URLConnection 总是返回 400 : Bad Request 当我尝试上传 .wav 文件时

Question

我想实现一些代码，这些代码完全符合我在 Mac 终端中执行 CURL 命令时所完成的工作，即将 .wav 文件上传到服务器。 我之前已经为一台服务器完成了这项工作，所以我的一般想法有效（以及我的代码）， ....但现在我想在不同的服务器上完成相同的操作。 这次我遇到了麻烦，我得到的只是“400：Bad Request”

这是我想在 Android 上执行的 CURL 命令，我添加了一个“-v”，因此您可以看到我的命令的详细信息。

curl -F file=@audio_life.wav 11.2.333.44:14141/transcribe -v

在终端输出日志：

*   Trying 11.2.333.44...
* Connected to 11.2.333.44 (11.2.333.44) port 14141 (#0)
> POST /transcribe HTTP/1.1
> Host: 11.2.333.44:14141
> User-Agent: curl/7.43.0
> Accept: */*
> Content-Length: 304898
> Expect: 100-continue
> Content-Type: multipart/form-data; boundary=------------------------62142b52672c69e0
> 
* Done waiting for 100-continue
< HTTP/1.1 201 Created
< Content-Type: application/json
< Content-Length: 915

这是我的代码，我总是得到 400:Bad Request 响应，如您所见，我试图复制标头。我究竟做错了什么？我怎样才能知道错误可能是什么？

String wavpath=Environment.getExternalStorageDirectory().getAbsolutePath()+"/ArtificialSolutions/"+StorageUtils.AUDIO_FILE_NAME+".wav"; 
                File wavfile = new File(wavpath);
                FileInputStream fileInputStream = new FileInputStream(wavpath);
                connectURL = new URL(ASR_URL_VOCITEC);
                String filevalue = StorageUtils.AUDIO_FILE_NAME+".wav";
                HttpURLConnection conn = (HttpURLConnection)connectURL.openConnection();
                conn.setDoInput(true);
                conn.setDoOutput(true);
                conn.setUseCaches(false);
                conn.setRequestMethod("POST");
                conn.setRequestProperty("Host","11.2.333.44:14141");
                conn.setRequestProperty("User-Agent", "android");
                conn.setRequestProperty("Accept","*/*");
                conn.setRequestProperty("Transfer-Encoding", "chunked");
                conn.setRequestProperty("Expect", "100-continue");
                conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=------------------------f016e997e308ec07");//+boundary);
                DataOutputStream dos = new DataOutputStream(conn.getOutputStream());
                dos.writeBytes(twoHyphens + boundary + lineEnd);
                dos.writeBytes("Content-Disposition: form-data; name=\"File\""+ lineEnd);
                //dos.writeBytes("Content-Disposition: form-data; File=\""+wavpath+"\""+ lineEnd);
                dos.writeBytes(lineEnd);

                dos.writeBytes(wavpath);
                dos.writeBytes(lineEnd);
                dos.writeBytes(twoHyphens + boundary + lineEnd);
                int bytesAvailable = fileInputStream.available();     
                int maxBufferSize = 1024;
                int bufferSize = Math.min(bytesAvailable, maxBufferSize);
                byte[ ] buffer = new byte[bufferSize];
                int bytesRead = fileInputStream.read(buffer, 0, bufferSize);

                while (bytesRead > 0){
                        dos.write(buffer, 0, bufferSize);
                        bytesAvailable = fileInputStream.available();
                        Log.e("joshtag","BytesAvailable: "+bytesAvailable);
                        bufferSize = Math.min(bytesAvailable,maxBufferSize);
                        if(bytesAvailable>maxBufferSize){
                            bytesRead = fileInputStream.read(buffer, 0,bufferSize);
                        }
                        else{
                            bytesRead = fileInputStream.read(buffer, 0,bytesAvailable);
                            dos.write(buffer, 0, bytesAvailable);
                            break;
                        }
                }
                dos.writeBytes(lineEnd);
                dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
                fileInputStream.close();//63532 , 64556

                dos.flush();

                Log.e(Tag,"File Sent, Response: "+String.valueOf(conn.getResponseCode()));
                Log.e(Tag,"File Sent, ResponseMSG: "+String.valueOf(conn.getResponseMessage()));

这是我从服务器返回的消息的打印输出：

{null=[HTTP/1.1 400 Bad Request], Content-Length=[42], Content-Type=[text/plain], X-Android-Received-Millis=[1449836192887], X-Android-Response-Source=[NETWORK 400], X-Android-Sent-Millis=[1449836192719]}

注意：我根据自己的知识编写了这个代码，在检查了 StartOverflow 上的相关帖子之后，整个代码都在 AsyncTask 的 doInBackground 方法中，所以让我们关注这里。希望能帮到我！！谢谢。

