I'd like to have https:// automatically attached to the link - flutter

Question

When I tried to retrieve img from the website, the link started with /upload/.... instead of https://.
I want to have https:// written automatically in front of me. What should I do?
homepage:
<div class="photo_list">
<ul>
<li>
<a href="/yongwon-h/na/ntt/selectNttInfo.do?nttSn=85189591&mi=73747">
<img src="/upload/bbs/files/2021/hgschl/yongwon-h/ntt/62865/ntt_85189591/thumb/thumb_img_9028b523-7bfb-466f-848c-65870a93b99c1616411595463.jpg" onerror="this.src='/images/co/na/noImg.gif'" alt="대표이미지">
<p>책을 가까이, 책은 나의 친구!! 아침독서의 생활화!!!</p>
<span>
2021.03.22
<br> 조회 6
</span>
</a>
</li>
</ul>
</div>
MY CODE:
import 'package:flutter/material.dart';
import 'package:flutter_share/flutter_share.dart';
import 'package:flutter_staggered_animations/flutter_staggered_animations.dart';
import 'package:http/http.dart' as http;
import 'package:html/dom.dart' as dom;
import 'package:html/parser.dart' as parser;
import 'package:url_launcher/url_launcher.dart';
class UpdatePost extends StatefulWidget {
#override
_UpdatePostState createState() => _UpdatePostState();
}
class _UpdatePostState extends State<UpdatePost> {
List<String> title = List();
List<String> post = List();
List<String> link = List();
List<String> image = List();
void _getDataFromWeb() async {
Uri uri = Uri.parse(
'http://yongwon-h.gne.go.kr/yongwon-h/na/ntt/selectNttList.do?mi=73747&&bbsId=62865');
final response = await http.get(uri);
dom.Document document = parser.parse(response.body);
final link2 = document.getElementsByClassName('photo_list');
final content = document.getElementsByClassName('photo_list');
final elements = document.getElementsByClassName('photo_list');
final ImageElement = document.getElementsByClassName('photo_list');
setState(() {
title = elements
.map((element) => element.getElementsByTagName("p")[0].innerHtml)
.toList();
post = content
.map((element) => element.getElementsByTagName("span")[0].innerHtml)
.toList();
link = link2
.map((element) =>
element.getElementsByTagName("a")[0].attributes['href'])
.toList();
image = ImageElement.map((element) =>
element.getElementsByTagName("img")[0].attributes['src']).toList();
});
}
Future<void> share(dynamic link, String title) async {
await FlutterShare.share(
title: 'Codding Application',
text: title,
linkUrl: link,
chooserTitle: 'Where You Want to Share');
}
#override
void initState() {
_getDataFromWeb();
}
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.black87,
body: post.length == 0
? Text("No data", style: TextStyle(color: Colors.white))
: ListView.builder(
itemCount: post.length,
itemBuilder: (context, index) {
return AnimationConfiguration.staggeredList(
position: index,
duration: const Duration(milliseconds: 375),
child: SlideAnimation(
child: FadeInAnimation(
child: GestureDetector(
onTap: () async {
dynamic url = link[index];
if (await canLaunch(url))
launch(url);
else {
print('error');
}
},
child: Padding(
padding: const EdgeInsets.all(10),
child: Card(
child: Container(
color: Colors.black87,
child: Column(
children: <Widget>[
Container(
child: Image.network(
image[index],
scale: 0.1,
),
),
Align(
alignment: Alignment.centerLeft,
child: Text(
title[index],
style: TextStyle(
fontWeight: FontWeight.bold,
color: Colors.red,
fontSize: 20,
),
),
),
SizedBox(height: 15),
Text(
post[index],
style: TextStyle(
color: Colors.white,
),
),
Row(
children: <Widget>[
FlatButton(
shape: RoundedRectangleBorder(
borderRadius:
BorderRadius.circular(5.0),
side: BorderSide(color: Colors.white)),
onPressed: () {
share(link[index], title[index]);
},
child: Text(
"Share With Friends",
style: TextStyle(
color: Colors.red,
),
),
),
SizedBox(width: 10),
FlatButton(
shape: RoundedRectangleBorder(
borderRadius:
BorderRadius.circular(5.0),
side: BorderSide(color: Colors.white)),
onPressed: () async {
dynamic url = link[index];
if (await canLaunch(url))
launch(url);
else {
print('error');
}
},
child: Text(
"Explore Post",
style: TextStyle(
color: Colors.red,
),
),
),
],
),
],
),
),
),
),
))),
);
},
),
);
}
}
conclusion:
I want to automatically put http://yongwon-h.gne.go.kr in front of the called tag a.
I feel like I'm asking repeatedly, but I really don't know. I googled thousands of sites in a week. Please help me.

