Question

我将图片从Android应用上传到服务器，并作为服务器的响应我发送JSON值。

如何在我的应用中获取该JSON？

            HttpURLConnection httpURLConnection;
            DataOutputStream dataOutputStream;
            ...
            File file = new File(path);

            if (file.isFile()) {
                try {
                    FileInputStream fileInputStream = new FileInputStream(file);
                    URL url = new URL("http://something.com/upload.php");

                    httpURLConnection = (HttpURLConnection) url.openConnection();
                    httpURLConnection.setDoInput(true);
                    httpURLConnection.setDoOutput(true);
                    httpURLConnection.setUseCaches(false);
                    httpURLConnection.setRequestMethod("POST");
                    httpURLConnection.setRequestProperty("Connection", "Keep-Alive");
                    httpURLConnection.setRequestProperty("ENCTYPE", "multipart/form-data");
                    httpURLConnection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
                    httpURLConnection.setRequestProperty("File", path);

                    dataOutputStream = new DataOutputStream(httpURLConnection.getOutputStream());

                    dataOutputStream.writeBytes(twoHyphens + boundary + lineEnd);
                    dataOutputStream.writeBytes("Content-Disposition: form-data; name=\"file\";filename=\"" + path + "\"" + lineEnd);

                    dataOutputStream.writeBytes(lineEnd);

                    bytesAvailable = fileInputStream.available();

                    bufferSize = Math.min(bytesAvailable, maxBufferSize);
                    buffer = new byte[bufferSize];

                    bytesRead = fileInputStream.read(buffer, 0, bufferSize);

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

                    dataOutputStream.writeBytes(lineEnd);
                    dataOutputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

                    serverResponseCode = httpURLConnection.getResponseCode();

                    fileInputStream.close();
                    dataOutputStream.flush();
                    dataOutputStream.close();

                }
                return true;
            }
            else {
                return false;
            }
        }

通常当我使用httpClient时，我会用

读取它

HttpResponse httpResponse = httpClient.execute(httpPost);

InputStream inputStream = httpResponse.getEntity().getContent();

BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, Charset.forName("utf-8")), 8);
String line;
jsonValue = "";

while ((line = reader.readLine()) != null) {
   jsonValue += line;
}

jsonObject = new JSONObject(jsonValue);

Answer 1

尝试使用以下代码从 HttpUrlConnection

中读取响应/错误

HttpURLConnection httpURLConnection;
    DataOutputStream dataOutputStream;
    ...
    File file = new File(path);

    if (file.isFile()) {
        try {
            FileInputStream fileInputStream = new FileInputStream(file);
            URL url = new URL("http://something.com/upload.php");

            httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setDoInput(true);
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setUseCaches(false);
            httpURLConnection.setRequestMethod("POST");
            httpURLConnection.setRequestProperty("Connection", "Keep-Alive");
            httpURLConnection.setRequestProperty("ENCTYPE", "multipart/form-data");
            httpURLConnection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
            httpURLConnection.setRequestProperty("File", path);

            dataOutputStream = new DataOutputStream(httpURLConnection.getOutputStream());

            dataOutputStream.writeBytes(twoHyphens + boundary + lineEnd);
            dataOutputStream.writeBytes("Content-Disposition: form-data; name=\"file\";filename=\"" + path + "\"" + lineEnd);

            dataOutputStream.writeBytes(lineEnd);

            bytesAvailable = fileInputStream.available();

            bufferSize = Math.min(bytesAvailable, maxBufferSize);
            buffer = new byte[bufferSize];

            bytesRead = fileInputStream.read(buffer, 0, bufferSize);

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

            dataOutputStream.writeBytes(lineEnd);
            dataOutputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

            serverResponseCode = httpURLConnection.getResponseCode();

            if(serverResponseCode!=200{
                //error occurred
                BufferedReader in=new BufferedReader(new
                        InputStreamReader(
                        httpURLConnection.getErrorStream()));

                StringBuffer sb = new StringBuffer("");
                String line="";

                while((line = in.readLine()) != null) {

                    sb.append(line);
                    break;
                }

                String errorString=sb.toString();
            }else{
                BufferedReader in=new BufferedReader(new
                        InputStreamReader(
                        connection.getInputStream()));

                StringBuffer sb = new StringBuffer("");
                String line="";

                while((line = in.readLine()) != null) {

                    sb.append(line);
                    break;
                }

                String response=sb.toString();
                Log.d(TAG,sb.toString());
                in.close();
            }

            fileInputStream.close();
            dataOutputStream.flush();
            dataOutputStream.close();
            //do whatever you wish to do with the error/response string then

        }
        return true;
    }
    else {
        return false;
    }

但是，我建议你使用Volley或Retrofit作为你的Http客户端，因为它们提供了比HttpUrlConnection和AsyncTask更多的额外优势。我个人更喜欢Retrofit 2，因为它给了我很多优势，包括缓存，分段上传/下载，日志记录以及更快的响应

从服务器获取返回的JSON

1 个答案: