今天就跟大家聊聊有关使用Java怎么实现一个记事本功能，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。
源码：
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.util.*;
import java.io.*;
import javax.swing.undo.*;
import javax.swing.border.*;
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.event.*;
import java.awt.datatransfer.*;
public class Notepad extends JFrame implements ActionListener,DocumentListener
{ //菜单
JMenu fileMenu,editMenu,formatMenu,viewMenu,helpMenu;
//右键弹出菜单项
JPopupMenu popupMenu;
JMenuItem popupMenu_Undo,popupMenu_Cut,popupMenu_Copy,popupMenu_Paste,popupMenu_Delete,popupMenu_SelectAll;
//“文件”的菜单项
JMenuItem fileMenu_New,fileMenu_Open,fileMenu_Save,fileMenu_SaveAs,fileMenu_PageSetUp,fileMenu_Print,fileMenu_Exit;
//“编辑”的菜单项
JMenuItem editMenu_Undo,editMenu_Cut,editMenu_Copy,editMenu_Paste,editMenu_Delete,editMenu_Find,editMenu_FindNext,editMenu_Replace,editMenu_GoTo,editMenu_SelectAll,editMenu_TimeDate;
//“格式”的菜单项
JCheckBoxMenuItem formatMenu_LineWrap;
JMenuItem formatMenu_Font;
//“查看”的菜单项
JCheckBoxMenuItem viewMenu_Status;
//“帮助”的菜单项
JMenuItem helpMenu_HelpTopics,helpMenu_AboutNotepad;
//“文本”编辑区域
JTextArea editArea;
//状态栏标签
JLabel statusLabel;
//系统剪贴板
Toolkit toolkit=Toolkit.getDefaultToolkit();
Clipboard clipBoard=toolkit.getSystemClipboard();
//创建撤销操作管理器(与撤销操作有关)
protected UndoManager undo=new UndoManager();
protected UndoableEditListener undoHandler=new UndoHandler();
//其他变量
String oldValue;//存放编辑区原来的内容，用于比较文本是否有改动
boolean isNewFile=true;//是否新文件(未保存过的)
File currentFile;//当前文件名
//构造函数开始
public Notepad()
{
super("Java记事本");
//改变系统默认字体
Font font = new Font("Dialog", Font.PLAIN, 12);
java.util.Enumeration keys = UIManager.getDefaults().keys();
while (keys.hasMoreElements()) {
Object key = keys.nextElement();
Object value = UIManager.get(key);
if (value instanceof javax.swing.plaf.FontUIResource) {
UIManager.put(key, font);
}
}
//创建菜单条
JMenuBar menuBar=new JMenuBar();
//创建文件菜单及菜单项并注册事件监听
fileMenu=new JMenu("文件(F)");
fileMenu.setMnemonic('F');//设置快捷键ALT+F
fileMenu_New=new JMenuItem("新建(N)");
fileMenu_New.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N,InputEvent.CTRL_MASK));
fileMenu_New.addActionListener(this);
fileMenu_Open=new JMenuItem("打开(O)...");
fileMenu_Open.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,InputEvent.CTRL_MASK));
fileMenu_Open.addActionListener(this);
fileMenu_Save=new JMenuItem("保存(S)");
fileMenu_Save.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,InputEvent.CTRL_MASK));
fileMenu_Save.addActionListener(this);
fileMenu_SaveAs=new JMenuItem("另存为(A)...");
fileMenu_SaveAs.addActionListener(this);
fileMenu_PageSetUp=new JMenuItem("页面设置(U)...");
fileMenu_PageSetUp.addActionListener(this);
fileMenu_Print=new JMenuItem("打印(P)...");
fileMenu_Print.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_P, InputEvent.CTRL_MASK));
fileMenu_Print.addActionListener(this);
fileMenu_Exit=new JMenuItem("退出(X)");
fileMenu_Exit.addActionListener(this);
//创建编辑菜单及菜单项并注册事件监听
editMenu=new JMenu("编辑(E)");
editMenu.setMnemonic('E');//设置快捷键ALT+E
//当选择编辑菜单时，设置剪切、复制、粘贴、删除等功能的可用性
editMenu.addMenuListener(new MenuListener()
{ public void menuCanceled(MenuEvent e)//取消菜单时调用
{ checkMenuItemEnabled();//设置剪切、复制、粘贴、删除等功能的可用性
}
public void menuDeselected(MenuEvent e)//取消选择某个菜单时调用
{ checkMenuItemEnabled();//设置剪切、复制、粘贴、删除等功能的可用性
}
public void menuSelected(MenuEvent e)//选择某个菜单时调用
{ checkMenuItemEnabled();//设置剪切、复制、粘贴、删除等功能的可用性
}
});
editMenu_Undo=new JMenuItem("撤销(U)");
editMenu_Undo.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Z,InputEvent.CTRL_MASK));
editMenu_Undo.addActionListener(this);
editMenu_Undo.setEnabled(false);
editMenu_Cut=new JMenuItem("剪切(T)");
editMenu_Cut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,InputEvent.CTRL_MASK));
editMenu_Cut.addActionListener(this);
editMenu_Copy=new JMenuItem("复制(C)");
editMenu_Copy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_MASK));
editMenu_Copy.addActionListener(this);
editMenu_Paste=new JMenuItem("粘贴(P)");
editMenu_Paste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,InputEvent.CTRL_MASK));
editMenu_Paste.addActionListener(this);
editMenu_Delete=new JMenuItem("删除(D)");
editMenu_Delete.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_DELETE,0));
editMenu_Delete.addActionListener(this);
editMenu_Find=new JMenuItem("查找(F)...");
editMenu_Find.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F,InputEvent.CTRL_MASK));
editMenu_Find.addActionListener(this);
editMenu_FindNext=new JMenuItem("查找下一个(N)");
editMenu_FindNext.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F3,0));
editMenu_FindNext.addActionListener(this);
editMenu_Replace = new JMenuItem("替换(R)...",'R');
editMenu_Replace.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_H, InputEvent.CTRL_MASK));
editMenu_Replace.addActionListener(this);
editMenu_GoTo = new JMenuItem("转到(G)...",'G');
editMenu_GoTo.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_G, InputEvent.CTRL_MASK));
editMenu_GoTo.addActionListener(this);
