Java 输入框 undo
类UndoTextArea：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
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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