我试图通过它的课程得到一个特定的div。该类实际上包含多个用空格分隔的类，但是：最后一个类分隔为空格！
Ex：class = test [SPACE] test [SPACE] test [SPACE] [SPACE] test
完整：
列表[SPACE] category_templates [SPACE] clearfix [SPACE] shelfListing [SPACE] [SPACE] multiSaveListing
现在我是如何继续这样做的？
无法正常工作（无错误）：
Elements divItemContainer = doc.select("div[class=listing category_templates clearfix shelfListing multiSaveListing]");
for (Element div : divItemContainer) {
Toast.makeText(ApplicationContextProvider.getContext(), "Got Div: ", Toast.LENGTH_SHORT).show();
}
无效（抛出错误：字符串不能包含空格）：
Elements divItemContainer = doc.select("div.listing.category_templates.clearfix.shelfListing..multiSaveListing");
for (Element div : divItemContainer) {
Toast.makeText(ApplicationContextProvider.getContext(), "Got Div: ", Toast.LENGTH_SHORT).show();
}
无效（无错误）：
Elements divItemContainer = doc.select("div.listing.category_templates.clearfix.shelfListing.multiSaveListing");
for (Element div : divItemContainer) {
Toast.makeText(ApplicationContextProvider.getContext(), "Got Div: ", Toast.LENGTH_SHORT).show();
}
<div class="listing category_templates clearfix shelfListing multiSaveListing"><div id="yousaveImage"></div><div class="multisave" id="multiSaveId"><a class="linksave" href="/promotion/2-for-250/ls85559"><span class="view-all">View all</span><span class="offer-2for3">2 for</span><span><span class="poundSign"></span><span class="ping-offer-finalValue">£2.50</span><span class="ping-offer-finalValue-1" style="display:none"></span><span class="pencep" style="display:none">p</span></span></a></div><div class="container"><div class="slider category_templates"><input id="itemId" value="1000000476716" type="hidden"><input id="maxQtyId" value="24.0" type="hidden"><div class="product active"><div class="slider"><div class="information active"><div class="imgContainer"><a href="/product/no-added-sugar/asda-chosen-by-you-orange-pineapple-double-strength-squash/1000000476716"><img class="" src="http://ui2.assets-asda.com:80/g/v5/501/375/5051413501375_130_IDShot_4.jpeg" data-original="http://ui2.assets-asda.com:80/g/v5/501/375/5051413501375_130_IDShot_4.jpeg" alt="ASDA Chosen By You Orange & Pineapple Double Strength Squash 2 FOR £2.50" title="" onerror="loadNoImage(this)"></a><a href="#" id="addToShoppingList" class="shoppinglist-icon icon-addto" title="Add to shopping list" aria-haspopup="true" aria-expanded="false"><span class="accessible"> Add to shopping list</span></a></div><p class="bundle-contains" style="display:none;"> Contains <span>0</span> <span>items</span></p><p class="subTitle">1.5LT</p></div></div><div class="product-content"><span class="bundle-banner" style="display:none;"> Bundle </span><span class="promoBanner"></span><span class="primaryBanner" style="display:none;"><a href="/promotion/2-for-250/ls85559" title="2 FOR £2.50">2 FOR £2.50</a></span><span class="title" id="productTitle"><a role="presentation" aria-hidden="true" tabindex="-1" href="/product/no-added-sugar/asda-chosen-by-you-orange-pineapple-double-strength-squash/1000000476716" title="ASDA Chosen By You Orange & Pineapple Double Strength Squash"><span>ASDA Chosen By You Orange & Pineapple Double Strength Squash</span></a></span><div class="product-type-icons" style="visibility:visible"><i data-contentid="" data-similarproducts="true" data-title="Suitable for Vegetarians" data-name="Suitable for Vegetarians" title="Vegetarian" class="type-icon icon-suitable-for-vegetarians" data-infoiconid="1215398078196" data-id="2854136"><a href="#" class="icons">Vegetarian</a></i></div><div class="rating-static rating-50"><span class="star star1"></span><span class="star star2"></span><span class="star star3"></span><span class="star star4"></span><span class="star star5"></span></div><div class="prod-limit-Mask"></div><div class="quantity-info-Mask"><span class="qLimit-toolTip"></span><a href="#" class="undoLimit-close" role="alertdialog" aria-labelledby="quantityLimitText"> Close </a><div class="qLimit-popUp"><p id="quantityLimitText"><span class="qLimit-Sorry">Sorry...