java在文章中找出關鍵詞

public String attachKeyword(Integer siteId, String txt) {
  if (StringUtils.isBlank(txt)) {
   return txt;
  }
  List<CmsKeyword> list = getListBySiteId(siteId, true, true);
  int len = list.size();
  if (len <= 0) {
   return txt;
  }
  String[] searchArr = new String[len];
  String[] replacementArr = new String[len];
  String[] explanation = new String[len];
  int i = 0;
  for (CmsKeyword k : list) {
   searchArr[i] = k.getName();
   replacementArr[i] = k.getUrl();
   explanation[i] = k.getExplanation();
   i++;
  }
  try {
   Lexer lexer = new Lexer(txt);
   Node node;
   StringBuilder sb = new StringBuilder((int) (txt.length() * 1.2));
   node = lexer.nextNode();
   while ((node = lexer.nextNode()) != null) {
    if (node instanceof TextNode) {
     sb.append(StringUtils.replaceEach(node.toHtml(), searchArr,
       replacementArr));
    } else {
     sb.append(node.toHtml());
    }
   }
   return sb.toString();
  } catch (ParserException e) {
   throw new RuntimeException(e);
  }
 }