Erhalten Sie JSON vom Server

Question

Ich lade ein Bild von Android App auf Server und als Antwort vom Server sende ich JSON-Werte.

Wie kann ich das JSON in meiner App bekommen?

  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; 
      } 
     } 

Normalerweise, wenn ich httpClient verwende ich las es mit

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

Versuchen Sie den folgenden Code unter Verwendung der Reaktion/Fehler aus dem HttpURLConnection

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; 
    } 

jedoch zu lesen, ich Ich rate Ihnen, entweder Volley oder Retrofit als Ihren Http-Client zu verwenden, da sie eine Menge bieten zusätzliche Vorteile gegenüber HttpUrlConnection und AsyncTask. Ich persönlich bevorzuge Retrofit 2, da es mir Tonnen von Vorteilen einschließlich Caching, mehrteiligen Upload/Download, Logging mit schneller Antwort