Urlconnection对象获得inputStream值

@Override
        protected Bitmap doInBackground(String... params) {
            String url=params[0];
            Bitmap bitmap=null;         
            URLConnection connection;
            InputStream is;
            //通过URL.openConnection方法获得一个URLConnection对象         
            try {
                URL myurl = new URL(url);
                connection=myurl.openConnection();
                connection.connect();
                is=connection.getInputStream();

                //包装一下
                //BufferedInputStream bis=new BufferedInputStream(is);
                //将一个输入流解析为一个BitMap对象
                bitmap=BitmapFactory.decodeStream(is);
                //关闭输入流
                is.close();
                //bis.close();
            } catch (MalformedURLException e) {
                Log.i("info", "MalformedURLException");
                e.printStackTrace();
            } catch (IOException e) {
                Log.i("info", "IOException:"+e.toString());
                e.printStackTrace();
            }




            return bitmap;
        }