使用JAVA swing实现简单的记事本
来源：互联网 发布：传智播客 云计算大数据 编辑：程序博客网 时间：2024/05/16 04:48
最近刚学完java swing就做个记事本玩玩，有些功能还没实现，还有很多不足之处
本记事本具有查找、新建、保存、另存为、打开、设置字体、设置字体颜色、设置背景颜色、状态栏等功能。
以下是主函数：
package cslg.yao.main;import java.awt.EventQueue;import cslg.yao.Frame.MyFrame;public class Mainview {public static void main(String[] args) {EventQueue.invokeLater(new Runnable() {@Overridepublic void run() {try {MyFrame frame=new MyFrame();frame.setVisible(true);} catch (Exception e) {e.printStackTrace();}}});}}
以下是实现函数：
package cslg.yao.Frame;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Container;import java.awt.FlowLayout;import java.awt.Font;import java.awt.GridLayout;import java.awt.Image;import java.awt.Toolkit;import java.awt.datatransfer.Clipboard;import java.awt.datatransfer.DataFlavor;import java.awt.datatransfer.StringSelection;import java.awt.datatransfer.Transferable;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.InputEvent;import java.awt.event.KeyEvent;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;import java.io.OutputStream;import java.io.OutputStreamWriter;import java.io.PrintWriter;import java.io.RandomAccessFile;import java.nio.ByteBuffer;import java.nio.channels.FileChannel;import java.util.Calendar;import java.util.Date;import java.util.Properties;import java.util.Timer;import java.util.TimerTask;import javax.swing.BorderFactory;import javax.swing.ButtonGroup;import javax.swing.JButton;import javax.swing.JCheckBox;import javax.swing.JCheckBoxMenuItem;import javax.swing.JColorChooser;import javax.swing.JDialog;import javax.swing.JFileChooser;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JPopupMenu;import javax.swing.JRadioButton;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JTextField;import javax.swing.KeyStroke;import javax.swing.event.DocumentEvent;import javax.swing.event.DocumentListener;import javax.swing.event.MenuEvent;import javax.swing.event.MenuListener;import javax.swing.event.UndoableEditEvent;import javax.swing.event.UndoableEditListener;import javax.swing.undo.CannotUndoException;import javax.swing.undo.UndoManager;import cslg.yao.font.MyFont;public class MyFrame extends JFrame implements ActionListener,DocumentListener{/** * */private static final long serialVersionUID = 8141051389716751825L;//菜单 JMenu fileMenu,editMenu,formatMenu,viewMenu,helpMenu;//“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,formatMenu_BackColor,formatMenu_FrontColor; //“查看”的菜单项 JCheckBoxMenuItem viewMenu_Status; //“帮助”的菜单项 JMenuItem helpMenu_HelpTopics,helpMenu_AboutNotepad;//右键弹出菜单项 JPopupMenu popupMenu; JMenuItem popupMenu_Undo,popupMenu_Cut,popupMenu_Copy,popupMenu_Paste,popupMenu_Delete,popupMenu_SelectAll; //“文本”编辑区域 JTextArea editArea; //状态栏标签 JLabel statusLabel;JLabel statusLabel2;//滚动条JScrollPane scroller;//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();boolean isNewFile=true;//是否新文件(未保存过的)String oldValue;//存放编辑区原来的内容，用于比较文本是否有改动 File currentFile;//当前文件名 Font myFont;//构造函数public MyFrame() {initMenu();initFrame();Timer t = new Timer(true);MyTask task=new MyTask();t.schedule(task,1000,1000);}//构造函数结束//初始化菜单public void initMenu(){//设置菜单栏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);formatMenu_BackColor=new JMenuItem("设置背景颜色");formatMenu_BackColor.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_B,InputEvent.SHIFT_MASK+InputEvent.ALT_MASK));formatMenu_BackColor.addActionListener(this);formatMenu_FrontColor=new JMenuItem("设置字体颜色");formatMenu_FrontColor.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F,InputEvent.SHIFT_MASK+InputEvent.ALT_MASK));formatMenu_FrontColor.