안드로이드의 HTTPComponents multipart/form-data

Question

Apache HTTPComponents를 사용하여 POST 쿼리에서 파일을 보내는 방법은 무엇입니까?

Answer 1

한 가지 가능한 해결책은 여기에 설명 된 바와 같이, 스스로 HTTP 헤더를 생성하는 것입니다 - http://en.wikipedia.org/wiki/MIME 내가 같은 기능을 쓴

("여러 부분 메시지"참조). 어쩌면 그것은 잘 쓰여진 것이 아니지만 훌륭하게 작동합니다.

private static final String REQUEST_BOUNDARY = "somethingUniqueForYourQuery"; 

private static String sendRequest(String url, String method, String params, File file, String fileField) { 
    HttpURLConnection httpConn = null; 
    StringBuilder httpContent = new StringBuilder(); 
    String lineEnd = "\r\n"; 
    String twoHyphens = "--"; 
    byte[] fileContent = new byte[0]; 
    int fileSize = 0; 

    // trying to read file 
    if (file != null) { 
     try { 
      FileInputStream fileInputStream = new FileInputStream(file); 

      httpContent.append(twoHyphens + REQUEST_BOUNDARY + lineEnd); 
      httpContent.append("Content-Disposition: form-data; name=\"" + fileField + "\"; filename=\"" + file.getName() + "\"" + lineEnd); 
      httpContent.append(lineEnd); 

      fileSize = fileInputStream.available(); 
      fileContent = new byte[fileSize]; 
      fileInputStream.read(fileContent, 0, fileSize); 
      fileInputStream.close(); 
     } 
     catch (Exception e){ 
      Log.d(DEBUG_TAG, "Exception occured: " + e.toString()); 
     } 
    } 

    // trying to perform request 
    try { 
     httpConn = (HttpURLConnection) new URL(url).openConnection(); 

     if (httpConn != null) { 
      httpConn.setDoInput(true); 
      httpConn.setDoOutput(true); 
      httpConn.setUseCaches(false); 
      httpConn.setConnectTimeout(CONNECTION_TIMEOUT_STRING); 
      httpConn.setRequestMethod(method); 

      if (file != null && httpContent.length() > 0) { 
       httpConn.setRequestProperty("Connection", "Keep-Alive"); 
       httpConn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + REQUEST_BOUNDARY); 

       DataOutputStream dos = new DataOutputStream(httpConn.getOutputStream()); 
       if (params != null) { 
        dos.writeBytes(params); 
       } 
       dos.writeBytes(httpContent.toString()); 
       dos.write(fileContent, 0, fileSize); 
       dos.writeBytes(lineEnd); 
       dos.writeBytes(twoHyphens + REQUEST_BOUNDARY + twoHyphens + lineEnd); 
       dos.flush(); 
       dos.close(); 
      } 
      else if (params != null) { 
       PrintWriter out = new PrintWriter(httpConn.getOutputStream()); 
       out.print(params); 
       out.close(); 
      } 

      httpConn.connect(); 

      int response = httpConn.getResponseCode(); 
      BufferedReader rd; 

      if (httpConn.getErrorStream() == null) { 
       rd = new BufferedReader(new InputStreamReader(httpConn.getInputStream())); 
      } else { 
       rd = new BufferedReader(new InputStreamReader(httpConn.getErrorStream())); 
      } 

      StringBuffer sb = new StringBuffer(); 
      String line; 
      while ((line = rd.readLine()) != null) { 
       sb.append(line + "\n"); 
      } 
      if (rd != null) { 
       rd.close(); 
      } 
      return sb.toString(); 
     } else { 
      Log.d(DEBUG_TAG, "Connection Error"); 
     } 
    } 
    catch (Exception e){ 
     Log.d(DEBUG_TAG, "Exception occured: " + e.toString()); 
    } 
    finally { 
     if (httpConn != null) { 
      httpConn.disconnect(); 
     } 
    } 
    return null; 
}