获取'尝试改变通知'例外 [英] Getting 'Attempt to mutate notification' exception

问题描述

我的目标是将用户编写的关键字的蓝色着色实现到JTextPane中。这就是我的代码的样子：

My goal is to implement blue coloring of keywords written by user into JTextPane. This is how my code look like:

private class DocumentHandler implements DocumentListener {

        @Override
        public void changedUpdate(DocumentEvent ev) {
        }

        @Override
        public void insertUpdate(DocumentEvent ev) {
            highlight();
        }

        @Override
        public void removeUpdate(DocumentEvent ev) {
            highlight();
        }

        private void highlight() {
            String code = codePane.getText();
            SimpleAttributeSet defSet = new SimpleAttributeSet();
            StyleConstants.setForeground(defSet, Color.BLACK);
            doc.setCharacterAttributes(0, code.length(), defSet, true);
            SimpleAttributeSet set = new SimpleAttributeSet();
            StyleConstants.setForeground(set, Color.BLUE);
            for (String keyword : keywords) {
                Pattern pattern = Pattern.compile(keyword + "(\\[\\])*");
                Matcher matcher = pattern.matcher(code);
                while (matcher.find()) {

                    //Just for test
                    System.out.print("Start index: " + matcher.start());
                    System.out.print(" End index: " + matcher.end());
                    System.out.println(" Found: " + matcher.group());

                    doc.setCharacterAttributes(matcher.start(), keyword.length(), set, true);
                }
            }
        }
    }

之后在窗格中键入任何内容我得到：

After typing anything into pane I get:

Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Attempt to mutate in notification
    at javax.swing.text.AbstractDocument.writeLock(AbstractDocument.java:1338)
    at javax.swing.text.DefaultStyledDocument.setCharacterAttributes(DefaultStyledDocument.java:500)
    at jnotepad.MainPanel$DocumentHandler.highlight(MainPanel.java:121)
    at jnotepad.MainPanel$DocumentHandler.insertUpdate(MainPanel.java:108)
    at javax.swing.text.AbstractDocument.fireInsertUpdate(AbstractDocument.java:202)
    at javax.swing.text.AbstractDocument.handleInsertString(AbstractDocument.java:749)

如何解决我的问题？也许我应该使用除DocumentListener以外的东西？

How to solve my problem? Maybe I should use something other than DocumentListener?

推荐答案

您需要从事件调度程序线程调用对文档的更改。

You need to invoke changes to the document from the Event Dispatcher Thread.

试试这个：

private void highlight() {

    Runnable doHighlight = new Runnable() {
        @Override
        public void run() {
            // your highlight code
        }
    };       
    SwingUtilities.invokeLater(doHighlight);
}

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