如何將圖像從Android上傳到Java

Question

我正在開發一種應將圖像從android上傳到java的軟件。 到目前為止，我已經在android上開發了以下客戶端：

        String url=params[0];
        String filePath=params[1];

        File file=new File(filePath);

        MultipartEntityBuilder multipartEntityBuilder=MultipartEntityBuilder.create();
        multipartEntityBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
        multipartEntityBuilder.addPart("file", new FileBody(file));
        HttpPut httpPut=new HttpPut(url);
        HttpClient httpclient = new DefaultHttpClient();
        httpPut.setEntity(multipartEntityBuilder.build());
        HttpResponse response;

        try {
            response = httpclient.execute(httpPut);
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                InputStream instream = entity.getContent();
                String result= convertStreamToString(instream);
                instream.close();
                return result;
            }
        } catch (Exception e) {
        }
        return null;
    }

服務器是：

String path=Server.imagesPath+Utilities.getRandomString(10)+".jpg";
    InputStream inputStream= arg0.getRequestBody();
    File file=new File(path);
    Files.copy(inputStream, file.toPath());
    String response="OK";
    try{
    arg0.sendResponseHeaders(200, response.length());
        OutputStream outputStream=arg0.getResponseBody();
        outputStream.write(response.getBytes());
        outputStream.close();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

該圖像已完全復制到服務器，但已損壞，無法查看。 問題是什么？

Answer 1

看起來好像上傳是以多部分形式完成的，它允許您將圖像插入為要發送的數據的一部分。 但服務器將其讀取為純八位位組流，而不是多部分形式。

您需要選擇一個。 要么將其解釋為服務器上的表單數據，要么將數據作為流而不是表單數據發送。

我建議您看看Apache Commons FileUpload ，它將簡化很多工作。

Answer 2

您還可以使用多個數據部分實體進行圖像上傳

您可以在此處查看完整的演示： http : //niravranpara.blogspot.in/2012/11/upload-video-in-server.html

Answer 3

我最終可以使用本文解決問題：

Android代碼將大文件上傳和下載到服務器

我在Android上使用的代碼是：

        String urlString=params[0];
        String path=params[1];
        File file=new File(path);
        int maxBufferSize=1024;
        URL url=null;
        try {
            url=new URL(urlString);
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        HttpURLConnection connection=null;
        try {
            connection = (HttpURLConnection) url.openConnection();
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }

        connection.setDoInput(true);
        connection.setDoOutput(true);
        connection.setUseCaches(false);
        try {
            connection.setRequestMethod("PUT");
        } catch (ProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        connection.setRequestProperty("Content-Type", "image/jpg");
        OutputStream outputStream=null;
        FileInputStream fileInputStream=null;
        byte[] buffer;
        int bytesRead,bytesAvailable,bufferSize;

        try {
            outputStream=connection.getOutputStream();
            fileInputStream=new FileInputStream(file);
            bytesAvailable = fileInputStream.available();
            bufferSize = Math.min(bytesAvailable, maxBufferSize);
            buffer = new byte[bufferSize];
            bytesRead = fileInputStream.read(buffer, 0, bufferSize);

            while(bytesRead > 0){
                outputStream.write(buffer, 0, bufferSize);
                bytesAvailable = fileInputStream.available();
                bufferSize = Math.min(bytesAvailable, maxBufferSize);
                bytesRead = fileInputStream.read(buffer, 0, bufferSize);
            }

            int serverResponseCode = connection.getResponseCode();
            String serverResponseMessage = connection.getResponseMessage();
            Log.d("test Response Code ",Integer.toString(serverResponseCode));
            Log.d("test Response Message ", serverResponseMessage);

        } catch (IOException e) {
            Log.d("test", e.getMessage());
        }