获取网络资源保存本地

public void saveToFile(String destUrl) {
       FileOutputStream fos = null;
       BufferedInputStream bis = null;
       HttpURLConnection httpUrl = null;
       URL url = null;
       intBUFFER_SIZE = 1024;
       byte[] buf = newbyte[BUFFER_SIZE];
       int size = 0;
       try {
           url = new URL(destUrl);
           httpUrl = (HttpURLConnection) url.openConnection();
           httpUrl.connect();
           bis = new BufferedInputStream(httpUrl.getInputStream());
           String fileName = destUrl.substring(destUrl.lastIndexOf("/"));
           System.out.println(fileName);
           fos = new FileOutputStream("e:\haha.jpg");
           while ((size = bis.read(buf)) != -1) {
              fos.write(buf, 0, size);
           }
           fos.flush();
       } catch (IOException e) {
           e.printStackTrace();
       } catch (ClassCastException e) {
           e.printStackTrace();
       } finally {
           try {
              fos.close();
              bis.close();
              httpUrl.disconnect();
           } catch (IOException e) {
              e.printStackTrace();
           } catch (NullPointerException e) {
              e.printStackTrace();
           }
       }
    }