android网络图片的下载

android网络图片的下载

 /**
      * Get image from newwork
      *
      * @param path
      *            The path of image
      * @return byte[]
      * @throws Exception
      */
     public byte[] getImage(String path) throws Exception {
         URL url = new URL(path);
         HttpURLConnection conn = (HttpURLConnection) url.openConnection();
         conn.setConnectTimeout(5 * 1000);
         conn.setRequestMethod("GET");
         InputStream inStream = conn.getInputStream();
         if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
             return readStream(inStream);
         }
         return null;
     }

     /**
      * Get data from stream
      *
      * @param inStream
      * @return byte[]
      * @throws Exception
      */
     public static byte[] readStream(InputStream inStream) throws Exception {
         ByteArrayOutputStream outStream = new ByteArrayOutputStream();
         byte[] buffer = new byte[1024];
         int len = 0;
         while ((len = inStream.read(buffer)) != -1) {
             outStream.write(buffer, 0, len);
         }
         outStream.close();
         inStream.close();
         return outStream.toByteArray();
     }

     /**
      * 保存文件
      *
      * @param bm
      * @param fileName
      * @throws IOException
      */
     public void saveFile(byte[] data, String fileName) throws IOException {
         File dirFile = new File(Constant.PATH_PIC);
         if (!dirFile.exists()) {
             dirFile.mkdir();
         }
         File myCaptureFile = new File(Constant.PATH_PIC + fileName);
         BufferedOutputStream bos = new BufferedOutputStream(
                 new FileOutputStream(myCaptureFile));
         Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
         bitmap.compress(Bitmap.CompressFormat.JPEG, 80, bos);
         bos.flush();
         bos.close();
     }

     /**
      * 加载本地图片
      *
      * @param url
      * @return
      */
     public static Bitmap getLoacalBitmap(String url) {
         try {
             FileInputStream fis = new FileInputStream(url);
             return BitmapFactory.decodeStream(fis); // /把流转化为Bitmap图片

         } catch (FileNotFoundException e) {
             e.printStackTrace();
             return null;
         }
     }