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);formatMenu.add(formatMenu_BackColor);formatMenu.add(formatMenu_FrontColor);//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); 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 JPanel panel1=new JPanel();statusLabel=new JLabel("");statusLabel2=new JLabel("文件状态");panel1.add(statusLabel);panel1.add(statusLabel2);this.add(panel1,BorderLayout.SOUTH);//向窗口添加状态栏标签 //添加窗口监听器 addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { exitWindowChoose(); } }); checkMenuItemEnabled(); editArea.requestFocus();}//初始化窗体public void initFrame(){Properties p = new Properties();//设置窗体大小位置try {if(new File("src/size.properties").exists()){p.load(new FileReader("src/size.properties"));this.setBounds(Integer.parseInt(p.getProperty("x")), Integer.parseInt(p.getProperty("y")), Integer.parseInt(p.getProperty("width")), Integer.parseInt(p.getProperty("height")));myFont = new Font(p.getProperty("FontName"),Integer.parseInt(p.getProperty("FontStyle")),Integer.parseInt(p.getProperty("FontSize")));editArea.setFont(myFont);editArea.setForeground(new Color(Integer.parseInt(p.getProperty("foreColor"))));editArea.setBackground(new Color(Integer.parseInt(p.getProperty("backColor"))));}else{this.setSize(640,480);this.setLocationRelativeTo(null);}} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}//设置子对话框关闭但主对话框可以继续保留！！！！！！！this.setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);//设置图标Image img=toolkit.getImage("img/logo.jpg");this.setIconImage(img);//设置标题名称this.setTitle("呱？呱！");}//初始化窗体结束//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 //关闭窗口时发生public void exitWindowChoose() {editArea.requestFocus();String currentvalue =editArea.getText();//获取当前编辑域的内容//如果当选内容与之前内容无变化，直接退出if (currentvalue.equals(oldValue)) {setMemory();System.exit(0);}//否则弹出对话框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);//当选择是按钮if (exitChoose==JOptionPane.YES_OPTION) {//判断是否是新文件if (isNewFile) {savenew();}//不是新文件else {savenotnew();}setMemory();System.exit(0);}else if (exitChoose==JOptionPane.NO_OPTION) {setMemory();System.exit(0);}else if (exitChoose==JOptionPane.CANCEL_OPTION) {statusLabel2.setText("您没有保存文件！");return;}else {return;}}}//结束//实现监听器各个功能@Overridepublic void actionPerformed(ActionEvent e) {//新建菜单功能实现if (e.getSource()==fileMenu_New) {String currentvalue=editArea.getText();boolean isTextchange=(currentvalue.equals(oldValue))?true:false;//文本内容是否变动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) {saveother();} //当选择否按钮是else if(saveChoose==JOptionPane.NO_OPTION) { filenew();}//当选择取消按钮时else if(saveChoose==JOptionPane.CANCEL_OPTION) { statusLabel2.setText("您没有选择新建文件");return; } }else { filenew(); }}//新建结束//向菜单实现打开功能else if (e.getSource()==fileMenu_Open) {//editArea.requestFocus();String currentValue=editArea.getText();boolean isTextchange=(currentValue.equals(oldValue))?true:false;//判断文件是否变动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);//当选择是按钮if (saveChoose==JOptionPane.YES_OPTION) {saveother();}//当选择否按钮else if(saveChoose==JOptionPane.NO_OPTION) {fileopen();} else { return; } }//文件内容无变动执行else {fileopen();} }//打开结束//保存else if (e.getSource()==fileMenu_Save) {//editArea.requestFocus();//是否是新文件if(isNewFile) {savenew();}//不是新文件执行else {savenotnew();} }//保存结束//另存为else if (e.getSource()==fileMenu_SaveAs) {saveother();}//另存为结束//页面设置功能else if (e.getSource()==fileMenu_PageSetUp) {JOptionPane.showMessageDialog(this,"此功能尚未实现！","提示",JOptionPane.WARNING_MESSAGE);}//打印功能else if (e.getSource()==fileMenu_Print) {JOptionPane.showMessageDialog(this,"此功能尚未实现！","提示",JOptionPane.WARNING_MESSAGE);}//退出功能else if (e.getSource()==fileMenu_Exit) {exitWindowChoose();}//退出结束//编辑的撤销功能else if(e.getSource()==editMenu_Undo || e.getSource()==popupMenu_Undo) { if(undo.canUndo()) { try { undo.undo(); } catch (CannotUndoException ex) { System.out.println("Unable to undo:" + ex); } } if(!undo.canUndo()) { editMenu_Undo.setEnabled(false);popupMenu_Undo.setEnabled(false);} }//撤销结束//剪切功能else if (e.getSource()==editMenu_Cut || e.getSource()==popupMenu_Cut) {//editArea.requestFocus();String