如果你是为Android编写程序，你可以这样做……

androidx.core.text.HtmlCompat.fromHtml(指令,HtmlCompat.FROM_HTML_MODE_LEGACY) .toString ()

另一种方法是使用javax.swing.text.html.HTMLEditorKit来提取文本。

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

public class Html2Text extends HTMLEditorKit.ParserCallback {
    StringBuffer s;

    public Html2Text() {
    }

    public void parse(Reader in) throws IOException {
        s = new StringBuffer();
        ParserDelegator delegator = new ParserDelegator();
        // the third parameter is TRUE to ignore charset directive
        delegator.parse(in, this, Boolean.TRUE);
    }

    public void handleText(char[] text, int pos) {
        s.append(text);
    }

    public String getText() {
        return s.toString();
    }

    public static void main(String[] args) {
        try {
            // the HTML to convert
            FileReader in = new FileReader("java-new.html");
            Html2Text parser = new Html2Text();
            parser.parse(in);
            in.close();
            System.out.println(parser.getText());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

ref:从文件中删除HTML标记，只提取文本

这里有另一种方法:

public static String removeHTML(String input) {
    int i = 0;
    String[] str = input.split("");

    String s = "";
    boolean inTag = false;

    for (i = input.indexOf("<"); i < input.indexOf(">"); i++) {
        inTag = true;
    }
    if (!inTag) {
        for (i = 0; i < str.length; i++) {
            s = s + str[i];
        }
    }
    return s;
}

接受的答案并不适用于我所指出的测试用例:“a < b or b > c”的结果是“a b or b > c”。

所以，我用TagSoup代替。下面是一个对我的测试用例(以及其他一些测试用例)有效的示例:

import java.io.IOException;
import java.io.StringReader;
import java.util.logging.Logger;

import org.ccil.cowan.tagsoup.Parser;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;

/**
 * Take HTML and give back the text part while dropping the HTML tags.
 *
 * There is some risk that using TagSoup means we'll permute non-HTML text.
 * However, it seems to work the best so far in test cases.
 *
 * @author dan
 * @see <a href="http://home.ccil.org/~cowan/XML/tagsoup/">TagSoup</a> 
 */
public class Html2Text2 implements ContentHandler {
private StringBuffer sb;

public Html2Text2() {
}

public void parse(String str) throws IOException, SAXException {
    XMLReader reader = new Parser();
    reader.setContentHandler(this);
    sb = new StringBuffer();
    reader.parse(new InputSource(new StringReader(str)));
}

public String getText() {
    return sb.toString();
}

@Override
public void characters(char[] ch, int start, int length)
    throws SAXException {
    for (int idx = 0; idx < length; idx++) {
    sb.append(ch[idx+start]);
    }
}

@Override
public void ignorableWhitespace(char[] ch, int start, int length)
    throws SAXException {
    sb.append(ch);
}

// The methods below do not contribute to the text
@Override
public void endDocument() throws SAXException {
}

@Override
public void endElement(String uri, String localName, String qName)
    throws SAXException {
}

@Override
public void endPrefixMapping(String prefix) throws SAXException {
}


@Override
public void processingInstruction(String target, String data)
    throws SAXException {
}

@Override
public void setDocumentLocator(Locator locator) {
}

@Override
public void skippedEntity(String name) throws SAXException {
}

@Override
public void startDocument() throws SAXException {
}

@Override
public void startElement(String uri, String localName, String qName,
    Attributes atts) throws SAXException {
}

@Override
public void startPrefixMapping(String prefix, String uri)
    throws SAXException {
}
}

有时html字符串来自xml，带有这样的&lt。在使用Jsoup时，我们需要解析它，然后清理它。

Document doc = Jsoup.parse(htmlstrl);
Whitelist wl = Whitelist.none();
String plain = Jsoup.clean(doc.text(), wl);

而仅使用Jsoup.parse(htmlstrl).text()不能删除标签。

值得注意的是，如果您试图在Service Stack项目中完成此操作，那么它已经是一个内置的字符串扩展

using ServiceStack.Text;
// ...
"The <b>quick</b> brown <p> fox </p> jumps over the lazy dog".StripHtml();