Java jsoup-如何选择特定h3（也有id和span类）后面段落中的所有链接

我试图让所有的链接更加精确，只要链接的文本在标题关系下，就可以实例化

<h2><span class="mw-headline" id="Relations">Relations</span></h2>
<h3><span class="mw-headline" id="Can_Instantiate">Can Instantiate</span></h3>
<p><a href="/index.php/Attention_Demanding_Gameplay" title="Attention Demanding Gameplay">Attention Demanding Gameplay</a>, 
<a href="/index.php?title=Conflicts&amp;action=edit&amp;redlink=1" class="new" title="Conflicts (page does not exist)">Conflicts</a>, 
<a href="/index.php/Continuous_Goals" title="Continuous Goals">Continuous Goals</a>, 
<a href="/index.php?title=Ownership&amp;action=edit&amp;redlink=1" class="new" title="Ownership (page does not exist)">Ownership</a>, 
<a href="/index.php/Preventing_Goals" title="Preventing Goals">Preventing Goals</a>, 
<a href="/index.php/Reconnaissance" title="Reconnaissance">Reconnaissance</a>, 
<a href="/index.php/Stimulated_Planning" title="Stimulated Planning">Stimulated Planning</a>, 
<a href="/index.php/Trade-Offs" title="Trade-Offs">Trade-Offs</a>
</p>

---

但两者都不起作用，我在这里有点不知所措。有人能帮我吗？

您选择h3，而h3没有任何a标签。我认为您必须选择p标签

Jsoup下一个同级API将帮助您。您需要选择

<h2><span class="mw-headline" id="Relations">Relations</span></h2> 

这将迭代到下一个兄弟

你可以在

上阅读，试试这个，这对我有用 代码：

输出：

Attention Demanding Gameplay, Conflicts, Continuous Goals, Ownership, Preventing Goals, Reconnaissance, Stimulated Planning, Trade-Offs
Attention Demanding Gameplay
Conflicts
Continuous Goals
Ownership
Preventing Goals
Reconnaissance
Stimulated Planning
Trade-Offs

使用此CSS选择器：

#mw-content-text > p:nth-child(18) > a

下面是获取标题文本的代码片段

import java.io.IOException;
import java.util.List;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;

public class Test {

    public static void main(String[] args) {

        try {

            Document doc = Jsoup.connect("http://virt10.itu.chalmers.se/index.php/Guard").get();
            List<String> titles = doc.select("#mw-content-text > p:nth-child(18) > a").eachText();

            for (String title : titles) {
                System.out.println(title);
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

---

单击以快速查看。

但是如果我选择p标记，我如何确保在标题关系下仅选择p？选择p的父级我认为这很容易，然后选择第一个子级，在这种情况下，你会发现代码获取p的父级的想法很简单？因此我的选择器将是元素contentinstantiate=doc.selectspan.mw-headlineRelations，h2；但是为了得到下一个兄弟，我必须使用nextElementsibling或？这将为您提供一个H2元素数组。现在，对于每个元素，您可以调用nextsibling，它将为您提供H3元素。下一个兄弟姐妹会再次给你标签。非常感谢是否不可能只获取id为Can_实例化的span class mw headline？我的亲戚们似乎没那么做。是的，你可以做到。按Id获取Can_实例化的元素。使用.parent方法获取它的父对象，然后选择nextElementSibling，它将为您提供标记。

public Node nextSibling​()

final String url = "http://virt10.itu.chalmers.se/index.php/Guard";
         Document doc = Jsoup.connect(url).get();
         Element contentinstantiate = doc.getElementById("Can_Instantiate").parent().nextElementSibling();
         for(Element e : contentinstantiate.getAllElements()){
             System.out.println(e.text());
         }

Attention Demanding Gameplay, Conflicts, Continuous Goals, Ownership, Preventing Goals, Reconnaissance, Stimulated Planning, Trade-Offs
Attention Demanding Gameplay
Conflicts
Continuous Goals
Ownership
Preventing Goals
Reconnaissance
Stimulated Planning
Trade-Offs

import java.io.IOException;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

public class StackOverflow50897294 {
    public static void main(String[] args) throws IOException {
        Document doc = Jsoup.connect("http://virt10.itu.chalmers.se/index.php/Guard").get();
        Elements links = doc.selectFirst("h3 > span[id=\"Can_Instantiate\"]").parent().nextElementSibling().select("a");
        for (Element link : links) {
            System.out.println(link.text());
        }
    }
}

#mw-content-text > p:nth-child(18) > a

import java.io.IOException;
import java.util.List;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;

public class Test {

    public static void main(String[] args) {

        try {

            Document doc = Jsoup.connect("http://virt10.itu.chalmers.se/index.php/Guard").get();
            List<String> titles = doc.select("#mw-content-text > p:nth-child(18) > a").eachText();

            for (String title : titles) {
                System.out.println(title);
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}