text =editArea.getSelectedText();StringSelection selection=new StringSelection(text);//构建String数据类型clipBoard.setContents(selection, null);//添加文本到系统剪切板 editArea.replaceRange("",editArea.getSelectionStart(),editArea.getSelectionEnd());checkMenuItemEnabled();}//功能结束//复制功能else if (e.getSource()==editMenu_Copy || e.getSource()==popupMenu_Copy) {//editArea.requestFocus(); String text=editArea.getSelectedText(); StringSelection selection=new StringSelection(text);//构建String数据类型 clipBoard.setContents(selection,null);//添加文本到系统剪切板checkMenuItemEnabled();}//功能结束//粘贴功能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); //表示 Java Unicode String 类} catch (Exception exception) {exception.printStackTrace();} editArea.replaceRange(text,editArea.getSelectionStart(),editArea.getSelectionEnd()); checkMenuItemEnabled();}//功能结束//删除功能else if (e.getSource()==editMenu_Delete || e.getSource()==popupMenu_Delete) {//editArea.requestFocus();editArea.replaceRange("",editArea.getSelectionStart(),editArea.getSelectionEnd());checkMenuItemEnabled();}//功能结束//查找功能else if (e.getSource()==editMenu_Find) {find();}//功能结束功能//查找下一个else if (e.getSource()==editMenu_FindNext) {find();}//功能结束//替换功能else if (e.getSource()==editMenu_Replace) {JOptionPane.showMessageDialog(this,"此功能尚未实现！","提示",JOptionPane.WARNING_MESSAGE);}//功能结束//转到功能else if (e.getSource()==editMenu_GoTo) {JOptionPane.showMessageDialog(this,"此功能尚未实现！","提示",JOptionPane.WARNING_MESSAGE);}//功能结束//全选功能else if (e.getSource()==editMenu_SelectAll || e.getSource()==popupMenu_SelectAll) {editArea.selectAll();}//功能结束//时间日期功能else if (e.getSource()==editMenu_TimeDate) {Calendar now=Calendar.getInstance();Date date =now.getTime();editArea.insert(date.toString(),editArea.getCaretPosition());}//功能结束//自动换行功能（默认设为开启）else if (e.getSource()==formatMenu_LineWrap) {if(formatMenu_LineWrap.getState()) editArea.setLineWrap(true); else editArea.setLineWrap(false); }//功能结束//字体设置功能else if (e.getSource()==formatMenu_Font) {MyFont font=new MyFont(editArea.getFont());int returnvalue=font.showFontDialog(this);if (returnvalue==font.APPROVE_OPTION) {Font f=font.getSelectFont();editArea.setFont(f);}else {statusLabel2.setText("未选择新字体！");return;}}//功能结束//选择背景颜色功能else if (e.getSource()==formatMenu_BackColor) {Color c=JColorChooser.showDialog(this,"颜色选择",Color.BLACK);editArea.setBackground(c);}//功能结束else if (e.getSource()==formatMenu_FrontColor) {Color c=JColorChooser.showDialog(this,"颜色选择",Color.BLACK);editArea.setForeground(c);}//状态栏功能(默认可见)else if (e.getSource()==viewMenu_Status) {if(viewMenu_Status.getState()){statusLabel.setVisible(true);statusLabel2.setVisible(true);} else{statusLabel.setVisible(false);statusLabel2.setVisible(false);} }//功能结束//帮助主题else if (e.getSource()==helpMenu_HelpTopics) {JOptionPane.showMessageDialog(this,"此功能尚未实现！","提示",JOptionPane.WARNING_MESSAGE);}else if (e.getSource()==helpMenu_AboutNotepad) {JOptionPane.showMessageDialog(this, "**********************\n"+ "* 编写者姚志文 *\n"+ "* 2017/8/14 *\n"+ "**********************", "呱？呱！", JOptionPane.QUESTION_MESSAGE);}}//记住自己的配置public void setMemory(){Properties size = new Properties();size.setProperty("x", this.getBounds().x+"");size.setProperty("y", this.getBounds().y+"");size.setProperty("width", this.getBounds().width+"");size.setProperty("height", this.getBounds().height+"");size.setProperty("FontName", this.editArea.getFont().getFamily());size.setProperty("FontStyle", this.editArea.getFont().getStyle()+"");size.setProperty("FontSize", this.editArea.getFont().getSize()+"");size.setProperty("foreColor", this.editArea.getForeground().getRGB()+"");size.setProperty("backColor", this.editArea.getBackground().getRGB()+"");FileWriter fr;try {fr = new FileWriter("src/size.properties");size.store(fr, "Size Info");fr.close();} catch (IOException e2) {e2.printStackTrace();}}//新文件时保存public void savenew(){JFileChooser fileChooser=new JFileChooser();fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);fileChooser.setApproveButtonText("确定");fileChooser.setDialogTitle("另存为");int result=fileChooser.showSaveDialog(this);//如果选择取消向状态栏添加提示if (result==JFileChooser.CANCEL_OPTION) {statusLabel2.