Android应用中怎么获取网址的HTML代码

public String getHTML(String aUrl, String aEncode) throws Exception {    URL url = new URL(aUrl);    HttpURLConnection conn = (HttpURLConnection) url.openConnection();    conn.setConnectTimeout(5000);    conn.setRequestMethod("GET");    if (conn.getResponseCode() == 200){      InputStream inputStream = conn.getInputStream();      ByteArrayOutputStream outStream = new ByteArrayOutputStream();      byte[] buffer = new byte[1024];      int len = 0;      while( (len = inputStream.read(buffer)) != -1){        outStream.write(buffer, 0, len);      }      String htmlStr = new String(outStream.toByteArray(), aEncode);      inputStream.close();      outStream.close();      return htmlStr;    }    return null;}