android中使用httpget抓取网页html代码，无法获得完整数据

URL url = new URL("http://www.baidu.com");
HttpURLConnection con = (HttpURLConnection)url.openConnection();
con.connect();
InputStream is = con.getInputStream();

BufferedReader br = new BufferedReader(new InputStreamReader(is));
String line;
StringBuilder builder = new StringBuilder();
while((line = br.readLine()) != null){
builder.append(line);
}

System.out.println(builder.toString());