editMenu_SelectAll = new JMenuItem("全选",'A');
editMenu_SelectAll.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, InputEvent.CTRL_MASK));
editMenu_SelectAll.addActionListener(this);
editMenu_TimeDate = new JMenuItem("时间/日期(D)",'D');
editMenu_TimeDate.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F5,0));
editMenu_TimeDate.addActionListener(this);
//创建格式菜单及菜单项并注册事件监听
formatMenu=new JMenu("格式(O)");
formatMenu.setMnemonic('O');//设置快捷键ALT+O
formatMenu_LineWrap=new JCheckBoxMenuItem("自动换行(W)");
formatMenu_LineWrap.setMnemonic('W');//设置快捷键ALT+W
formatMenu_LineWrap.setState(true);
formatMenu_LineWrap.addActionListener(this);
formatMenu_Font=new JMenuItem("字体(F)...");
formatMenu_Font.addActionListener(this);
//创建查看菜单及菜单项并注册事件监听
viewMenu=new JMenu("查看(V)");
viewMenu.setMnemonic('V');//设置快捷键ALT+V
viewMenu_Status=new JCheckBoxMenuItem("状态栏(S)");
viewMenu_Status.setMnemonic('S');//设置快捷键ALT+S
viewMenu_Status.setState(true);
viewMenu_Status.addActionListener(this);
//创建帮助菜单及菜单项并注册事件监听
helpMenu = new JMenu("帮助(H)");
helpMenu.setMnemonic('H');//设置快捷键ALT+H
helpMenu_HelpTopics = new JMenuItem("帮助主题(H)");
helpMenu_HelpTopics.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F1,0));
helpMenu_HelpTopics.addActionListener(this);
helpMenu_AboutNotepad = new JMenuItem("关于记事本(A)");
helpMenu_AboutNotepad.addActionListener(this);
//向菜单条添加"文件"菜单及菜单项
menuBar.add(fileMenu);
fileMenu.add(fileMenu_New);
fileMenu.add(fileMenu_Open);
fileMenu.add(fileMenu_Save);
fileMenu.add(fileMenu_SaveAs);
fileMenu.addSeparator(); //分隔线
fileMenu.add(fileMenu_PageSetUp);
fileMenu.add(fileMenu_Print);
fileMenu.addSeparator(); //分隔线
fileMenu.add(fileMenu_Exit);
//向菜单条添加"编辑"菜单及菜单项
menuBar.add(editMenu);
editMenu.add(editMenu_Undo);
editMenu.addSeparator(); //分隔线
editMenu.add(editMenu_Cut);
editMenu.add(editMenu_Copy);
editMenu.add(editMenu_Paste);
editMenu.add(editMenu_Delete);
editMenu.addSeparator(); //分隔线
editMenu.add(editMenu_Find);
editMenu.add(editMenu_FindNext);
editMenu.add(editMenu_Replace);
editMenu.add(editMenu_GoTo);
editMenu.addSeparator(); //分隔线
editMenu.add(editMenu_SelectAll);
editMenu.add(editMenu_TimeDate);
//向菜单条添加"格式"菜单及菜单项
menuBar.add(formatMenu);
formatMenu.add(formatMenu_LineWrap);
formatMenu.add(formatMenu_Font);
//向菜单条添加"查看"菜单及菜单项
menuBar.add(viewMenu);
viewMenu.add(viewMenu_Status);
//向菜单条添加"帮助"菜单及菜单项
menuBar.add(helpMenu);
helpMenu.add(helpMenu_HelpTopics);
helpMenu.addSeparator();
helpMenu.add(helpMenu_AboutNotepad);
//向窗口添加菜单条
this.setJMenuBar(menuBar);
//创建文本编辑区并添加滚动条
editArea=new JTextArea(20,50);
JScrollPane scroller=new JScrollPane(editArea);
scroller.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
this.add(scroller,BorderLayout.CENTER);//向窗口添加文本编辑区
editArea.setWrapStyleWord(true);//设置单词在一行不足容纳时换行
editArea.setLineWrap(true);//设置文本编辑区自动换行默认为true,即会"自动换行"
//this.add(editArea,BorderLayout.CENTER);//向窗口添加文本编辑区
oldValue=editArea.getText();//获取原文本编辑区的内容
//编辑区注册事件监听(与撤销操作有关)
editArea.getDocument().addUndoableEditListener(undoHandler);
editArea.getDocument().addDocumentListener(this);
//创建右键弹出菜单
popupMenu=new JPopupMenu();
popupMenu_Undo=new JMenuItem("撤销(U)");
popupMenu_Cut=new JMenuItem("剪切(T)");
popupMenu_Copy=new JMenuItem("复制(C)");
popupMenu_Paste=new JMenuItem("粘帖(P)");
popupMenu_Delete=new JMenuItem("删除(D)");
popupMenu_SelectAll=new JMenuItem("全选(A)");
popupMenu_Undo.setEnabled(false);
//向右键菜单添加菜单项和分隔符
popupMenu.add(popupMenu_Undo);
popupMenu.addSeparator();
popupMenu.add(popupMenu_Cut);
popupMenu.add(popupMenu_Copy);
popupMenu.add(popupMenu_Paste);
popupMenu.add(popupMenu_Delete);
popupMenu.addSeparator();
popupMenu.add(popupMenu_SelectAll);
//文本编辑区注册右键菜单事件
popupMenu_Undo.addActionListener(this);
popupMenu_Cut.addActionListener(this);
popupMenu_Copy.addActionListener(this);
popupMenu_Paste.addActionListener(this);
popupMenu_Delete.addActionListener(this);
popupMenu_SelectAll.addActionListener(this);
//文本编辑区注册右键菜单事件
editArea.addMouseListener(new MouseAdapter()
{ public void mousePressed(MouseEvent e)
{ if(e.isPopupTrigger())//返回此鼠标事件是否为该平台的弹出菜单触发事件
{ popupMenu.show(e.getComponent(),e.getX(),e.getY());//在组件调用者的坐标空间中的位置 X、Y 显示弹出菜单
}
checkMenuItemEnabled();//设置剪切，复制，粘帖，删除等功能的可用性
editArea.requestFocus();//编辑区获取焦点
}
public void mouseReleased(MouseEvent e)
{ if(e.isPopupTrigger())//返回此鼠标事件是否为该平台的弹出菜单触发事件
{ popupMenu.show(e.getComponent(),e.getX(),e.getY());//在组件调用者的坐标空间中的位置 X、Y 显示弹出菜单
}
checkMenuItemEnabled();//设置剪切，复制，粘帖，删除等功能的可用性
editArea.requestFocus();//编辑区获取焦点
}
});//文本编辑区注册右键菜单事件结束
//创建和添加状态栏
statusLabel=new JLabel(" 按F1获取帮助");
this.add(statusLabel,BorderLayout.SOUTH);//向窗口添加状态栏标签
//设置窗口在屏幕上的位置、大小和可见性
this.setLocation(100,100);
this.setSize(650,550);
this.setVisible(true);
//添加窗口监听器
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ exitWindowChoose();
}
});
checkMenuItemEnabled();
editArea.requestFocus();
}//构造函数Notepad结束
//设置菜单项的可用性：剪切，复制，粘帖，删除功能
public void checkMenuItemEnabled()
{ String selectText=editArea.getSelectedText();
if(selectText==null)
{ editMenu_Cut.setEnabled(false);
popupMenu_Cut.setEnabled(false);
