如何將位圖從服務器發送到客戶端？

Question

在我的應用程序中，我正在使用MultiPartEntity將位圖上傳到服務器。

編碼：

public static boolean UploadFile(String stringUrl, byte[] bitmapArray) throws Exception { 
  String uploadUrl = stringUrl;
  HttpPost postRequest = new HttpPost(uploadUrl);
  MultipartEntity entity = new MultipartEntity();
  entity.addPart("image", new ByteArrayBody(bitmapArray, "image/png", "image"));
  postRequest.setEntity(entity);
  HttpResponse httpResponse;
  HttpClient httpClient = getHttpClient();
  httpClient.getParams().setBooleanParameter("http.protocol.handle-redirects",false);
  httpResponse = httpClient.execute(postRequest);
    .
    .
}

然后從請求中獲取位圖並將其存儲在Blob中。

編碼：

private void handleFileUpload(HttpServletRequest request, HttpServletResponse response) {
  try {
    ServletFileUpload upload = new ServletFileUpload();
    FileItemIterator iter = upload.getItemIterator(request);
    FileItemStream imageItem = iter.next();
    InputStream imgStream = imageItem.openStream();
    Blob imageBlob = new Blob(IOUtils.toByteArray(imgStream));
    MyImage myImage = new MyImage(imageItem.getName(), imageBlob);
      .
      .
    } catch (FileUploadException e) {       
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
}

我的問題是：如何使用響應將其發送回客戶端？ 謝謝。

Answer 1

發送回一個鏈接作為響應，並從收到的鏈接開始下載。

Answer 2

response.setContentType("image/png"); // fill proper image type
response.getOutputStream().write(IOUtils.toByteArray(imgStream));

有關使用Google App Engine（Java）提供動態圖片的詳細信息