public static void main(String[] args) throws IOException { String fileName = "http://(サーバIP)/kcs/sound/kc(shipID)/(fileNum).mp3"; URL url = new URL(fileName); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("GET"); conn.setInstanceFollowRedirects(false); conn.setRequestProperty("Referer","http://(サーバIP)/kcs/mainD2.swf"); conn.connect(); int status = conn.getResponseCode(); // ファイルが存在している場合200が入る conn.disconnect(); }