Flutter 通过使用dart/FLATTER从谷歌抓取图像获得[]
您好，我想从谷歌抓取图像，但我得到[]作为列表的结果，我无法找出它，请参阅下面的代码 主要方法Flutter 通过使用dart/FLATTER从谷歌抓取图像获得[],flutter,dart,web-scraping,Flutter,Dart,Web Scraping,您好，我想从谷歌抓取图像，但我得到[]作为列表的结果，我无法找出它，请参阅下面的代码 主要方法 void main(List<String> arguments) async { print('Hello world: ${web_scrapping.calculate()}!'); await getImageByDom('hyderabad'); print(imageList); } getImageByDom应该返回一个列表，而不是void 导入'dart:a
void main(List<String> arguments) async {
print('Hello world: ${web_scrapping.calculate()}!');
await getImageByDom('hyderabad');
print(imageList);
}
getImageByDom列表，而不是void
导入'dart:async'；
导入“dart:io”；
将“package:http/http.dart”导入为http；
导入“package:html/parser.dart”显示解析；
导入“package:html/dom.dart”；
Future main（）异步{
List imageList=等待getImageByDom（'hyderabad'）；
打印（图像列表）；
}
未来getImageByDom（字符串城市）异步{
最终映射头={
HttpHeaders.userAgentHeader：
'Mozilla/5.0（Macintosh；英特尔Mac OS X 10_12_6）AppleWebKit/537.36（KHTML，类似Gecko）Chrome/80.0.3987.122 Safari/537.36'
};
最终响应=等待http.get(
'https://www.google.com.pk/search?q=$city+city&tbm=isch&ved=2ahUKEwiK5_jmqt_uAhWE4oUKHSH-DRYQ2-cCegQIABAA'，
标题：标题）；
if（response.statusCode！=HttpStatus.ok）{
返回[]；
}
var document=parse（response.body）；
final元素=wait document.queryselectoral（'.bRMDJf'）；
返回elements.map（（a）=>a.querySelector（'img'）.attributes['src']）.toList（）；
}
输出
[data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null]
Title: New Study Says 25 Cups Is Fine ...fortune.com
Thumbnail: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSEQHSv8xWAiRTaXUcY0VbPy2BecsEZ2KpsPQ&usqp=CAU
Title: Positive and Negative Effects of Caffeineaarp.org
Thumbnail: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQzN08BEkD0a2Gl7D1vyFUo-jHmhIvlH9FUXQ&usqp=CAU
Title: How is Coffee Decaffeinated?cafedirect.co.uk
Thumbnail: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcT6Tcm59kufV9EkMEOkf9JErWrj0tSMwOCAIA&usqp=CAU
Title: Colombian Coffee Buzz: What's So Great ...ictcoffee.com
Thumbnail: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQGOKd6N93WdEzpuxpopFJlCXZFqK7YBHofiA&usqp=CAU
Stripped...
