怎么使用获得的OAuth2.0 Access Token调用API

String url=" url?access_token="+access_token;

HttpGet request=new HttpGet(url);

System.out.println("保存的access_token="+access_token);
HttpClient client=new GetDefaultClient().getNewHttpClient();

try
{

HttpResponse response=client.execute(request);

int code=response.getStatusLine().getStatusCode();
if (code == 200)
{

InputStream is = response.getEntity().getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"UTF-8"));
StringBuilder buffer = new StringBuilder();
try
{
String line;
while ((line=reader.readLine())!=null)
{
buffer.append(line);
}
} finally
{
reader.close();
}
String string = buffer.toString();
System.out.println(string);

//return Integer.parseInt(string);

}
} catch (UnsupportedEncodingException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClientProtocolException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
} 
}