editMenu_Copy.setEnabled(false);
popupMenu_Copy.setEnabled(false);
editMenu_Delete.setEnabled(false);
popupMenu_Delete.setEnabled(false);
}
else
{ editMenu_Cut.setEnabled(true);
popupMenu_Cut.setEnabled(true);
editMenu_Copy.setEnabled(true);
popupMenu_Copy.setEnabled(true);
editMenu_Delete.setEnabled(true);
popupMenu_Delete.setEnabled(true);
}
//粘帖功能可用性判断
Transferable contents=clipBoard.getContents(this);
if(contents==null)
{ editMenu_Paste.setEnabled(false);
popupMenu_Paste.setEnabled(false);
}
else
{ editMenu_Paste.setEnabled(true);
popupMenu_Paste.setEnabled(true);
}
}//方法checkMenuItemEnabled()结束
//关闭窗口时调用
public void exitWindowChoose()
{ editArea.requestFocus();
String currentValue=editArea.getText();
if(currentValue.equals(oldValue)==true)
{ System.exit(0);
}
else
{ int exitChoose=JOptionPane.showConfirmDialog(this,"您的文件尚未保存，是否保存？","退出提示",JOptionPane.YES_NO_CANCEL_OPTION);
if(exitChoose==JOptionPane.YES_OPTION)
{ //boolean isSave=false;
if(isNewFile)
{
String str=null;
JFileChooser fileChooser=new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
fileChooser.setApproveButtonText("确定");
fileChooser.setDialogTitle("另存为");
int result=fileChooser.showSaveDialog(this);
if(result==JFileChooser.CANCEL_OPTION)
{ statusLabel.setText(" 您没有保存文件");
return;
}
File saveFileName=fileChooser.getSelectedFile();
if(saveFileName==null||saveFileName.getName().equals(""))
{ JOptionPane.showMessageDialog(this,"不合法的文件名","不合法的文件名",JOptionPane.ERROR_MESSAGE);
}
else
{ try
{ FileWriter fw=new FileWriter(saveFileName);
BufferedWriter bfw=new BufferedWriter(fw);
bfw.write(editArea.getText(),0,editArea.getText().length());
bfw.flush();
fw.close();
isNewFile=false;
currentFile=saveFileName;
oldValue=editArea.getText();
this.setTitle(saveFileName.getName()+" - 记事本");
statusLabel.setText(" 当前打开文件:"+saveFileName.getAbsoluteFile());
//isSave=true;
}
catch(IOException ioException){
}
}
}
else
{
try
{ FileWriter fw=new FileWriter(currentFile);
BufferedWriter bfw=new BufferedWriter(fw);
bfw.write(editArea.getText(),0,editArea.getText().length());
bfw.flush();
fw.close();
//isSave=true;
}
catch(IOException ioException){
}
}
System.exit(0);
//if(isSave)System.exit(0);
//else return;
}
else if(exitChoose==JOptionPane.NO_OPTION)
{ System.exit(0);
}
else
{ return;
}
}
}//关闭窗口时调用方法结束
//查找方法
public void find()
{ final JDialog findDialog=new JDialog(this,"查找",false);//false时允许其他窗口同时处于激活状态(即无模式)
Container con=findDialog.getContentPane();//返回此对话框的contentPane对象
con.setLayout(new FlowLayout(FlowLayout.LEFT));
JLabel findContentLabel=new JLabel("查找内容(N)：");
final JTextField findText=new JTextField(15);
JButton findNextButton=new JButton("查找下一个(F)：");
final JCheckBox matchCheckBox=new JCheckBox("区分大小写(C)");
ButtonGroup bGroup=new ButtonGroup();
final JRadioButton upButton=new JRadioButton("向上(U)");
final JRadioButton downButton=new JRadioButton("向下(U)");
downButton.setSelected(true);
bGroup.add(upButton);
bGroup.add(downButton);
/*ButtonGroup此类用于为一组按钮创建一个多斥（multiple-exclusion）作用域。
使用相同的 ButtonGroup 对象创建一组按钮意味着“开启”其中一个按钮时，将关闭组中的其他所有按钮。*/
/*JRadioButton此类实现一个单选按钮，此按钮项可被选择或取消选择，并可为用户显示其状态。
与 ButtonGroup 对象配合使用可创建一组按钮，一次只能选择其中的一个按钮。
（创建一个 ButtonGroup 对象并用其 add 方法将 JRadioButton 对象包含在此组中。）*/
JButton cancel=new JButton("取消");
//取消按钮事件处理
cancel.addActionListener(new ActionListener()
{ public void actionPerformed(ActionEvent e)
{ findDialog.dispose();
}
});
//"查找下一个"按钮监听
findNextButton.addActionListener(new ActionListener()
{ public void actionPerformed(ActionEvent e)
{ //"区分大小写(C)"的JCheckBox是否被选中
int k=0,m=0;
final String str1,str2,str3,str4,strA,strB;
str1=editArea.getText();
str2=findText.getText();
str3=str1.toUpperCase();
str4=str2.toUpperCase();
if(matchCheckBox.isSelected())//区分大小写
{ strA=str1;
strB=str2;
}
else//不区分大小写,此时把所选内容全部化成大写(或小写)，以便于查找
{ strA=str3;
strB=str4;
}
if(upButton.isSelected())
{ //k=strA.lastIndexOf(strB,editArea.getCaretPosition()-1);
if(editArea.getSelectedText()==null)
k=strA.lastIndexOf(strB,editArea.getCaretPosition()-1);
else
k=strA.lastIndexOf(strB, editArea.getCaretPosition()-findText.getText().length()-1);
if(k>-1)
{ //String strData=strA.subString(k,strB.getText().length()+1);
editArea.setCaretPosition(k);
editArea.select(k,k+strB.length());
}
else
{ JOptionPane.showMessageDialog(null,"找不到您查找的内容！","查找",JOptionPane.INFORMATION_MESSAGE);
}
}
else if(downButton.isSelected())
{ if(editArea.getSelectedText()==null)
k=strA.indexOf(strB,editArea.getCaretPosition()+1);
else
k=strA.indexOf(strB, editArea.getCaretPosition()-findText.getText().length()+1);
if(k>-1)
{ //String strData=strA.subString(k,strB.getText().length()+1);
editArea.setCaretPosition(k);
editArea.select(k,k+strB.length());
}
else
{ JOptionPane.showMessageDialog(null,"找不到您查找的内容！","查找",JOptionPane.INFORMATION_MESSAGE);
}
}
}
});//"查找下一个"按钮监听结束
//创建"查找"对话框的界面
JPanel panel1=new JPanel();
JPanel panel2=new JPanel();
JPanel panel3=new JPanel();
JPanel directionPanel=new JPanel();
directionPanel.setBorder(BorderFactory.createTitledBorder("方向"));
