public TwitterCrawler() {
		
		String appendix = getFilenameApd();
		fileName = "./"+fileFolder+"/"+appendix;
		Settings.tableName = appendix+"COR";
		
		checkFolder();
		Settings.queryKeywords = Settings.baseKeywords;
		writeKeywordFile(Settings.baseKeywords,false);
		writeKeywordFile(Settings.blackList,true); //blacklist writing

		estabTwitterConn();
		try {startCollection();} 
	       catch (SQLException e) {e.printStackTrace();}
	}