Answer 1

import 'dart:async';
import 'package:wnetworking/wnetworking.dart';
final Map<String, Map<String, dynamic>> reDic = {
'notices' : {
'relPath' : '/yongwon-h/main.do',
're' : <RegExp>[
RegExp(r'<h2 class="tit_1">(.|\n|\r|\u2028|\u2029)*?<h2 class="tit_2">'),
RegExp(r'<li><a.+>(.+)<\/a>(.|\n|\r|\u2028|\u2029)*?(\d{4}\.\d\d\.\d\d)'),
]
},
'images' : {
'relPath' : '/yongwon-h/na/ntt/selectNttList.do?mi=73747&&bbsId=62865',
're' : <RegExp>[
RegExp(r'<div class="photo_list">(.|\n|\r|\u2028|\u2029)*?<!-- \/\/게시판 리스트'),
RegExp(r'<img src="(.+)" onerror'),
]
},
};
class Yongwon {
static const _baseUrl = 'http://yongwon-h.gne.go.kr';
static FutureOr<void> fetchNoticies() async {
await _getHTMLObjects(
reDic['notices']!['relPath'],
reDic['notices']!['re']![0],
reDic['notices']!['re']![1],
)
.then((matches) {
if (matches != null) {
matches.forEach((match) => print('${match.group(1)} ..... ${match.group(3)}'));
}
});
}
static FutureOr<void> fetchImages() async {
await _getHTMLObjects(
reDic['images']!['relPath'],
reDic['images']!['re']![0],
reDic['images']!['re']![1],
)
.then((matches) {
if (matches != null) {
matches.forEach((match) => print('$_baseUrl${match.group(1)}'));
}
});
}
static Future<Iterable<RegExpMatch>?> _getHTMLObjects(String relPath, RegExp reContainer, RegExp reObjects) async {
var page = await NetService.getRaw(_baseUrl + relPath)
.whenComplete(() => print('Page done.\n'));
if (page != null) {
final objectsPane = reContainer.firstMatch(page)!.group(0);
if (objectsPane != null) {
return Future.value(reObjects.allMatches(objectsPane));
}
}
return null;
}
}
void main(List<String> args) async {
await Yongwon.fetchImages();
print('\nJob done!');
}
Netservice (partial code):
class NetService {
static Future<String?> getRaw(String url, {int okCode = 200}) {
return http.get(Uri.parse(url))
.then((response) {
if (response.statusCode == okCode) {
return response.body;
}
PrintService.showDataNotOK(response);
return null;
})
.catchError((err) => PrintService.showError(err));
}
}
Result:
Page done.
http://yongwon-h.gne.go.kr/upload/bbs/files/2021/hgschl/yongwon-h/ntt/62865/ntt_85189591/thumb/thumb_img_9028b523-7bfb-466f-848c-65870a93b99c1616411595463.jpg
http://yongwon-h.gne.go.kr/upload/bbs/files/2021/hgschl/yongwon-h/ntt/62865/ntt_85169237/thumb/thumb_img_0fe7d01b-6941-4468-8623-088af971fbf21616047569744.jpg
http://yongwon-h.gne.go.kr/upload/bbs/files/2021/hgschl/yongwon-h/ntt/62865/ntt_85148970/thumb/thumb_img_67ae1c34-cd49-4af4-8a68-cacec672c84d1615859096270.jpg
http://yongwon-h.gne.go.kr/upload/bbs/files/2021/hgschl/yongwon-h/ntt/62865/ntt_85041266/thumb/thumb_img_ddc5097b-ae4e-4190-b0b8-1aa88cf78e491614223854604.jpg
http://yongwon-h.gne.go.kr/upload/bbs/files/2021/hgschl/yongwon-h/ntt/62865/ntt_85039068/thumb/thumb_img_f5c77ec4-a448-44b0-b5b1-61079be18eb61614145925749.jpg
http://yongwon-h.gne.go.kr/upload/bbs/files/2021/hgschl/yongwon-h/ntt/62865/ntt_85002051/thumb/thumb_img_0df44e4d-9872-4605-a94f-32b3004bc42a1612331543446.jpg
http://yongwon-h.gne.go.kr/upload/bbs/files/2021/hgschl/yongwon-h/ntt/62865/ntt_84955511/thumb/thumb_img_de1fc864-2689-4917-85bc-b5d714040b1f1610248949513.jpg
http://yongwon-h.gne.go.kr/upload/bbs/files/2021/hgschl/yongwon-h/ntt/62865/ntt_84950100/thumb/thumb_img_cd3270ee-7bd0-4601-81fc-2de446903e281609919353000.jpg
http://yongwon-h.gne.go.kr/upload/bbs/files/2021/hgschl/yongwon-h/ntt/62865/ntt_84950096/thumb/thumb_img_0eee718a-a2de-4182-a0d9-f97de17d98741609919173296.jpg
Job done!