判断一个连接是否成功

try { 
 
            URL url = new URL("http://"+params[0]); 
 
    HttpURLConnection urlc = (HttpURLConnection) url.openConnection(); 
    urlc.setRequestProperty("User-Agent", "Android Application:"+Z.APP_VERSION); 
    urlc.setRequestProperty("Connection", "close"); 
    urlc.setConnectTimeout(1000 * 30); // mTimeout is in seconds 
            urlc.connect(); 
    if (urlc.getResponseCode() == 200) { 
        Main.Log("getResponseCode == 200"); 
            return new Boolean(true); 
    } 
    } catch (MalformedURLException e1) { 
            // TODO Auto-generated catch block 
            e1.printStackTrace(); 
} catch (IOException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
    }