解码从Servlet接收的InputStream后的裁剪图像

Question

我已成功从我的Servlet下载png图像，但相应图像的InputStream（存储为带Bitmap bitmap = BitmapFactory.decodeStream(InputStream, null, null)的位图）会被无法预测地裁剪。我的代码：

public class StaggeredPrenotaTour extends ActionBarActivity implements CallBack{
    Bitmap mBitmap; 
    ImaveView vImageView; 
    //....
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        //....
        GetXMLTask task = new GetXMLTask(this);
        // Execute the task
        task.execute(new String[]{URL});
    }
    //....
    public void callbackBitmap(Bitmap bitmap){
        mBitmap = bitmap;
        //vImageView.setImageBitmap(bitmap);
    }
    //....

}

GetXMLTask上课：

private class GetXMLTask extends AsyncTask<String, Void, Bitmap> {
    StaggeredPrenotaTour staggeredPrenotaView;

    public GetXMLTask(StaggeredPrenotaTour listView){
        this.staggeredPrenotaView = listView;
    }

    @Override
    protected Bitmap doInBackground(String... urls) {
        Bitmap map = null;
        for (String url : urls) {
            map = downloadImage(url);
        }
        return map;
    }

    // Sets the Bitmap returned by doInBackground
    @Override
    protected void onPostExecute(Bitmap result) {
        staggeredPrenotaView.callbackBitmap(result);
        // setimageView.setImageBitmap(result);
    }

    // Creates Bitmap from InputStream and returns it
    private Bitmap downloadImage(String url) {
        Bitmap bitmap = null;
        InputStream stream = null;
        BitmapFactory.Options bmOptions = new BitmapFactory.Options();
        bmOptions.inSampleSize = 1;

        try {
            stream = getHttpConnection(url);
            bitmap = BitmapFactory.decodeStream(stream, null, bmOptions);
            stream.close();
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        return bitmap;
    }

    // Makes HttpURLConnection and returns InputStream
    private InputStream getHttpConnection(String urlString)
            throws IOException {
        InputStream stream = null;
        URL url = new URL(urlString);
        URLConnection connection = url.openConnection();

        try {
            HttpURLConnection httpConnection = (HttpURLConnection) connection;
            httpConnection.setRequestMethod("GET");
            httpConnection.connect();

            if (httpConnection.getResponseCode() == HttpURLConnection.HTTP_OK){
                stream = httpConnection.getInputStream();
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return stream;
    }
}

Servlet的{​​{1}}方法：

doGet

在以下屏幕截图中，您可以在@Override public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException { InputStream st = getServletContext().getResourceAsStream("/WEB-INF/imgs/cardbackground9.png"); OutputStream out = resp.getOutputStream(); if (st != null) { byte[] buf = new byte[4096]; int nRead; while( (nRead=st.read(buf)) != -1 ) { out.write(buf, 0, nRead); } st.close(); } out.close(); } //.... 中看到生成的裁剪图像。第二张图显示了第一张图片的原始大小。

为什么会这样切割？我一直在网上思考并尝试了几件事，但直到现在才找到解决办法。