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);}//合法文件名else {//保存文件try {OutputStream os=new FileOutputStream(saveFileName);OutputStreamWriter osw=new OutputStreamWriter(os);//FileWriter fw=new FileWriter(saveFileName);//BufferedWriter bfw=new BufferedWriter(fw);PrintWriter pw = new PrintWriter(osw);pw.write(editArea.getText());pw.flush();pw.close();isNewFile=false;currentFile=saveFileName;this.setTitle(saveFileName.getName()+"- 呱？呱！");statusLabel2.setText("当前文件为："+saveFileName.getAbsoluteFile());} catch (IOException e) {e.printStackTrace();}}}//不是新文件时保存public void savenotnew(){try {OutputStream os=new FileOutputStream(currentFile);OutputStreamWriter osw=new OutputStreamWriter(os);//FileWriter fw=new FileWriter(currentFile);//BufferedWriter bfw=new BufferedWriter(fw);PrintWriter pw = new PrintWriter(osw);pw.write(editArea.getText());pw.flush();pw.close();} catch (IOException e) {e.printStackTrace();}}//另存为public void saveother(){JFileChooser fileChooser=new JFileChooser(); fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY); fileChooser.setDialogTitle("另存为"); int result=fileChooser.showSaveDialog(this); //如果选择取消向状态栏添加提示if(result==JFileChooser.CANCEL_OPTION) { statusLabel2.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); }//合法文件名else { //保存文件try { OutputStream os=new FileOutputStream(saveFileName);//FileWriter fw=new FileWriter(saveFileName); //BufferedWriter bfw=new BufferedWriter(fw);OutputStreamWriter osw=new OutputStreamWriter(os);PrintWriter pw=new PrintWriter(osw);pw.write(editArea.getText()); pw.flush();pw.close(); isNewFile=false; currentFile=saveFileName; oldValue=editArea.getText(); this.setTitle(saveFileName.getName()+" - 呱？呱！"); statusLabel2.setText("当前打开文件："+saveFileName.getAbsoluteFile()); } catch (IOException ioException) {ioException.printStackTrace();} } }//新建文件操作public void filenew(){editArea.replaceRange("",0,editArea.getText().length()); statusLabel2.setText(" 新建文件"); this.setTitle("无标题 - 呱？呱！"); isNewFile=true; undo.discardAllEdits(); //撤消所有的"撤消"操作 editMenu_Undo.setEnabled(false); oldValue=editArea.getText();}//打开文件操作public void fileopen(){JFileChooser fileChooser=new JFileChooser(); fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY); fileChooser.setDialogTitle("打开文件"); int result=fileChooser.showOpenDialog(this);//如果选择取消向状态栏添加提示if(result==JFileChooser.CANCEL_OPTION) { statusLabel2.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); }//合法文件名else { //读取文件try { FileInputStream fis=new FileInputStream(fileName);byte[] content=new byte[fis.available()];fis.read(content);editArea.setText(new String(content));editArea.setCaretPosition(0);fis.close();//FileChannel fcin = new RandomAccessFile(fileName, "r").getChannel(); //ByteBuffer rBuffer = ByteBuffer.allocate(1024*1024*7);////try{ //byte[] bs = new byte[1024*1024*7]; ////while(fcin.read(rBuffer) != -1){ //int rSize = rBuffer.position(); //rBuffer.rewind(); //rBuffer.get(bs); //rBuffer.clear(); //String tempString = new String(bs, 0, rSize); ////System.out.println(tempString);//editArea.setText(tempString);//} //} catch (IOException e) { //// TODO Auto-generated catch block //e.printStackTrace(); //} this.setTitle(fileName.getName()+" - 呱？呱！");statusLabel2.setText(" 当前打开文件："+fileName.getAbsoluteFile()); //fr.close(); isNewFile=false; currentFile=fileName; oldValue=editArea.getText(); } catch (Exception ioException) {ioException.printStackTrace();} } }//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 //内部类实现显示时间class MyTask extends TimerTask {@Overridepublic void run() {statusLabel.setText(new Date().toString());System.gc();}} //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()); } }//当文本发生改变@Overridepublic void changedUpdate(DocumentEvent e) {editMenu_Undo.setEnabled(true);popupMenu_Undo.setEnabled(true);}//当文本发生插入@Overridepublic void insertUpdate(DocumentEvent e) {editMenu_Undo.setEnabled(true);popupMenu_Undo.setEnabled(true);}//当文本发生删除@Overridepublic void removeUpdate(DocumentEvent e) {editMenu_Undo.setEnabled(true);popupMenu_Undo.setEnabled(true);}}以下是字体实现函数（引用网上的实现类）
