docs: public void tagFile(String input,String output,String sep){
  		String s = tagFile(input,"\n");
  		try {
  			OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(
  					output), "utf-8");
  			BufferedWriter bw = new BufferedWriter(writer);
  			bw.write(s);
  			bw.close();
  		} catch (Exception e) {
  			System.out.println("写输出文件错误");
  			e.printStackTrace();
  		}
  	}