Answer 1

在修改了很多代码之后，我找到了一种使用 URLConnection 上传 wav 文件的方法，并使用多方。代码如下，欣赏：

public int uploadWav(String sourceFileUri) {  
    String wavpath=Environment.getExternalStorageDirectory().getAbsolutePath()+"/myAppFolder/"+StorageUtils.AUDIO_FILE_NAME+".wav";
    String filename=wavpath;
    HttpURLConnection conn = null;
    DataOutputStream dos = null;  
    String lineEnd = "\r\n";
    String twoHyphens = "--";
    String boundary = "------------------------afb19f4aeefb356c";
    int bytesRead, bytesAvailable, bufferSize;
    byte[] buffer;
    int maxBufferSize = 1 * 1024 * 1024; 
    File sourceFile = new File(fileName); 
    Log.e("joshtag", "Uploading: sourcefileURI, "+fileName);

    if (!sourceFile.isFile()) {                                
         Log.e("uploadFile", "Source File not exist :"+wavpath);//FullPath);                        
         return 0;  //RETURN #1
         }
    else{
        try{        
             Log.v("joshtag","UPLOADING .WAV FILE");
             FileInputStream fileInputStream = new FileInputStream(sourceFile);   
             URL url = new URL(SERVER_URL);
             Log.v("joshtag","UL URL: "+url.toString());

             // Open a HTTP  connection to  the URL
             conn = (HttpURLConnection) url.openConnection(); 
             conn.setDoInput(true); // Allow Inputs
             conn.setDoOutput(true); // Allow Outputs
             conn.setUseCaches(false); // Don't use a Cached Copy            s       
             conn.setRequestMethod("POST");                     
            // conn.setRequestProperty("Connection", "Keep-Alive");
             conn.setRequestProperty("ENCTYPE", "multipart/form-data");
             conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);     
             conn.setRequestProperty("file", sourceFile.getName()); 
             //so on and so forth...
             //conn.setRequestProperty("param", "value");  
             conn.setRequestProperty("connection", "close");
             dos = new DataOutputStream(conn.getOutputStream());          
             dos.writeBytes(twoHyphens + boundary + lineEnd); 
             dos.writeBytes("Content-Disposition: form-data; name=\"file\";filename=\"" + sourceFile.getName() + "\"" + lineEnd);                    
             dos.writeBytes(lineEnd);      

             // create a buffer of  maximum size
             bytesAvailable = fileInputStream.available();           
             bufferSize = Math.min(bytesAvailable, maxBufferSize);
             buffer = new byte[bufferSize];         
             // read file and write it into form...
             bytesRead = fileInputStream.read(buffer, 0, bufferSize);   

             while (bytesRead > 0) {                        
                    dos.write(buffer, 0, bufferSize);
                    bytesAvailable = fileInputStream.available();
                    bufferSize = Math.min(bytesAvailable, maxBufferSize);
                    bytesRead = fileInputStream.read(buffer, 0, bufferSize);
                    Log.i("joshtag","->");
                    }
             Log.i("joshtag","->->");
             // send multipart form data necesssary after file data...
             dos.writeBytes(lineEnd);
             dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
             conn.connect();
             Log.i("joshtag","->->->");
             // Responses from the server (code and message)
             serverResponseCode = conn.getResponseCode();
             Log.i("joshtag","->->->->");
             String serverResponseMessage = conn.getResponseMessage().toString();     

             Log.i("joshtag","->->->->->");
             Log.i("joshtag", "HTTP Response is : "  + serverResponseMessage + ": " + serverResponseCode);   

             // ------------------ read the SERVER RESPONSE
             DataInputStream inStream;
             String str="";
             String response="";
             try {
                 Log.i("joshtag","->->->->->->");
                 inStream = new DataInputStream(conn.getInputStream());

                 while ((str = inStream.readLine()) != null) {
                     Log.e("joshtag", "SOF Server Response" + str);
                     response=str;
                    }
                 inStream.close();
                }
             catch (IOException ioex) {
                Log.e("joshtag", "SOF error: " + ioex.getMessage(), ioex);
                }
             conn.disconnect();
             conn=null;                       
             //close the streams //
             fileInputStream.close();
             dos.flush();
             dos.close();    

             if(serverResponseCode == 201){       
                 loge("*** SERVER RESPONSE: 201"+response);
                }//END IF Response code 201  
            // conn.disconnect();
            }//END TRY - FILE READ      
        catch (MalformedURLException ex) {
            ex.printStackTrace();   
            Log.e("joshtag", "UL error: " + ex.getMessage(), ex);  
            } //CATCH - URL Exception

         catch (Exception e) {           
            e.printStackTrace();             
            Log.e("Upload file to server Exception", "Exception : "+ e.getMessage(), e);
            } 

        return serverResponseCode; //after try       
        }//END ELSE, if file exists.
    }