在我的程序中，我有文本窗格。在我在文本窗格中输入文本时，它仅更改蓝色的java关键字的颜色。我的程序选择了正确的单词，但是当我尝试设置单词属性时，它会抛出IllegalStateException我该如何解决它？
package event;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextPane;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledDocument;
public class SourceCodeWriter implements DocumentListener, KeyListener{
JTextPane pane;
public static JPanel contentPane;
public static JFrame frame;
int poistion = 0;
int start = 0;
int set = 0;
int lock = 0;
int count = 0;
int endPos = 0;
char key;
String word = "";
List<String> keywordList = new ArrayList<String>();
public SourceCodeWriter() {
}
public JPanel createContentPane() {
JPanel panel = new JPanel(new BorderLayout());
pane = new JTextPane();
pane.addKeyListener(this);
pane.getStyledDocument().addDocumentListener(this);
pane.setFont(new Font("Lucida Console",Font.BOLD,20));
panel.add(pane);
return panel;
}
@Override
public void changedUpdate(DocumentEvent e) {
}
@Override
public void insertUpdate(DocumentEvent e) {
if(key != '\n') {
word = word + key;
}
if(key == ' ' || (int)key == 10) {
set = 0;
lock = 0;
word = "";
}
if(lock == 1) {
endPos = e.getDocument().getLength();
}
if(keywordList.contains(word.trim())){
System.out.println("contains :"+word);
update(poistion,endPos-poistion,e);
}
if(lock == 0) {
poistion = count ;
lock = 1;
}
count++;
}
/**
* This method update the attribute set of java keyword word
* @param start starting position of the word
* @param length length of the word
* @param event document event on document where we change the attribute set
*/
public void update(int start,int length,DocumentEvent event) {
try {
System.out.println("Word : "+event.getDocument().getText(start, length)+ " #Position : Start : "+start+" end : "+(start+length));;
}
catch(Exception e) {
e.printStackTrace();
}
SimpleAttributeSet set = new SimpleAttributeSet();
StyleConstants.setForeground(set, Color.blue);
StyledDocument style = pane.getStyledDocument();
style.setCharacterAttributes(start, length, set, true);
}
@Override
public void removeUpdate(DocumentEvent e) {
// TODO Auto-generated method stub
}
public static void createAndShowGUI() {
JFrame.setDefaultLookAndFeelDecorated(true);
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
SourceCodeWriter obj = new SourceCodeWriter();
obj.loadKeywordList();
contentPane = obj.createContentPane();
frame.setContentPane(contentPane);
frame.setVisible(true);
frame.setSize(400,400);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
@Override
public void keyPressed(KeyEvent e) {
// TODO Auto-generated method stub
}
@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub
}
@Override
public void keyTyped(KeyEvent e) {
key = e.getKeyChar();
}
/**
* This method is used to load all Keyword in java in list from a txt file.
*/
public void loadKeywordList() {
File keywordFile = new File("D:/JavaKeywordList.txt");
String line ="";
try {
BufferedReader reader = new BufferedReader(new FileReader(keywordFile));
while((line = reader.readLine()) != null) {
keywordList.add(line.trim());
}
}
catch(IOException e) {
e.printStackTrace();
}
}
}
和执行日志：
Exception in thread "AWT-EventQueue-0" Word : int #Position : Start : 0 end : 3
java.lang.IllegalStateException: Attempt to mutate in notification
at javax.swing.text.AbstractDocument.writeLock(Unknown Source)
at javax.swing.text.DefaultStyledDocument.setCharacterAttributes(Unknown Source)
at event.SourceCodeWriter.update(SourceCodeWriter.java:96)
at event.SourceCodeWriter.insertUpdate(SourceCodeWriter.java:72)
at javax.swing.text.AbstractDocument.fireInsertUpdate(Unknown Source)
at javax.swing.text.AbstractDocument.handleInsertString(Unknown Source)
at javax.swing.text.AbstractDocument.insertString(Unknown Source)
at javax.swing.text.AbstractDocument.replace(Unknown Source)
at javax.swing.JTextPane.replaceSelection(Unknown Source)
at javax.swing.JTextPane.replaceSelection(Unknown Source)
at javax.swing.text.DefaultEditorKit$DefaultKeyTypedAction.actionPerformed(Unknown Source)
at javax.swing.SwingUtilities.notifyAction(Unknown Source)
at javax.swing.JComponent.processKeyBinding(Unknown Source)
at javax.swing.JComponent.processKeyBindings(Unknown Source)
at javax.swing.JComponent.processKeyEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
答案 0 :(得分：3)
将updateMethod（）中的代码更改为
StyledDocument style = pane.getStyledDocument();
Runnable runnable = new Runnable() {
@Override
public void run() {
style.setCharacterAttributes(start, length, set, true);
}
};
SwingUtilities.invokeLater(runnable);