docs: private static void clean(String file) throws IOException {
  		
  		StringBuffer sb = new StringBuffer();
  		BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file),Charset.forName("utf8")));
  		String str;
  		while((str = br.readLine())!=null){
  			if(str.length()!=0&&!str.trim().startsWith("<")){
  				if(str.equalsIgnoreCase("root"))
  					continue;
  				if(str.contains("</HEADER> ")||str.contains("</HEADLINE>"))
  					continue;
  				sb.append(str+"\n");
  
  			}				
  		}
  
  		br.close();
  		Writer wr = new OutputStreamWriter(new FileOutputStream(new File(file)),Charset.forName("gbk"));//输出目录
  		wr.write(sb.toString());
  		wr.close();
  
  	}