//设置directionPanel组件的边框;
//BorderFactory.createTitledBorder(String title)创建一个新标题边框，使用默认边框（浮雕化）、默认文本位置（位于顶线上）、默认调整 (leading) 以及由当前外观确定的默认字体和文本颜色，并指定了标题文本。
directionPanel.add(upButton);
directionPanel.add(downButton);
panel1.setLayout(new GridLayout(2,1));
panel1.add(findNextButton);
panel1.add(cancel);
panel2.add(findContentLabel);
panel2.add(findText);
panel2.add(panel1);
panel3.add(matchCheckBox);
panel3.add(directionPanel);
con.add(panel2);
con.add(panel3);
findDialog.setSize(410,180);
findDialog.setResizable(false);//不可调整大小
findDialog.setLocation(230,280);
findDialog.setVisible(true);
}//查找方法结束
//替换方法
public void replace()
{ final JDialog replaceDialog=new JDialog(this,"替换",false);//false时允许其他窗口同时处于激活状态(即无模式)
Container con=replaceDialog.getContentPane();//返回此对话框的contentPane对象
con.setLayout(new FlowLayout(FlowLayout.CENTER));
JLabel findContentLabel=new JLabel("查找内容(N)：");
final JTextField findText=new JTextField(15);
JButton findNextButton=new JButton("查找下一个(F):");
JLabel replaceLabel=new JLabel("替换为(P)：");
final JTextField replaceText=new JTextField(15);
JButton replaceButton=new JButton("替换(R)");
JButton replaceAllButton=new JButton("全部替换(A)");
JButton cancel=new JButton("取消");
cancel.addActionListener(new ActionListener()
{ public void actionPerformed(ActionEvent e)
{ replaceDialog.dispose();
}
});
final JCheckBox matchCheckBox=new JCheckBox("区分大小写(C)");
ButtonGroup bGroup=new ButtonGroup();
final JRadioButton upButton=new JRadioButton("向上(U)");
final JRadioButton downButton=new JRadioButton("向下(U)");
downButton.setSelected(true);
bGroup.add(upButton);
bGroup.add(downButton);
/*ButtonGroup此类用于为一组按钮创建一个多斥（multiple-exclusion）作用域。
使用相同的 ButtonGroup 对象创建一组按钮意味着“开启”其中一个按钮时，将关闭组中的其他所有按钮。*/
/*JRadioButton此类实现一个单选按钮，此按钮项可被选择或取消选择，并可为用户显示其状态。
与 ButtonGroup 对象配合使用可创建一组按钮，一次只能选择其中的一个按钮。
（创建一个 ButtonGroup 对象并用其 add 方法将 JRadioButton 对象包含在此组中。）*/
//"查找下一个"按钮监听
findNextButton.addActionListener(new ActionListener()
{ public void actionPerformed(ActionEvent e)
{ //"区分大小写(C)"的JCheckBox是否被选中
int k=0,m=0;
final String str1,str2,str3,str4,strA,strB;
str1=editArea.getText();
str2=findText.getText();
str3=str1.toUpperCase();
str4=str2.toUpperCase();
if(matchCheckBox.isSelected())//区分大小写
{ strA=str1;
strB=str2;
}
else//不区分大小写,此时把所选内容全部化成大写(或小写)，以便于查找
{ strA=str3;
strB=str4;
}
if(upButton.isSelected())
{ //k=strA.lastIndexOf(strB,editArea.getCaretPosition()-1);
if(editArea.getSelectedText()==null)
k=strA.lastIndexOf(strB,editArea.getCaretPosition()-1);
else
k=strA.lastIndexOf(strB, editArea.getCaretPosition()-findText.getText().length()-1);
if(k>-1)
{ //String strData=strA.subString(k,strB.getText().length()+1);
editArea.setCaretPosition(k);
editArea.select(k,k+strB.length());
}
else
{ JOptionPane.showMessageDialog(null,"找不到您查找的内容！","查找",JOptionPane.INFORMATION_MESSAGE);
}
}
else if(downButton.isSelected())
{ if(editArea.getSelectedText()==null)
k=strA.indexOf(strB,editArea.getCaretPosition()+1);
else
k=strA.indexOf(strB, editArea.getCaretPosition()-findText.getText().length()+1);
if(k>-1)
{ //String strData=strA.subString(k,strB.getText().length()+1);
editArea.setCaretPosition(k);
editArea.select(k,k+strB.length());
}
else
{ JOptionPane.showMessageDialog(null,"找不到您查找的内容！","查找",JOptionPane.INFORMATION_MESSAGE);
}
}
}
});//"查找下一个"按钮监听结束
//"替换"按钮监听
replaceButton.addActionListener(new ActionListener()
{ public void actionPerformed(ActionEvent e)
{ if(replaceText.getText().length()==0 && editArea.getSelectedText()!=null)
editArea.replaceSelection("");
if(replaceText.getText().length()>0 && editArea.getSelectedText()!=null)
editArea.replaceSelection(replaceText.getText());
}
});//"替换"按钮监听结束
//"全部替换"按钮监听
replaceAllButton.addActionListener(new ActionListener()
{ public void actionPerformed(ActionEvent e)
{ editArea.setCaretPosition(0); //将光标放到编辑区开头
int k=0,m=0,replaceCount=0;
if(findText.getText().length()==0)
{ JOptionPane.showMessageDialog(replaceDialog,"请填写查找内容!","提示",JOptionPane.WARNING_MESSAGE);
findText.requestFocus(true);
return;
}
while(k>-1)//当文本中有内容被选中时(k>-1被选中)进行替换，否则不进行while循环
{ //"区分大小写(C)"的JCheckBox是否被选中
//int k=0,m=0;
final String str1,str2,str3,str4,strA,strB;
str1=editArea.getText();
str2=findText.getText();
str3=str1.toUpperCase();
str4=str2.toUpperCase();
if(matchCheckBox.isSelected())//区分大小写
{ strA=str1;
strB=str2;
}
else//不区分大小写,此时把所选内容全部化成大写(或小写)，以便于查找
{ strA=str3;
strB=str4;
}
if(upButton.isSelected())
{ //k=strA.lastIndexOf(strB,editArea.getCaretPosition()-1);
if(editArea.getSelectedText()==null)
k=strA.lastIndexOf(strB,editArea.getCaretPosition()-1);
else
k=strA.lastIndexOf(strB, editArea.getCaretPosition()-findText.getText().length()-1);
if(k>-1)
{ //String strData=strA.subString(k,strB.getText().length()+1);
editArea.setCaretPosition(k);
editArea.select(k,k+strB.length());
}
else
{ if(replaceCount==0)
{ JOptionPane.showMessageDialog(replaceDialog, "找不到您查找的内容!", "记事本",JOptionPane.INFORMATION_MESSAGE);
}
else
{ JOptionPane.showMessageDialog(replaceDialog,"成功替换"+replaceCount+"个匹配内容!","替换成功",JOptionPane.INFORMATION_MESSAGE);
