code: public static List<String> getTopSentenceList(String document, int size, String sentence_separator)
      {
          List<String> sentenceList = splitSentence(document, sentence_separator);
          List<List<String>> docs = convertSentenceListToDocument(sentenceList);
          TextRankSentence textRank = new TextRankSentence(docs);
          int[] topSentence = textRank.getTopSentence(size);
          List<String> resultList = new LinkedList<String>();
          for (int i : topSentence)
          {
              resultList.add(sentenceList.get(i));
          }
          return resultList;
      }
docs: 一句话调用接口
  
  @param document 目标文档
  @param size     需要的关键句的个数
  @param sentence_separator 句子分隔符，正则格式， 如：[。？?！!；;]
  @return 关键句列表