URL 파일 확인.

	
private boolean isExist(String url)
	{
		try {
			URLConnection con = new URL(url).openConnection();
			HttpURLConnection urlCon = (HttpURLConnection)con;
			urlCon.setRequestMethod("HEAD");
			urlCon.setFollowRedirects(false);
			int rescode = urlCon.getResponseCode() ;
			if ( rescode == 200 ) { 
				return true;
			}
			
		} catch (Exception e) {
			// TODO Auto-generated catch block
		}
		return false; 
	}