I want to import a part of a web page

I want to bring the notice of the school homepage to my app. but I don't know what the problem is. I'd like to bring in Tag , link and day of the week, too.

here is my noticed.dart

class _HotNewsWidgetState extends State<HotNewsWidget> {
  List<String> title = List();
  List<String> post = List();
  List<String> link = List();
  void _getDataFromWeb() async {
    final response =
        await http.get('http://yongwon-h.gne.go.kr/yongwon-h/main.do');
    dom.Document document = parser.parse(response.body);
    final elements = document.getElementsByClassName('ul_list');
    final element2 = document.getElementsByClassName('btn_more');
    final linkElemnt = document.getElementsByClassName('ul_list');
    setState(() {
      title = elements
          .map((element) => element.getElementsByTagName("a")[0].innerHtml)
          .toList();
      post = element2
          .map((element) => element.getElementsByTagName("span")[0].innerHtml)
          .toList();
      link = linkElemnt
          .map((element) =>
              element.getElementsByTagName("a")[0].attributes['href'])
          .toList();
    });
  }

here is School homepage html

<div class="notice060">
                    
                    <div class="list_box on">
                        <ul class="ul_list">

                        <li><a href="/yongwon-h/na/ntt/selectNttInfo.do?nttSn=85179304&amp;mi=73746">제8기 진해용원고등학교운영위원회 학부모위원 당선자 공고</a>
                            <span class="date">2021.03.19</span>
                            </li>
                            
                            <li><a href="/yongwon-h/na/ntt/selectNttInfo.do?nttSn=85156448&amp;mi=73746">20201학년도 대학수학능력시험 시행기본계획</a>
                            <span class="date">2021.03.17</span>
                            </li>
                            
                            <li><a href="/yongwon-h/na/ntt/selectNttInfo.do?nttSn=85141070&amp;mi=73746">제8기 학교운영위원회 교원위원 입후보자 등록현황</a>
                            <span class="date">2021.03.15</span>
                            </li>
                            
                            <li><a href="/yongwon-h/na/ntt/selectNttInfo.do?nttSn=85129816&amp;mi=73746">3월 3주 전학년 학사운영 안내</a>
                            <span class="date">2021.03.12</span>
                            </li>

                            <li><a href="/yongwon-h/na/ntt/selectNttInfo.do?nttSn=85117819&amp;mi=73746">2021 찾아가는 교육정책 설명회</a>
                            <span class="date">2021.03.10</span>
                            </li>

                        </ul>

                    </div>
                
</div>

explanation homepage picture