base64str,file) {

   var bitmap = new Buffer(base64str,'base64');

   //writing into an image file

   fs.writeFile(file, bitmap);

   //write a text file

    console.log('File created from base64 encoded string');

}



app.post("/", function (req,res,next) {

        //requesting the value of the image key which is urlencoded base 64 string

        var image = req.body.image;

        console.log(req.body.image);

        base64_decode(image,'newImage.jpg');



        res.writeHead(200, {'Content-Type':'text/plain'});

        res.write('the image is saved');

        res.end();

        if (req.url != "/")

           next();

由于BufferedWriter的大小限制，我无法对完整尺寸的图像使用相同的方法-base64编码的字符串太长了。

另一种方法是使用HttpPost和MultipartEntity，但是API22中已弃用了这两种方法，而且我不知道如何在服务器端处理请求。在其他示例中，使用了一些包装，例如两个连字符，border，crlf，但我找不到原因。

我需要一个带有HttpUrlConnection的示例

感谢您的帮助，因为我是Android和node.js的新手