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Jsoup：如何获取2个标题标签之间的所有html

发布于 2024-11-18 09:22:01 字数 100 浏览 0 评论 0原文

我正在尝试获取 2 个 h1 标签之间的所有 html。实际任务是根据 h1（标题 1）标签将 html 分成框架（章节）。

感谢任何帮助。

谢谢苏尼尔

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风渺 2024-11-25 09:22:01

如果您想获取并处理两个连续 h1 标记之间的所有元素，您可以处理同级标记。这是一些示例代码：

public static void h1s() {
  String html = "<html>" +
  "<head></head>" +
  "<body>" +
  "  <h1>title 1</h1>" +
  "  <p>hello 1</p>" +
  "  <table>" +
  "    <tr>" +
  "      <td>hello</td>" +
  "      <td>world</td>" +
  "      <td>1</td>" +
  "    </tr>" +
  "  </table>" +
  "  <h1>title 2</h1>" +
  "  <p>hello 2</p>" +
  "  <table>" +
  "    <tr>" +
  "      <td>hello</td>" +
  "      <td>world</td>" +
  "      <td>2</td>" +
  "    </tr>" +
  "  </table>" +
  "  <h1>title 3</h1>" +
  "  <p>hello 3</p>" +
  "  <table>" +
  "    <tr>" +
  "      <td>hello</td>" +
  "      <td>world</td>" +
  "      <td>3</td>" +
  "    </tr>" +
  "  </table>" +    
  "</body>" +
  "</html>";
  Document doc = Jsoup.parse(html);
  Element firstH1 = doc.select("h1").first();
  Elements siblings = firstH1.siblingElements();
  List<Element> elementsBetween = new ArrayList<Element>();
  for (int i = 1; i < siblings.size(); i++) {
    Element sibling = siblings.get(i);
    if (! "h1".equals(sibling.tagName()))
      elementsBetween.add(sibling);
    else {
      processElementsBetween(elementsBetween);
      elementsBetween.clear();
    }
  }
  if (! elementsBetween.isEmpty())
    processElementsBetween(elementsBetween);
}

private static void processElementsBetween(
    List<Element> elementsBetween) {
  System.out.println("---");
  for (Element element : elementsBetween) {
    System.out.println(element);
  }
}

If you want to get and process all elements between two consecutive h1 tags you can work on siblings. Here's some example code:

public static void h1s() {
  String html = "<html>" +
  "<head></head>" +
  "<body>" +
  "  <h1>title 1</h1>" +
  "  <p>hello 1</p>" +
  "  <table>" +
  "    <tr>" +
  "      <td>hello</td>" +
  "      <td>world</td>" +
  "      <td>1</td>" +
  "    </tr>" +
  "  </table>" +
  "  <h1>title 2</h1>" +
  "  <p>hello 2</p>" +
  "  <table>" +
  "    <tr>" +
  "      <td>hello</td>" +
  "      <td>world</td>" +
  "      <td>2</td>" +
  "    </tr>" +
  "  </table>" +
  "  <h1>title 3</h1>" +
  "  <p>hello 3</p>" +
  "  <table>" +
  "    <tr>" +
  "      <td>hello</td>" +
  "      <td>world</td>" +
  "      <td>3</td>" +
  "    </tr>" +
  "  </table>" +    
  "</body>" +
  "</html>";
  Document doc = Jsoup.parse(html);
  Element firstH1 = doc.select("h1").first();
  Elements siblings = firstH1.siblingElements();
  List<Element> elementsBetween = new ArrayList<Element>();
  for (int i = 1; i < siblings.size(); i++) {
    Element sibling = siblings.get(i);
    if (! "h1".equals(sibling.tagName()))
      elementsBetween.add(sibling);
    else {
      processElementsBetween(elementsBetween);
      elementsBetween.clear();
    }
  }
  if (! elementsBetween.isEmpty())
    processElementsBetween(elementsBetween);
}

private static void processElementsBetween(
    List<Element> elementsBetween) {
  System.out.println("---");
  for (Element element : elementsBetween) {
    System.out.println(element);
  }
}

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遇见了你 2024-11-25 09:22:01

我不太了解 Jsoup，但直接的方法可能如下所示：

public class Test {

    public static void main(String[] args){

        Document document = Jsoup.parse("<html><body>" +
            "<h1>First</h1><p>text text text</p>" +
            "<h1>Second</h1>more text" +
            "</body></html>");