}
}
}
else if(downButton.isSelected())
{ if(editArea.getSelectedText()==null)
k=strA.indexOf(strB,editArea.getCaretPosition()+1);
else
k=strA.indexOf(strB, editArea.getCaretPosition()-findText.getText().length()+1);
if(k>-1)
{ //String strData=strA.subString(k,strB.getText().length()+1);
editArea.setCaretPosition(k);
editArea.select(k,k+strB.length());
}
else
{ if(replaceCount==0)
{ JOptionPane.showMessageDialog(replaceDialog, "找不到您查找的内容!", "记事本",JOptionPane.INFORMATION_MESSAGE);
}
else
{ JOptionPane.showMessageDialog(replaceDialog,"成功替换"+replaceCount+"个匹配内容!","替换成功",JOptionPane.INFORMATION_MESSAGE);
}
}
}
if(replaceText.getText().length()==0 && editArea.getSelectedText()!= null)
{ editArea.replaceSelection("");
replaceCount++;
}
if(replaceText.getText().length()>0 && editArea.getSelectedText()!= null)
{ editArea.replaceSelection(replaceText.getText());
replaceCount++;
}
}//while循环结束
}
});//"替换全部"方法结束
//创建"替换"对话框的界面
JPanel directionPanel=new JPanel();
directionPanel.setBorder(BorderFactory.createTitledBorder("方向"));
//设置directionPanel组件的边框;
//BorderFactory.createTitledBorder(String title)创建一个新标题边框，使用默认边框（浮雕化）、默认文本位置（位于顶线上）、默认调整 (leading) 以及由当前外观确定的默认字体和文本颜色，并指定了标题文本。
directionPanel.add(upButton);
directionPanel.add(downButton);
JPanel panel1=new JPanel();
JPanel panel2=new JPanel();
JPanel panel3=new JPanel();
JPanel panel4=new JPanel();
panel4.setLayout(new GridLayout(2,1));
panel1.add(findContentLabel);
panel1.add(findText);
panel1.add(findNextButton);
panel4.add(replaceButton);
panel4.add(replaceAllButton);
panel2.add(replaceLabel);
panel2.add(replaceText);
panel2.add(panel4);
panel3.add(matchCheckBox);
panel3.add(directionPanel);
panel3.add(cancel);
con.add(panel1);
con.add(panel2);
con.add(panel3);
replaceDialog.setSize(420,220);
replaceDialog.setResizable(false);//不可调整大小
replaceDialog.setLocation(230,280);
replaceDialog.setVisible(true);
}//"全部替换"按钮监听结束
//"字体"方法
public void font()
{ final JDialog fontDialog=new JDialog(this,"字体设置",false);
Container con=fontDialog.getContentPane();
con.setLayout(new FlowLayout(FlowLayout.LEFT));
JLabel fontLabel=new JLabel("字体(F)：");
fontLabel.setPreferredSize(new Dimension(100,20));//构造一个Dimension，并将其初始化为指定宽度和高度
JLabel styleLabel=new JLabel("字形(Y)：");
styleLabel.setPreferredSize(new Dimension(100,20));
JLabel sizeLabel=new JLabel("大小(S)：");
sizeLabel.setPreferredSize(new Dimension(100,20));
final JLabel sample=new JLabel("张选仲的记事本-ZXZ's Notepad");
//sample.setHorizontalAlignment(SwingConstants.CENTER);
final JTextField fontText=new JTextField(9);
fontText.setPreferredSize(new Dimension(200,20));
final JTextField styleText=new JTextField(8);
styleText.setPreferredSize(new Dimension(200,20));
final int style[]={Font.PLAIN,Font.BOLD,Font.ITALIC,Font.BOLD+Font.ITALIC};
final JTextField sizeText=new JTextField(5);
sizeText.setPreferredSize(new Dimension(200,20));
JButton okButton=new JButton("确定");
JButton cancel=new JButton("取消");
cancel.addActionListener(new ActionListener()
{ public void actionPerformed(ActionEvent e)
{ fontDialog.dispose();
}
});
Font currentFont=editArea.getFont();
fontText.setText(currentFont.getFontName());
fontText.selectAll();
//styleText.setText(currentFont.getStyle());
//styleText.selectAll();
if(currentFont.getStyle()==Font.PLAIN)
styleText.setText("常规");
else if(currentFont.getStyle()==Font.BOLD)
styleText.setText("粗体");
else if(currentFont.getStyle()==Font.ITALIC)
styleText.setText("斜体");
else if(currentFont.getStyle()==(Font.BOLD+Font.ITALIC))
styleText.setText("粗斜体");
styleText.selectAll();
String str=String.valueOf(currentFont.getSize());
sizeText.setText(str);
sizeText.selectAll();
final JList fontList,styleList,sizeList;
GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment();
final String fontName[]=ge.getAvailableFontFamilyNames();
fontList=new JList(fontName);
fontList.setFixedCellWidth(86);
fontList.setFixedCellHeight(20);
fontList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
final String fontStyle[]={"常规","粗体","斜体","粗斜体"};
styleList=new JList(fontStyle);
styleList.setFixedCellWidth(86);
styleList.setFixedCellHeight(20);
styleList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
if(currentFont.getStyle()==Font.PLAIN)
styleList.setSelectedIndex(0);
else if(currentFont.getStyle()==Font.BOLD)
styleList.setSelectedIndex(1);
else if(currentFont.getStyle()==Font.ITALIC)
styleList.setSelectedIndex(2);
else if(currentFont.getStyle()==(Font.BOLD+Font.ITALIC))
styleList.setSelectedIndex(3);
final String fontSize[]={"8","9","10","11","12","14","16","18","20","22","24","26","28","36","48","72"};
sizeList=new JList(fontSize);
sizeList.setFixedCellWidth(43);
sizeList.setFixedCellHeight(20);
sizeList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
fontList.addListSelectionListener(new ListSelectionListener()
{ public void valueChanged(ListSelectionEvent event)
{ fontText.setText(fontName[fontList.getSelectedIndex()]);
fontText.selectAll();
