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;
}