java url

public String getRequestValues()
    {
        String urlStr = "http://";
        URL url;
        String sTotalString = null;
        try
        {
            url = new URL(urlStr);
            URLConnection URLconnection = url.openConnection(); 
            HttpURLConnection httpConnection = (HttpURLConnection)URLconnection; 
            int responseCode = httpConnection.getResponseCode(); 
            if (responseCode == HttpURLConnection.HTTP_OK)
            { 
                System.out.println("访问成功!·······");
                InputStream urlStream = httpConnection.getInputStream(); 
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(urlStream)); 
                String sCurrentLine = ""; 
                StringBuffer stemp = new StringBuffer();
                while ((sCurrentLine = bufferedReader.readLine()) != null)
                { 
                    stemp.append(sCurrentLine);
                    //sTotalString += sCurrentLine; 
                } 
                sTotalString = stemp.toString();
                System.err.println("sTotalString value is:"+sTotalString);
                   //假设该url页面输出为"OK" 
               if (null != sTotalString && !"null".equalsIgnoreCase(sTotalString))
               {
                   System.out.println("成功!");
               } else {
                   System.out.println("失败!");
                } 
            }else{
                System.err.println("访问失败!");
             }
        }catch (Exception e){
            e.printStackTrace();
        }
        return sTotalString;
    }