获取’尝试改变通知’例外

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：

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); } } } } 

在窗格中输入任何内容后，我得到：

 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DocumentListener以外的东西？

Answer 1

您需要从Event Dispatcher Thread调用对文档的更改。

尝试这个：

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

Answer 2

我有同样的问题，我用这个来解决它：

 expiration_timeTF.getDocument().addDocumentListener( new DocumentListener() { @Override public void removeUpdate(DocumentEvent e) { System.out.println("remove"); } private void assistDateText() { Runnable doAssist = new Runnable() { @Override public void run() { // when input "2013",will add to "2013-";when // input "2013-10",will add to "2013-10-" String input = expiration_timeTF.getText(); if (input.matches("^[0-9]{4}")) { expiration_timeTF.setText(input + "-"); } else if (input.matches("^[0-9]{4}-[0-9]{2}")) { expiration_timeTF.setText(input + "-"); } } }; SwingUtilities.invokeLater(doAssist); } @Override public void insertUpdate(DocumentEvent e) { // System.out.println("insert"); assistDateText(); } @Override public void changedUpdate(DocumentEvent e) { // System.out.println("change"); } });