Font sampleFont1=new Font(fontText.getText(),style[styleList.getSelectedIndex()],Integer.parseInt(sizeText.getText()));
sample.setFont(sampleFont1);
}
});
styleList.addListSelectionListener(new ListSelectionListener()
{ public void valueChanged(ListSelectionEvent event)
{ int s=style[styleList.getSelectedIndex()];
styleText.setText(fontStyle[s]);
styleText.selectAll();
Font sampleFont2=new Font(fontText.getText(),style[styleList.getSelectedIndex()],Integer.parseInt(sizeText.getText()));
sample.setFont(sampleFont2);
}
});
sizeList.addListSelectionListener(new ListSelectionListener()
{ public void valueChanged(ListSelectionEvent event)
{ sizeText.setText(fontSize[sizeList.getSelectedIndex()]);
//sizeText.requestFocus();
sizeText.selectAll();
Font sampleFont3=new Font(fontText.getText(),style[styleList.getSelectedIndex()],Integer.parseInt(sizeText.getText()));
sample.setFont(sampleFont3);
}
});
okButton.addActionListener(new ActionListener()
{ public void actionPerformed(ActionEvent e)
{ Font okFont=new Font(fontText.getText(),style[styleList.getSelectedIndex()],Integer.parseInt(sizeText.getText()));
editArea.setFont(okFont);
fontDialog.dispose();
}
});
JPanel samplePanel=new JPanel();
samplePanel.setBorder(BorderFactory.createTitledBorder("示例"));
//samplePanel.setLayout(new FlowLayout(FlowLayout.CENTER));
samplePanel.add(sample);
JPanel panel1=new JPanel();
JPanel panel2=new JPanel();
JPanel panel3=new JPanel();
//JPanel panel4=new JPanel();
//JPanel panel5=new JPanel();
//panel1.add(fontLabel);
//panel1.add(styleLabel);
//panel1.add(sizeLabel);
//panel2.add(fontText);
//panel2.add(new JScrollPane(fontList));//JList不支持直接滚动，所以要让JList作为JScrollPane的视口视图
//panel2.setLayout(new GridLayout(2,1));
//panel3.add(styleText);
//panel3.add(new JScrollPane(styleList));
//panel3.setLayout(new GridLayout(2,1));
//panel4.add(sizeText);
//panel4.add(new JScrollPane(sizeText));
//panel4.setLayout(new GridLayout(2,1));
//panel5.add(okButton);
//panel5.add(cancel);
//con.add(panel1);
//con.add(panel2);
//con.add(panel3);
//con.add(panel4);
//con.add(panel5);
panel2.add(fontText);
panel2.add(styleText);
panel2.add(sizeText);
panel2.add(okButton);
panel3.add(new JScrollPane(fontList));//JList不支持直接滚动，所以要让JList作为JScrollPane的视口视图
panel3.add(new JScrollPane(styleList));
panel3.add(new JScrollPane(sizeList));
panel3.add(cancel);
con.add(panel1);
con.add(panel2);
con.add(panel3);
con.add(samplePanel);
fontDialog.setSize(350,340);
fontDialog.setLocation(200,200);
fontDialog.setResizable(false);
fontDialog.setVisible(true);
}
//public void menuPerformed(MenuEvent e)
//{ checkMenuItemEnabled();//设置剪切、复制、粘贴、删除等功能的可用性
//}
public void actionPerformed(ActionEvent e)
{ //新建
if(e.getSource()==fileMenu_New)
{ editArea.requestFocus();
String currentValue=editArea.getText();
boolean isTextChange=(currentValue.equals(oldValue))?false:true;
if(isTextChange)
{ int saveChoose=JOptionPane.showConfirmDialog(this,"您的文件尚未保存，是否保存？","提示",JOptionPane.YES_NO_CANCEL_OPTION);
if(saveChoose==JOptionPane.YES_OPTION)
{ String str=null;
JFileChooser fileChooser=new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
//fileChooser.setApproveButtonText("确定");
fileChooser.setDialogTitle("另存为");
int result=fileChooser.showSaveDialog(this);
if(result==JFileChooser.CANCEL_OPTION)
{ statusLabel.setText("您没有选择任何文件");
return;
}
File saveFileName=fileChooser.getSelectedFile();
if(saveFileName==null || saveFileName.getName().equals(""))
{ JOptionPane.showMessageDialog(this,"不合法的文件名","不合法的文件名",JOptionPane.ERROR_MESSAGE);
}
else
{ try
{ FileWriter fw=new FileWriter(saveFileName);
BufferedWriter bfw=new BufferedWriter(fw);
bfw.write(editArea.getText(),0,editArea.getText().length());
bfw.flush();//刷新该流的缓冲
bfw.close();
isNewFile=false;
currentFile=saveFileName;
oldValue=editArea.getText();
this.setTitle(saveFileName.getName()+" - 记事本");
statusLabel.setText("当前打开文件："+saveFileName.getAbsoluteFile());
}
catch (IOException ioException)
{
}
}
}
else if(saveChoose==JOptionPane.NO_OPTION)
{ editArea.replaceRange("",0,editArea.getText().length());
statusLabel.setText(" 新建文件");
this.setTitle("无标题 - 记事本");
isNewFile=true;
undo.discardAllEdits(); //撤消所有的"撤消"操作
editMenu_Undo.setEnabled(false);
oldValue=editArea.getText();
}
else if(saveChoose==JOptionPane.CANCEL_OPTION)
{ return;
}
}
else
{ editArea.replaceRange("",0,editArea.getText().length());
statusLabel.setText(" 新建文件");
this.setTitle("无标题 - 记事本");
isNewFile=true;
undo.discardAllEdits();//撤消所有的"撤消"操作
editMenu_Undo.setEnabled(false);
oldValue=editArea.getText();
}
}//新建结束
//打开
else if(e.getSource()==fileMenu_Open)
{ editArea.requestFocus();
String currentValue=editArea.getText();
boolean isTextChange=(currentValue.equals(oldValue))?false:true;
if(isTextChange)
{ int saveChoose=JOptionPane.showConfirmDialog(this,"您的文件尚未保存，是否保存？","提示",JOptionPane.YES_NO_CANCEL_OPTION);
if(saveChoose==JOptionPane.YES_OPTION)
{ String str=null;
JFileChooser fileChooser=new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
//fileChooser.setApproveButtonText("确定");
fileChooser.setDialogTitle("另存为");
