用html制作JEditorPane将正确格式的文本放入剪贴板

用html制作JEditorPane将正确格式的文本放入剪贴板,第1张

用html制作JEditorPane将正确格式的文本放入剪贴板

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);    }}


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