如何在Java中解析HTML字符串？

Given the string "<table><tr><td>Hello World!</td></tr></table>", what is the (easiest) way to get a DOM Element representing it?

给定字符串“

Hello World! ”,获取DOM元素代表它的(最简单)方法是什么?

6 个解决方案

#1

Here's a way:

这是一种方式:

import java.io.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
import javax.swing.text.html.parser.*;

public class HtmlParseDemo {
   public static void main(String [] args) throws Exception {
       Reader reader = new StringReader("<table><tr><td>Hello</td><td>World!</td></tr></table>");
       HTMLEditorKit.Parser parser = new ParserDelegator();
       parser.parse(reader, new HTMLTableParser(), true);
       reader.close();
   }
}

class HTMLTableParser extends HTMLEditorKit.ParserCallback {

    private boolean encounteredATableRow = false;

    public void handleText(char[] data, int pos) {
        if(encounteredATableRow) System.out.println(new String(data));
    }

    public void handleStartTag(HTML.Tag t, MutableAttributeSet a, int pos) {
        if(t == HTML.Tag.TR) encounteredATableRow = true;
    }

    public void handleEndTag(HTML.Tag t, int pos) {
        if(t == HTML.Tag.TR) encounteredATableRow = false;
    }
}

#2

you could use HTML Parser, which a Java library used to parse HTML in either a linear or nested fashion. It is an open source tool and can be found on SourceForge

您可以使用HTML Parser,Java库用于以线性或嵌套方式解析HTML。它是一个开源工具,可以在SourceForge上找到

#3

If you have a string which contains HTML you can use Jsoup library like this to get HTML elements:

如果你有一个包含HTML的字符串,你可以像这样使用Jsoup库来获取HTML元素:

String htmlTable= "<table><tr><td>Hello World!</td></tr></table>";
Document doc = Jsoup.parse(htmlTable);

// then use something like this to get your element:
Elements tds = doc.getElementsByTag("td");

// tds will contain this one element: <td>Hello World!</td>

Good luck!

#4

You could use Swing:

你可以使用Swing:

How do you make use of the HTML-processing capabilities that are built into Java? You may not know that Swing contains all the classes necessary to parse HTML. Jeff Heaton shows you how.

如何利用Java内置的HTML处理功能?您可能不知道Swing包含解析HTML所需的所有类。杰夫希顿告诉你如何。

#5

I've used Jericho HTML Parser it's OSS, detects(forgives) badly formatted tags and is lightweight

我使用了Jericho HTML Parser它的OSS,检测(原谅)格式错误的标签并且是轻量级的

#6

I found this somewhere (don't remember where):

我发现这个地方(不记得在哪里):

 public static DocumentFragment parseXml(Document doc, String fragment)
 {
    // Wrap the fragment in an arbitrary element.
    fragment = "<fragment>"+fragment+"</fragment>";
    try
    {
        // Create a DOM builder and parse the fragment.
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        Document d = factory.newDocumentBuilder().parse(
                new InputSource(new StringReader(fragment)));

        // Import the nodes of the new document into doc so that they
        // will be compatible with doc.
        Node node = doc.importNode(d.getDocumentElement(), true);

        // Create the document fragment node to hold the new nodes.
        DocumentFragment docfrag = doc.createDocumentFragment();

        // Move the nodes into the fragment.
        while (node.hasChildNodes())
        {
            docfrag.appendChild(node.removeChild(node.getFirstChild()));
        }
        // Return the fragment.
        return docfrag;
    }
    catch (SAXException e)
    {
        // A parsing error occurred; the XML input is not valid.
    }
    catch (ParserConfigurationException e)
    {
    }
    catch (IOException e)
    {
    }
    return null;
}

#1