int result=fileChooser.showSaveDialog(this);
if(result==JFileChooser.CANCEL_OPTION)
{ statusLabel.setText("您没有选择任何文件");
return;
}
File saveFileName=fileChooser.getSelectedFile();
if(saveFileName==null || saveFileName.getName().equals(""))
{ JOptionPane.showMessageDialog(this,"不合法的文件名","不合法的文件名",JOptionPane.ERROR_MESSAGE);
}
else
{ try
{ FileWriter fw=new FileWriter(saveFileName);
BufferedWriter bfw=new BufferedWriter(fw);
bfw.write(editArea.getText(),0,editArea.getText().length());
bfw.flush();//刷新该流的缓冲
bfw.close();
isNewFile=false;
currentFile=saveFileName;
oldValue=editArea.getText();
this.setTitle(saveFileName.getName()+" - 记事本");
statusLabel.setText("当前打开文件："+saveFileName.getAbsoluteFile());
}
catch (IOException ioException)
{
}
}
}
else if(saveChoose==JOptionPane.NO_OPTION)
{ String str=null;
JFileChooser fileChooser=new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
//fileChooser.setApproveButtonText("确定");
fileChooser.setDialogTitle("打开文件");
int result=fileChooser.showOpenDialog(this);
if(result==JFileChooser.CANCEL_OPTION)
{ statusLabel.setText("您没有选择任何文件");
return;
}
File fileName=fileChooser.getSelectedFile();
if(fileName==null || fileName.getName().equals(""))
{ JOptionPane.showMessageDialog(this,"不合法的文件名","不合法的文件名",JOptionPane.ERROR_MESSAGE);
}
else
{ try
{ FileReader fr=new FileReader(fileName);
BufferedReader bfr=new BufferedReader(fr);
editArea.setText("");
while((str=bfr.readLine())!=null)
{ editArea.append(str);
}
this.setTitle(fileName.getName()+" - 记事本");
statusLabel.setText(" 当前打开文件："+fileName.getAbsoluteFile());
fr.close();
isNewFile=false;
currentFile=fileName;
oldValue=editArea.getText();
}
catch (IOException ioException)
{
}
}
}
else
{ return;
}
}
else
{ String str=null;
JFileChooser fileChooser=new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
//fileChooser.setApproveButtonText("确定");
fileChooser.setDialogTitle("打开文件");
int result=fileChooser.showOpenDialog(this);
if(result==JFileChooser.CANCEL_OPTION)
{ statusLabel.setText(" 您没有选择任何文件 ");
return;
}
File fileName=fileChooser.getSelectedFile();
if(fileName==null || fileName.getName().equals(""))
{ JOptionPane.showMessageDialog(this,"不合法的文件名","不合法的文件名",JOptionPane.ERROR_MESSAGE);
}
else
{ try
{ FileReader fr=new FileReader(fileName);
BufferedReader bfr=new BufferedReader(fr);
editArea.setText("");
while((str=bfr.readLine())!=null)
{ editArea.append(str);
}
this.setTitle(fileName.getName()+" - 记事本");
statusLabel.setText(" 当前打开文件："+fileName.getAbsoluteFile());
fr.close();
isNewFile=false;
currentFile=fileName;
oldValue=editArea.getText();
}
catch (IOException ioException)
{
}
}
}
}//打开结束
//保存
else if(e.getSource()==fileMenu_Save)
{ editArea.requestFocus();
if(isNewFile)
{ String str=null;
JFileChooser fileChooser=new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
//fileChooser.setApproveButtonText("确定");
fileChooser.setDialogTitle("保存");
int result=fileChooser.showSaveDialog(this);
if(result==JFileChooser.CANCEL_OPTION)
{ statusLabel.setText("您没有选择任何文件");
return;
}
File saveFileName=fileChooser.getSelectedFile();
if(saveFileName==null || saveFileName.getName().equals(""))
{ JOptionPane.showMessageDialog(this,"不合法的文件名","不合法的文件名",JOptionPane.ERROR_MESSAGE);
}
else
{ try
{ FileWriter fw=new FileWriter(saveFileName);
BufferedWriter bfw=new BufferedWriter(fw);
bfw.write(editArea.getText(),0,editArea.getText().length());
bfw.flush();//刷新该流的缓冲
bfw.close();
isNewFile=false;
currentFile=saveFileName;
oldValue=editArea.getText();
this.setTitle(saveFileName.getName()+" - 记事本");
statusLabel.setText("当前打开文件："+saveFileName.getAbsoluteFile());
}
catch (IOException ioException)
{
}
}
}
else
{ try
{ FileWriter fw=new FileWriter(currentFile);
BufferedWriter bfw=new BufferedWriter(fw);
bfw.write(editArea.getText(),0,editArea.getText().length());
bfw.flush();
fw.close();
}
catch(IOException ioException)
{
}
}
}//保存结束
//另存为
else if(e.getSource()==fileMenu_SaveAs)
{ editArea.requestFocus();
String str=null;
JFileChooser fileChooser=new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
//fileChooser.setApproveButtonText("确定");
fileChooser.setDialogTitle("另存为");
int result=fileChooser.showSaveDialog(this);
if(result==JFileChooser.CANCEL_OPTION)
{ statusLabel.setText(" 您没有选择任何文件");
return;
}
File saveFileName=fileChooser.getSelectedFile();
if(saveFileName==null||saveFileName.getName().equals(""))
{ JOptionPane.showMessageDialog(this,"不合法的文件名","不合法的文件名",JOptionPane.ERROR_MESSAGE);
}
else
{ try
{ FileWriter fw=new FileWriter(saveFileName);
BufferedWriter bfw=new BufferedWriter(fw);
bfw.write(editArea.getText(),0,editArea.getText().length());
bfw.flush();
fw.close();
oldValue=editArea.getText();
this.setTitle(saveFileName.getName()+" - 记事本");
statusLabel.setText(" 当前打开文件:"+saveFileName.getAbsoluteFile());
}
catch(IOException ioException)
{
}
}
}//另存为结束
//页面设置
else if(e.getSource()==fileMenu_PageSetUp)
{ editArea.requestFocus();
JOptionPane.showMessageDialog(this,"对不起，此功能尚未实现！更多请看http://pan.muyi.so","提示",JOptionPane.WARNING_MESSAGE);