</span>You can't add more than <span class="max-qty-val">24</span> per order</p></div></div><div id="cartBground" class="addedbg"><div class="price-cart-block"><div class="price-wrap category_templates"><span class="price"><span>£1.40</span></span><span class="priceInformation"> (9.3p/100ml) </span></div><a href="#" onclick="return false;" class="btn btn-primary addItemToTrolley fav-test-item " data-skuid="1000000476716">Add</a><a href="/product/no-added-sugar/asda-chosen-by-you-orange-pineapple-double-strength-squash/1000000476716" class="view-bundle btn btn-primary fav-bundle-test-item" style="display:none;" data-skuid="1000000476716">View bundle</a><div class="quantityOptions clearfix"><a href="#" onclick="return false;" id="minusButtonId" onselectstart="return false;" aria-label="Quantity Decrease" class="btn btn-primary button-quantity quantityDecrease"><span>–</span></a><input aria-label="Quantity in your trolley" value="1" name="quantityInTrolley" class="prd-txt" maxlength="5" type="number"><a href="#" onclick="return false;" id="plusButtonId" onselectstart="return false;" aria-label="Quantity Increase" class="btn btn-primary button-quantity quantityIncrease"><span>+</span></a><a href="#" onclick="return false;" class="btn btn-primary add-small" style="display:none;" id="applyItemToTrolley">Add</a><div id="qtySelect" class="qty-wrapper" style="display: none;"><div class="qty-select"><span class="qty-value" tabindex="0" title="Quantity">Q<span class="accessible">uanti</span>ty</span><span class="qty-select-icon"></span></div><ul class="qty-list" style="display:none"><li class="qtyAccessible"><span title="Quantity" data-salesunit="Qty">Q<span class="accessible">uanti</span>ty</span></li><li class="kgAccessible"><span title="Kilogram" data-salesunit="kg">k<span class="accessible">ilo</span>g<span class="accessible">ram</span></span></li></ul></div><p id="inTrolleyId">in your trolley</p></div></div><div id="itemAjaxLoader" class="ajaxLoader 1000000476716" style="display:none;"><img src="//ui3.assets-asda.com/theme/img/common/loader.svg" style="width: 32px;" onerror="this.src=//ui3.assets-asda.com/theme/img/common/ajax-loader.gif; this.onerror=null;"></div><div class="unavail-item-message"> Item unavailable<span class="qLimit-toolTip"></span></div><div class="unavail-item"><span class="unavailable-image"></span><span></span></div></div></div><div class="sectionMenu"></div></div></div></div></div>
答案 0 :(得分：1)
这有效，但它不安全，没有理由使用它。此外，为了使您能够工作，类和空格的顺序必须相同。你说它没有，但我已经测试了它，它确实如此。
Elements divItemContainer = doc.select("div[class=listing category_templates clearfix shelfListing multiSaveListing]");
for (Element div : divItemContainer) {
Toast.makeText(ApplicationContextProvider.getContext(), "Got Div: ", Toast.LENGTH_SHORT).show();
}
这是做到这一点的方法。类的顺序并不重要，也不是空格。你说它不起作用，但我已经对它进行了测试，确实如此。
Elements divItemContainer = doc.select("div.listing.category_templates.clearfix.shelfListing.multiSaveListing");
for (Element div : divItemContainer) {
Toast.makeText(ApplicationContextProvider.getContext(), "Got Div: ", Toast.LENGTH_SHORT).show();
}
对于这个错误是正确的。
Elements divItemContainer = doc.select("div.listing.category_templates.clearfix.shelfListing..multiSaveListing");
for (Element div : divItemContainer) {
Toast.makeText(ApplicationContextProvider.getContext(), "Got Div: ", Toast.LENGTH_SHORT).show();
}
您的查询在执行之前会经过验证。发生的验证将您输入的每个类作为参数。您输入的css选择器会针对每个.进行拆分，并且通过键入连续的.，您将创建空类。
public static void notEmpty(String string) {
if ((string == null) || (string.length() == 0))
throw new IllegalArgumentException("String must not be empty");
}
它不起作用的原因不是你的选择者。尝试键入从服务器获得的响应。当您Document doc = Jsoup.parse()...尝试打印doc时。这是否包含您要搜索的元素？我怀疑它没有。
如果我正确地说你正在寻找的元素不在你得到的答案中，那么你有两种可能性。
bot并且不允许该程序或它为您提供移动设备页面，因此它可以为您提供浏览浏览器时所看到的内容。如果是这种情况，则解决方案是设置userAgent