没有得到答案后，我袖手旁观，做了很多研究和学习。解决方案是为组件创建自定义TransferHandler，然后手动处理HTML文本。解决所有这些问题并不容易，这可以解释我得到的零答案。
这是一个可行的解决方案：
import javax.swing.*;import javax.swing.text.MutableAttributeSet;import javax.swing.text.html.HTML;import javax.swing.text.html.HTMLEditorKit;import javax.swing.text.html.parser.ParserDelegator;import java.awt.datatransfer.Clipboard;import java.awt.datatransfer.DataFlavor;import java.awt.datatransfer.Transferable;import java.awt.datatransfer.UnsupportedFlavorException;import java.io.IOException;import java.io.Reader;import java.io.StringReader;import java.util.ArrayList;public class ScratchSpace { public static void main(String[] args) { final Jframe frame = new Jframe(); final JEditorPane pane = new JEditorPane("text/html", "<html><font color=red>Hello</font><br>u2663<br>World"); pane.setTransferHandler(new MyTransferHandler()); frame.getContentPane().add(pane); frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); }}class MyTransferHandler extends TransferHandler { protected Transferable createTransferable(JComponent c) { final JEditorPane pane = (JEditorPane) c; final String htmlText = pane.getText(); final String plainText = extractText(new StringReader(htmlText)); return new MyTransferable(plainText, htmlText); } public String extractText(Reader reader) { final ArrayList<String> list = new ArrayList<String>(); HTMLEditorKit.ParserCallback parserCallback = new HTMLEditorKit.ParserCallback() { public void handleText(final char[] data, final int pos) { list.add(new String(data)); } public void handleStartTag(HTML.Tag tag, MutableAttributeSet attribute, int pos) { } public void handleEndTag(HTML.Tag t, final int pos) { } public void handleSimpleTag(HTML.Tag t, MutableAttributeSet a, final int pos) { if (t.equals(HTML.Tag.BR)) { list.add("n"); } } public void handleComment(final char[] data, final int pos) { } public void handleError(final String errMsg, final int pos) { } }; try { new ParserDelegator().parse(reader, parserCallback, true); } catch (IOException e) { e.printStackTrace(); } String result = ""; for (String s : list) { result += s; } return result; } @Override public void exportToClipboard(JComponent comp, Clipboard clip, int action) throws IllegalStateException { if (action == COPY) { clip.setContents(this.createTransferable(comp), null); } } @Override public int getSourceActions(JComponent c) { return COPY; }}class MyTransferable implements Transferable { private static final DataFlavor[] supportedFlavors; static { try { supportedFlavors = new DataFlavor[]{ new DataFlavor("text/html;class=java.lang.String"), new DataFlavor("text/plain;class=java.lang.String") }; } catch (ClassNotFoundException e) { throw new ExceptionInInitializerError(e); } } private final String plainData; private final String htmlData; public MyTransferable(String plainData, String htmlData) { this.plainData = plainData; this.htmlData = htmlData; } public DataFlavor[] getTransferDataFlavors() { return supportedFlavors; } public boolean isDataFlavorSupported(DataFlavor flavor) { for (DataFlavor supportedFlavor : supportedFlavors) { if (supportedFlavor == flavor) { return true; } } return false; } public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException { if (flavor.equals(supportedFlavors[0])) { return htmlData; } if (flavor.equals(supportedFlavors[1])) { return plainData; } throw new UnsupportedFlavorException(flavor); }}