}//页面设置结束
//打印
else if(e.getSource()==fileMenu_Print)
{ editArea.requestFocus();
JOptionPane.showMessageDialog(this,"对不起，此功能尚未实现！更多请看http://pan.muyi.so","提示",JOptionPane.WARNING_MESSAGE);
}//打印结束
//退出
else if(e.getSource()==fileMenu_Exit)
{ int exitChoose=JOptionPane.showConfirmDialog(this,"确定要退出吗?","退出提示",JOptionPane.OK_CANCEL_OPTION);
if(exitChoose==JOptionPane.OK_OPTION)
{ System.exit(0);
}
else
{ return;
}
}//退出结束
//编辑
//else if(e.getSource()==editMenu)
//{ checkMenuItemEnabled();//设置剪切、复制、粘贴、删除等功能的可用性
//}
//编辑结束
//撤销
else if(e.getSource()==editMenu_Undo || e.getSource()==popupMenu_Undo)
{ editArea.requestFocus();
if(undo.canUndo())
{ try
{ undo.undo();
}
catch (CannotUndoException ex)
{ System.out.println("Unable to undo:" + ex);
//ex.printStackTrace();
}
}
if(!undo.canUndo())
{ editMenu_Undo.setEnabled(false);
}
}//撤销结束
//剪切
else if(e.getSource()==editMenu_Cut || e.getSource()==popupMenu_Cut)
{ editArea.requestFocus();
String text=editArea.getSelectedText();
StringSelection selection=new StringSelection(text);
clipBoard.setContents(selection,null);
editArea.replaceRange("",editArea.getSelectionStart(),editArea.getSelectionEnd());
checkMenuItemEnabled();//设置剪切，复制，粘帖，删除功能的可用性
}//剪切结束
//复制
else if(e.getSource()==editMenu_Copy || e.getSource()==popupMenu_Copy)
{ editArea.requestFocus();
String text=editArea.getSelectedText();
StringSelection selection=new StringSelection(text);
clipBoard.setContents(selection,null);
checkMenuItemEnabled();//设置剪切，复制，粘帖，删除功能的可用性
}//复制结束
//粘帖
else if(e.getSource()==editMenu_Paste || e.getSource()==popupMenu_Paste)
{ editArea.requestFocus();
Transferable contents=clipBoard.getContents(this);
if(contents==null)return;
String text="";
try
{ text=(String)contents.getTransferData(DataFlavor.stringFlavor);
}
catch (Exception exception)
{
}
editArea.replaceRange(text,editArea.getSelectionStart(),editArea.getSelectionEnd());
checkMenuItemEnabled();
}//粘帖结束
//删除
else if(e.getSource()==editMenu_Delete || e.getSource()==popupMenu_Delete)
{ editArea.requestFocus();
editArea.replaceRange("",editArea.getSelectionStart(),editArea.getSelectionEnd());
checkMenuItemEnabled(); //设置剪切、复制、粘贴、删除等功能的可用性
}//删除结束
//查找
else if(e.getSource()==editMenu_Find)
{ editArea.requestFocus();
find();
}//查找结束
//查找下一个
else if(e.getSource()==editMenu_FindNext)
{ editArea.requestFocus();
find();
}//查找下一个结束
//替换
else if(e.getSource()==editMenu_Replace)
{ editArea.requestFocus();
replace();
}//替换结束
//转到
else if(e.getSource()==editMenu_GoTo)
{ editArea.requestFocus();
JOptionPane.showMessageDialog(this,"对不起，此功能尚未实现！更多请看http://pan.muyi.so","提示",JOptionPane.WARNING_MESSAGE);
}//转到结束
//时间日期
else if(e.getSource()==editMenu_TimeDate)
{ editArea.requestFocus();
//SimpleDateFormat currentDateTime=new SimpleDateFormat("HH:mmyyyy-MM-dd");
//editArea.insert(currentDateTime.format(new Date()),editArea.getCaretPosition());
Calendar rightNow=Calendar.getInstance();
Date date=rightNow.getTime();
editArea.insert(date.toString(),editArea.getCaretPosition());
}//时间日期结束
//全选
else if(e.getSource()==editMenu_SelectAll || e.getSource()==popupMenu_SelectAll)
{ editArea.selectAll();
}//全选结束
//自动换行(已在前面设置)
else if(e.getSource()==formatMenu_LineWrap)
{ if(formatMenu_LineWrap.getState())
editArea.setLineWrap(true);
else
editArea.setLineWrap(false);
}//自动换行结束
//字体设置
else if(e.getSource()==formatMenu_Font)
{ editArea.requestFocus();
font();
}//字体设置结束
//设置状态栏可见性
else if(e.getSource()==viewMenu_Status)
{ if(viewMenu_Status.getState())
statusLabel.setVisible(true);
else
statusLabel.setVisible(false);
}//设置状态栏可见性结束
//帮助主题
else if(e.getSource()==helpMenu_HelpTopics)
{ editArea.requestFocus();
JOptionPane.showMessageDialog(this,"路漫漫其修远兮，吾将上下而求索。","帮助主题",JOptionPane.INFORMATION_MESSAGE);
}//帮助主题结束
//关于
else if(e.getSource()==helpMenu_AboutNotepad)
{ editArea.requestFocus();
JOptionPane.showMessageDialog(this,
"&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&\n"+
" 编写者：沐伊科技 \n"+
" 编写时间：2016-06-09 \n"+
" 更多教程：http://pan.muyi.so (网盘资源教程应有尽有哦!) \n"+
" e-mail：llqqxf@163.com \n"+
" 一些地方借鉴他人，不足之处希望大家能提出意见，谢谢！ \n"+
"&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&\n",
"记事本",JOptionPane.INFORMATION_MESSAGE);
}//关于结束
}//方法actionPerformed()结束
//实现DocumentListener接口中的方法(与撤销操作有关)
public void removeUpdate(DocumentEvent e)
{ editMenu_Undo.setEnabled(true);
}
public void insertUpdate(DocumentEvent e)
{ editMenu_Undo.setEnabled(true);
}
public void changedUpdate(DocumentEvent e)
{ editMenu_Undo.setEnabled(true);
}//DocumentListener结束
//实现接口UndoableEditListener的类UndoHandler(与撤销操作有关)
class UndoHandler implements UndoableEditListener
{ public void undoableEditHappened(UndoableEditEvent uee)
{ undo.addEdit(uee.getEdit());
}
}
//main函数开始
public static void main(String args[])
{ Notepad notepad=new Notepad();
notepad.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//使用 System exit 方法退出应用程序
}//main函数结束
}看完上述内容，你们对使用Java怎么实现一个记事本功能有进一步的了解吗？如果还想了解更多知识或者相关内容，请关注亿速云行业资讯频道，感谢大家的支持。
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