Jsoup:对元素进行排序

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问题描述

我需要按其ownText()对Jsoup Elements容器进行排序.建议采用什么方法来实现这一目标?

I need to sort a Jsoup Elements container by its ownText(). What is a recommended way to accomplish that?

首先将其转换为ArrayList以便与自定义比较器一起使用有意义吗?

Does convertinng it to an ArrayList first for use with a custom comparator make sense?

顺便说一句，我尝试像在Collections.sort(anElementsList)中那样直接对其进行排序，但是编译器抱怨:

BTW, I tried sorting it directly, as in Collections.sort(anElementsList) but the compiler complains:

Bound mismatch: The generic method sort(List<T>) of type Collections is not applicable for
the arguments (Elements). The inferred type Element is not a valid substitute for the
bounded parameter <T extends Comparable<? super T>>

推荐答案

Jsoup Elements 已实现，它实际上是 List<Element> ，因此您根本不需要对其进行转换.您只需要编写自定义 Comparator<Element> 表示 Element ，因为它没有实现 Comparable<Element> (这就是为什么您看到此编译错误).

The Jsoup Elements already implements Collection, it's essentially a List<Element>, so you don't need to convert it at all. You just have to write a custom Comparator<Element> for Element because it doesn't implement Comparable<Element> (that's why you're seeing this compile error).

开球示例:

String html ="<p>one</p><p>two</p><p>three</p><p>four</p><p>five</p>";
Document document = Jsoup.parse(html);
Elements paragraphs = document.select("p");

Collections.sort(paragraphs, new Comparator<Element>() {
    @Override
    public int compare(Element e1, Element e2) {
        return e1.ownText().compareTo(e2.ownText());
    }
});

System.out.println(paragraphs);

结果:

<p>five</p>
<p>four</p>
<p>one</p>
<p>three</p>
<p>two</p>

另请参见:

根据姓名排序联系人的数组列表?
See also:
- Sorting an ArrayList of Contacts based on name?

ownText