        List<List<Node>> articles = new ArrayList<List<Node>>();
        List<Node> currentArticle = null;

        for(Node node : document.getElementsByTag("body").get(0).childNodes()){
            if(node.outerHtml().startsWith("<h1>")){
                currentArticle = new ArrayList<Node>();
                articles.add(currentArticle);
            }

            currentArticle.add(node);
        }

        for(List<Node> article : articles){
            for(Node node : article){
                System.out.println(node);
            }
            System.out.println("------- new page ---------");
        }

    }

}

您知道文章的结构吗？它总是相同的吗？您想对这些文章做什么？您是否考虑过在客户端拆分它们？这将是一个简单的 jQuery 工作。

I don't know Jsoup that good, but a straight forward approach could look like this:

public class Test {

    public static void main(String[] args){

        Document document = Jsoup.parse("<html><body>" +
            "<h1>First</h1><p>text text text</p>" +
            "<h1>Second</h1>more text" +
            "</body></html>");

        List<List<Node>> articles = new ArrayList<List<Node>>();
        List<Node> currentArticle = null;

        for(Node node : document.getElementsByTag("body").get(0).childNodes()){
            if(node.outerHtml().startsWith("<h1>")){
                currentArticle = new ArrayList<Node>();
                articles.add(currentArticle);
            }

            currentArticle.add(node);
        }

        for(List<Node> article : articles){
            for(Node node : article){
                System.out.println(node);
            }
            System.out.println("------- new page ---------");
        }

    }

}

Do you know the structure of the articles and is it always the same? What do you want to do with the articles? Have you considered splitting them on the client side? This would be an easy jQuery Job.

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明月松间行 2024-11-25 09:22:01

迭代连续元素之间的元素似乎没问题，除了一件事。不属于任何标签的文本，如

this

中。为了解决这个问题，我实现了 splitElemText 函数来获取此文本。首先使用此方法拆分整个父元素。然后，除了元素之外，从分割的文本中处理合适的条目。如果您想要原始 html，请删除对 `htmlToText` 的调用。

/** Splits the text of the element <code>elem</code> by the children
  * tags.
  * @return An array of size <code>c+1</code>, where <copde>c</code>
  * is the number of child elements.
  * <p>Text after <code>n</code>th element is found in <code>[n+1]</code>.
  */
public static String[] splitElemText(Element elem)
{
  int c = elem.children().size();
  String as[] = new String[c + 1];
  String sAll = elem.html();
  int iBeg = 0;
  int iChild = 0;
  for (Element ch : elem.children()) {
    String sChild = ch.outerHtml();
    int iEnd = sAll.indexOf(sChild, iBeg);
    if (iEnd < 0) { throw new RuntimeException("Tag " + sChild
                    +" not found in its parent: " + sAll);
    }
    as[iChild] = htmlToText(sAll.substring(iBeg, iEnd));
    iBeg = iEnd + sChild.length();
    iChild += 1;
  }
  as[iChild] = htmlToText(sAll.substring(iBeg));
  assert(iChild == c);
  return as;
}

public static String htmlToText(String sHtml)
{
  Document doc = Jsoup.parse(sHtml);
  return doc.text();
}

Iterating over the elements between consecutive <h> elements seems to be fine, except one thing. Text not belonging to any tag, like in <h1/>this<h1/>. To workaround this I implemented splitElemText function to get this text. First split whole parent element using this method. Then except the element, process the suitable entry from the splitted text. Remove calls to htmlToText if you want raw html.

/** Splits the text of the element <code>elem</code> by the children
  * tags.
  * @return An array of size <code>c+1</code>, where <copde>c</code>
  * is the number of child elements.
  * <p>Text after <code>n</code>th element is found in <code>[n+1]</code>.
  */
public static String[] splitElemText(Element elem)
{
  int c = elem.children().size();
  String as[] = new String[c + 1];
  String sAll = elem.html();
  int iBeg = 0;
  int iChild = 0;
  for (Element ch : elem.children()) {
    String sChild = ch.outerHtml();
    int iEnd = sAll.indexOf(sChild, iBeg);
    if (iEnd < 0) { throw new RuntimeException("Tag " + sChild
                    +" not found in its parent: " + sAll);
    }
    as[iChild] = htmlToText(sAll.substring(iBeg, iEnd));
    iBeg = iEnd + sChild.length();
    iChild += 1;
  }
  as[iChild] = htmlToText(sAll.substring(iBeg));
  assert(iChild == c);
  return as;
}

public static String htmlToText(String sHtml)
{
  Document doc = Jsoup.parse(sHtml);
  return doc.text();
}

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