Java 输入框 undo

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Java代码  
package com.pass.component;  
  
import java.awt.event.ActionEvent;  
  
import javax.swing.AbstractAction;  
import javax.swing.JTextArea;  
import javax.swing.KeyStroke;  
import javax.swing.event.UndoableEditEvent;  
import javax.swing.event.UndoableEditListener;  
import javax.swing.text.Document;  
import javax.swing.undo.CannotRedoException;  
import javax.swing.undo.CannotUndoException;  
import javax.swing.undo.UndoManager;  
  
public class UndoTextArea extends JTextArea  
{  
    private static final long serialVersionUID = 2622113838910292609L;  
    UndoManager undo = new UndoManager();  
    Document    doc  = getDocument();  
  
    public void stopUndo()  
    {  
//        undo.die();  
        undo.discardAllEdits();  
    }  
  
    public UndoTextArea()  
    {  
        doc.addUndoableEditListener(new UndoableEditListener()  
        {  
            public void undoableEditHappened(UndoableEditEvent e)  
            {  
                undo.addEdit(e.getEdit());  
            }  
        });  
        addActionMap();  
    }  
  
    public void addActionMap()  
    {  
        getActionMap().put("Undo", new AbstractAction("Undo11")  
        {  
            private static final long serialVersionUID = 2434402629308759912L;  
  
            public void actionPerformed(ActionEvent evt)  
            {  
                try  
                {  
                    boolean b = undo.canUndo();  
                    //                    System.out.println("whether undo : "+b);  
                    if (b)  
                    {  
                        undo.undo();  
                    }  
                }  
                catch (CannotUndoException e)  
                {  
                }  
            }  
        });  
        getInputMap().put(KeyStroke.getKeyStroke("control Z"), "Undo");  
  
        getActionMap().put("Redo", new AbstractAction("Redo1111")  
        {  
            private static final long serialVersionUID = 5348330289578410517L;  
  
            public void actionPerformed(ActionEvent evt)  
            {  
                try  
                {  
                    if (undo.canRedo())  
                    {  
                        undo.redo();  
                    }  
                }  
                catch (CannotRedoException e)  
                {  
                }  
            }  
        });  
        getInputMap().put(KeyStroke.getKeyStroke("control R"), "Redo");  
  
        getActionMap().put("Copy", new AbstractAction("Copy111")  
        {  
            private static final long serialVersionUID = -5151480809625853288L;  
  
            public void actionPerformed(ActionEvent evt)  
            {  
                copy();  
            }  
  
        });  
        getInputMap().put(KeyStroke.getKeyStroke("control C"), "Copy");  
  
        getActionMap().put("Cut", new AbstractAction("Cut")  
        {  
  
            private static final long serialVersionUID = 7316612864835857713L;  
  
            public void actionPerformed(ActionEvent evt)  
            {  
                cut();  
            }  
  
        });  
  
        getInputMap().put(KeyStroke.getKeyStroke("control X"), "Cut");  
  
        getActionMap().put("Paste", new AbstractAction("Paste111")  
        {  
            private static final long serialVersionUID = -3548620001691220571L;  
  
            public void actionPerformed(ActionEvent evt)  
            {  
                paste();  
            }  
        });  
  
        getInputMap().put(KeyStroke.getKeyStroke("control V"), "Paste");  
    }  
  
}  

测试类：FrameMain

Java代码  
package com.pass.test;  
  
import java.awt.Color;  
import java.awt.GridLayout;  
  
import javax.swing.JFrame;  
import javax.swing.JPanel;  
  
import com.pass.component.UndoTextArea;  
  
public class FrameMain extends JFrame  
{  
    private static final long serialVersionUID = 3526577815017461757L;  
    public static void main(String[] args)  
    {  
        new FrameMain().launchFrame();  
    }  
    public void launchFrame(){  
        JPanel pane=new JPanel();  
        pane.setLayout(new GridLayout(2, 1));  
        UndoTextArea txt1= new UndoTextArea();  
        txt1.setBackground(new Color(255, 255, 100));  
        txt1.setText("txt1");  
        txt1.stopUndo();  
        UndoTextArea txt2= new UndoTextArea();  
        txt2.setBackground(new Color(255, 100, 100));  
        txt2.setText("txt2");  
        txt2.stopUndo();  
        pane.add(txt1);  
        pane.add(txt2);  
        this.getContentPane().add(pane);  
        this.setBounds(100, 100, 400, 400);  
        this.setDefaultCloseOperation(3);  
        this.setVisible(true);  
    }  
  
}  

运行FrameMain，弹出swing窗口

随便输入什么内容，然后Ctrl+Z 就可以进行测试了。

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