java - 如何在 Android 中读取文件上传的服务器响应(JSON)？

Question

我有这段代码可以将文件上传到我们的服务器 (PHP)。如何读取服务器的输出，而不仅仅是代码 200 或“ok”，还有实际的 JSON 响应？

我看过使用 InputStreamReader 和 BufferedReader 的示例，但我不确定如何使用它们...

public String uploadFile(){     
    String result = "Result:";
    HttpURLConnection connection = null;
    DataOutputStream outputStream = null;
    DataInputStream inputStream = null;

    String pathToOurFile = "/storage/emulated/0/My Documents/My Recordings/Voice0007.aac";
    String lineEnd = "\r\n";
    String twoHyphens = "--";
    String boundary =  "*****";

    int bytesRead, bytesAvailable, bufferSize;
    byte[] buffer;
    int maxBufferSize = 1*1024*1024*1024;

    try
    {
        FileInputStream fileInputStream = new FileInputStream(new File(pathToOurFile) );

        URL url = new URL(SERVER_URL);
        connection = (HttpURLConnection) url.openConnection();

        // Allow Inputs & Outputs.
        connection.setDoInput(true);
        connection.setDoOutput(true);
        connection.setUseCaches(false);

        // Set HTTP method to POST.
        connection.setRequestMethod("POST");

        connection.setRequestProperty("Connection", "Keep-Alive");
        connection.setRequestProperty("Content-Type", "multipart/form-data;boundary="+boundary);

        outputStream = new DataOutputStream( connection.getOutputStream() );
        outputStream.writeBytes(twoHyphens + boundary + lineEnd);
        outputStream.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" + pathToOurFile +"\"" + lineEnd);
        outputStream.writeBytes(lineEnd);

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

        // Read file
        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);
        }

        outputStream.writeBytes(lineEnd);
        outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
        //inputStream = (DataInputStream) connection.getInputStream();

        // Responses from the server (code and message)
        int serverResponseCode = connection.getResponseCode();

        // doesn't show the JSON respnse :(
        String serverResponseMessage = connection.getResponseMessage(); 

        String line = "";
        while ((line = bufferReader.readLine()) != null) {
            Log.d("Test", line);
        }
        bufferReader.close();                    

        fileInputStream.close();
        outputStream.flush();
        outputStream.close();
        result = serverResponseCode + "-"+ serverResponseMessage;
    }
    catch (Exception ex)
    {
        result = "exception: "+(ex.getStackTrace().toString()) + "\n" + ex.toString();

    }finally{
        return result;
    }
}

Answer 1

您要查找的 JSON 已写入 HTTP 响应 Entity Body .

要获取它，您需要获取 Connections InputStream 并像这样读取它:

InputStream in;
try {
    in = connection.getInputStream();
    byte[] buffer = new byte[1024];
    int read;
    while ((read = in.read(buffer)) > 0) {
        System.out.println(new String(buffer, 0, read, "utf-8"));
    }
} finally {
    in.close();
}