我们需要为一个android项目拍摄《国家地理杂志》当天的照片。我们正在使用jsoup来完成这项工作，它正在为我们试图获取的其他站点和照片工作，但这次不行。
http://www.nationalgeographic.com/photography/photo-of-the-day
这是我们需要的照片的链接。如果您检查页面，您将看到包含链接的元素有多个不同大小的照片链接。所以我们怀疑这就是问题所在。以下是包含所有链接的元素：
<source srcset="http://yourshot.nationalgeographic.com/u/fQYSUbVfts-T7odkrFJckdiFeHvab0GWOfzhj7tYdC0uglagsDq-TNIRQ3qELJppd8ZLNRvnhakVub3VQlC2V5_yAGtyNoIAtaUObf5sBn_PGVEIlVVcerfj6l1ovYy2W4h7lMAkEVLdiCZKr9S9wuwge1myLnbvmEvxjeQ-HOfdmgprhGjqn4pNtAwmKvwU6FOW3O0jR-t4LlattRw52wBmvg/ 240w, http://yourshot.nationalgeographic.com/u/fQYSUbVfts-T7odkrFJckdiFeHvab0GWOfzhj7tYdC0uglagsDq-TNIRQ3qELJppd8ZLNRvnhakVub3VQlC2V5_yAGtyNoIAtaUObf5sBn_PGVEIlVVcerfj6l1ovYy2W4h7lMAkEVLdiCZKr9S9wuwge1myLnbvmEvxjeQ-HOfdmgprhGjqn4pNtAwmKvwU6cKxp_v-TRYywK8kMonNsWFMiA/ 320w, http://yourshot.nationalgeographic.com/u/fQYSUbVfts-T7odkrFJckdiFeHvab0GWOfzhj7tYdC0uglagsDq-TNIRQ3qELJppd8ZLNRvnhakVub3VQlC2V5_yAGtyNoIAtaUObf5sBn_PGVEIlVVcerfj6l1ovYy2W4h7lMAkEVLdiCZKr9S9wuwge1myLnbvmEvxjeQ-HOfdmgprhGjqn4pNtAwmKvwU76IwFM89MgsU2CsVpABa94yrwg/ 500w, http://yourshot.nationalgeographic.com/u/fQYSUbVfts-T7odkrFJckdiFeHvab0GWOfzhj7tYdC0uglagsDq-TNIRQ3qELJppd8ZLNRvnhakVub3VQlC2V5_yAGtyNoIAtaUObf5sBn_PGVEIlVVcerfj6l1ovYy2W4h7lMAkEVLdiCZKr9S9wuwge1myLnbvmEvxjeQ-HOfdmgprhGjqn4pNtAwmKvwU7Lx-mjq8_Dk9iI7H4kcoPo-SmA/ 640w, http://yourshot.nationalgeographic.com/u/fQYSUbVfts-T7odkrFJckdiFeHvab0GWOfzhj7tYdC0uglagsDq-TNIRQ3qELJppd8ZLNRvnhakVub3VQlC2V5_yAGtyNoIAtaUObf5sBn_PGVEIlVVcerfj6l1ovYy2W4h7lMAkEVLdiCZKr9S9wuwge1myLnbvmEvxjeQ-HOfdmgprhGjqn4pNtAwmKvwU4kJMUl3WmTvlAFqfo4wIlDssvw/ 800w, http://yourshot.nationalgeographic.com/u/fQYSUbVfts-T7odkrFJckdiFeHvab0GWOfzhj7tYdC0uglagsDq-TNIRQ3qELJppd8ZLNRvnhakVub3VQlC2V5_yAGtyNoIAtaUObf5sBn_PGVEIlVVcerfj6l1ovYy2W4h7lMAkEVLdiCZKr9S9wuwge1myLnbvmEvxjeQ-HOfdmgprhGjqn4pNtAwmKvwU6-HA9n31rVvmbG5touqPt59wY3s/ 1024w, http://yourshot.nationalgeographic.com/u/fQYSUbVfts-T7odkrFJckdiFeHvab0GWOfzhj7tYdC0uglagsDq-TNIRQ3qELJppd8ZLNRvnhakVub3VQlC2V5_yAGtyNoIAtaUObf5sBn_PGVEIlVVcerfj6l1ovYy2W4h7lMAkEVLdiCZKr9S9wuwge1myLnbvmEvxjeQ-HOfdmgprhGjqn4pNtAwmKvwU6-dIS7lLTB0CSOM4O0wlvLx9pDnb/ 1600w, http://yourshot.nationalgeographic.com/u/fQYSUbVfts-T7odkrFJckdiFeHvab0GWOfzhj7tYdC0uglagsDq-TNIRQ3qELJppd8ZLNRvnhakVub3VQlC2V5_yAGtyNoIAtaUObf5sBn_PGVEIlVVcerfj6l1ovYy2W4h7lMAkEVLdiCZKr9S9wuwge1myLnbvmEvxjeQ-HOfdmgprhGjqn4pNtAwmKvwU6FcgiBNz-Nj7_J7e61F6_8oUXwoV/ 2048w" sizes="730px" data-reactid=".5.0.1.0.0.$http=2//www=1nationalgeographic=1com/photography/photo-of-the-day/2017/01/boy-buffalo-thailand.0.0.0.0.0.0.0.0">
如您所见，有多个链接，因此我们也尝试拆分代码并只获取其中一个链接，但是jsoup似乎一开始就没有获得任何代码。
代码如下：
Document doc = Jsoup.connect("http://www.nationalgeographic.com/photography/photo-of-the-day").get();
Elements img = doc.select("div.modules-images__placeholder source[srcset]");
imgSrc = img.attr("srcset"); //srcset
String[] splitStr = imgSrc.split("\\s+");
int n = splitStr.length;
imgSrc = splitStr[n-2];
//Download Image from URL
InputStream input = new java.net.URL(imgSrc).openStream();
//Decode Bitmap
bitmap = BitmapFactory.decodeStream(input);
myWallpaperManager.setBitmap(bitmap);
最佳答案
我有办法了。
另外，如果您想要获得不同的大小，只需将0更改为另一个索引，它就会工作：
String imgSrc = img.attr("srcset").split(",")[0].replaceAll(" \\d+w", "");
目前正在返回
http://yourshot.nationalgeographic.com/u/fQYSUbVfts-T7odkrFJckdiFeHvab0GWOfzhj7tYdC0uglagsDq-TNIRQ3qELJppd8ZLNRvnhakVub3VQlC2V5_yAGtyNoIAtaUObf5sBn_PGVEIlVVcerfj6l1ovYy2W4h7lMAkEVLdiCZKr9S9wuwge1myLnbvmEvxjeQ-HOfdmgprhGjqn4pNtAwmKvwU6FOW3O0jR-t4LlattRw52wBmvg/。编辑：
如果您能正确地获得srcset属性，它就会工作。出于某种原因，jsoup没有得到它。