但它提取1x1占位符图像是因为
- 谷歌通过
\u defd
JS函数注入部分rg_元标记。您需要提取并解码它的参数
- 谷歌图片也直接以HTML标记的形式包含图片，而不是.rg_meta。您可以像解析普通HTML标记一样解析它们
谷歌JS代码的一部分来自谷歌图片，注入标签。第一个参数defd1是要替换为内容的占位符HTML元素的ID。第二个参数是编码的HTML字符串
\u defd（defd1，，，，，，\x3 CDCD4 4行动\x3 D\x3 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3\x22 jsmodel\x3d\x22uZbpBf sB4qxc\x22 jsdata\x3d\x22j0Opre；9pyRez7A01yLeM；27\x22样式\x3d\x22width:283px；\x22数据tbnid\x3d\x229pyRez7A01yLeM\x22数据ct\x3d\x220\x22数据cb\x3d\x220\x22数据cl\x3d\x220\x22数据cr\x3d\x223\x22数据tw\x3d\x22数据tw\x22\x22数据ow\x3d\X221\X210\X22OH\X221\X221\X219数据类\x22 jsname\x3d\x22sTFXNd\x22 jsaction\x3d\x22点击：J9iaEb；\x22 jsaction\x3d\x22鼠标下载：npT2md；触摸启动：npT2md；\x22数据导航\x3d\x221\x22选项卡索引\x3d\x220\x22样式\x3d\x22高度：164px；\x22\x3e\x3cdiv类\x3d\x22bRMDJf islir\x22 jsname\x3d\x22样式\X2D\X22DEYS22背景：rgb（200194）宽度：292px；高度：164px；左边距：0px；右边距：-9px；\x22 jsaction\x3d\x22mousedown:npT2md；touchstart:npT2md；\x22\x3e\x3cimg class\x3d\x22rg\x4LUWD tx8vtf\x22数据src\x3d\x22https:\/\/加密的-tbn0.gstatic.com\/images\q\x37dtbn%牙买加咖啡公司为迎合美国市场制定计划-OEC…\x22\/\x3e\x3c\/div\x3e\x3c\/div\x3e\x3cdiv class\x3d\x22c7cjWc\x22\x3e\x3c\/div\x3e\x3e\x3c\/div\x3e\x3e\x3c\/x3e\x2e\x2e\x3cdiv class\x3d\x22d\x22PiLIec\x22 jsaction\x3d\x22\x22点击：gFs2Re\x22\x2e\x3e\x3e\x3c\/x3c\/div\x3c\/div\x3c\/div4kDegQIARBZ\x22 jsname\x3d\x22uy6ald\x22 rel\x3d\x22oopener\x22 target\x3d\x22 blank\x22 href\x3d\x22http:\/\/oecsbusinessfocus.com\/牙买加咖啡公司制定计划吸引美国市场\/\x22 jsaction\x3d\x22focus:kvvb；mousedown:kvvb；touchtstart:kvvb；\x22\x3e\x3e\x3e\x3cdiv class\x3d\x22smic\x3e\x24lnqe\x32\x32牙买加咖啡公司制定计划…\x3c\/div\x3e\x3cdiv class\x3d\x22fxgdke\x22\x3eoecsbusinessfocus.com\x3c\/div\x3e\x3c\/div\x3e\x3c\/a\x3e\x3c\/div\x3e'）
或者，你也可以通过SerpApi获取图像。这是一个付费API，免费试用
导入'dart:async'；
导入“dart:convert”；
导入“dart:io”展示平台，HttpStatus；
将“package:http/http.dart”导入为http；
Future main（）异步{
Map envVars=Platform.environment；
final uri=uri.https（'serpapi.com'，'/search'{
‘q’：‘咖啡’，
“谷歌域名”：“google.com.pk”，
‘gl’：‘pk’，
“tbm”：“isch”，
“api_键”：envVars['api_键]，
});
最终响应=等待http.get（uri）；
最终convertedResponse=jsonDecode（response.body）；
对于（convertedResponse['images_results']中的最终图像结果）{
打印（“”）
标题：${imageResult['Title']}
缩略图：${imageResult['Thumbnail']}
""");
}
}
输出
[data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null]
Title: New Study Says 25 Cups Is Fine ...fortune.com
Thumbnail: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSEQHSv8xWAiRTaXUcY0VbPy2BecsEZ2KpsPQ&usqp=CAU
Title: Positive and Negative Effects of Caffeineaarp.org
Thumbnail: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQzN08BEkD0a2Gl7D1vyFUo-jHmhIvlH9FUXQ&usqp=CAU
Title: How is Coffee Decaffeinated?cafedirect.co.uk
Thumbnail: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcT6Tcm59kufV9EkMEOkf9JErWrj0tSMwOCAIA&usqp=CAU
Title: Colombian Coffee Buzz: What's So Great ...ictcoffee.com
Thumbnail: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQGOKd6N93WdEzpuxpopFJlCXZFqK7YBHofiA&usqp=CAU
Stripped...
披露：我在SerpApi工作