bufferedreader操作文件出现Connection timed out异常

  int count=0;

  String urlStr ="http://地址";

  try 
  {
            URL url = new URL(urlStr);
            BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream(),"GBK"));   
            String line=null;
            do
            {
                    line = reader.readLine();
                    if(line!=null)
                    {
                          str +=line;
                    }
            }
            while(line!=null);
            reader.close();
            count = 0;
            return str;
  }  
  catch (Exception e) 
  {
            e.printStackTrace();
            String qq01 = "网络异常01开始：("+e.getMessage()+")结束！";
            String qq02 = "网络异常02开始：("+e.getLocalizedMessage()+")结束！";
            System.out.println(qq01);
            System.out.println(qq02);
            count++;
            if("Connection timed out".equals(e.getMessage()) && count<3)//出现异常时连续调用两次
            {   
                    回调方法();
            }
            return "6";
  }