package cslg.yao.font;import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.GraphicsEnvironment; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.FocusEvent; import java.awt.event.FocusListener; import javax.swing.BorderFactory; import javax.swing.Box; import javax.swing.ButtonGroup; import javax.swing.JButton; import javax.swing.JDialog; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JList; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JRadioButton; import javax.swing.JScrollPane; import javax.swing.JTextField; import javax.swing.event.ListSelectionEvent; import javax.swing.event.ListSelectionListener; import javax.swing.text.AttributeSet; import javax.swing.text.BadLocationException; import javax.swing.text.Document; import javax.swing.text.PlainDocument; /** * 字体选择器，仿记事本中的字体控件，使用操作方法与文件选择器JFileChooser基本相同。 * */ @SuppressWarnings("serial") public class MyFont extends JDialog { /** * 选择取消按钮的返回值 */ public static final int CANCEL_OPTION = 0; /** * 选择确定按钮的返回值 */ public static final int APPROVE_OPTION = 1; /** * 中文预览的字符串 */ private static final String CHINA_STRING = "神马都是浮云！"; /** * 英文预览的字符串 */ private static final String ENGLISH_STRING = "Hello Kitty！"; /** * 数字预览的字符串 */ private static final String NUMBER_STRING = "0123456789"; // 预设字体，也是将来要返回的字体 private Font font = null; // 字体选择器组件容器 private Box box = null; // 字体文本框 private JTextField fontText = null; // 样式文本框 private JTextField styleText = null; // 文字大小文本框 private JTextField sizeText = null; // 预览文本框 private JTextField previewText = null; // 中文预览 private JRadioButton chinaButton = null; // 英文预览 private JRadioButton englishButton = null; // 数字预览 private JRadioButton numberButton = null; // 字体选择框 private JList fontList = null; // 样式选择器 private JList styleList = null; // 文字大小选择器 private JList sizeList = null; // 确定按钮 private JButton approveButton = null; // 取消按钮 private JButton cancelButton = null; // 所有字体 private String [] fontArray = null; // 所有样式 private String [] styleArray = {"常规", "粗体", "斜体", "粗斜体"}; // 所有预设字体大小 private String [] sizeArray = {"8", "9", "10", "11", "12", "14", "16", "18", "20", "22", "24", "26", "28", "36", "48", "初号", "小初", "一号", "小一", "二号", "小二", "三号", "小三", "四号", "小四", "五号", "小五", "六号", "小六", "七号", "八号"}; // 上面数组中对应的字体大小 private int [] sizeIntArray = {8, 9, 10, 11, 12, 14, 16, 18, 20, 22, 24, 26, 28, 36, 48, 42, 36, 26, 24, 22, 18, 16, 15, 14, 12, 10, 9, 8, 7, 6, 5}; // 返回的数值，默认取消 private int returnValue = CANCEL_OPTION; /** * 体构造一个字体选择器 */ public MyFont() { this(new Font("宋体", Font.PLAIN, 12)); } /** * 使用给定的预设字体构造一个字体选择器 * @param font 字体 */ public MyFont(Font font) { setTitle("字体选择器"); this.font = font; // 初始化UI组件 init(); // 添加监听器 addListener(); // 按照预设字体显示 setup(); // 基本设置 setModal(true); setResizable(false); // 自适应大小 pack(); } /** * 初始化组件 */ private void init(){ // 获得系统字体 GraphicsEnvironment eq = GraphicsEnvironment.getLocalGraphicsEnvironment(); fontArray = eq.getAvailableFontFamilyNames(); // 主容器 box = Box.createVerticalBox(); box.setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8)); fontText = new JTextField(); fontText.setEditable(false); fontText.setBackground(Color.WHITE); styleText = new JTextField(); styleText.setEditable(false); styleText.setBackground(Color.WHITE); sizeText = new JTextField("12"); // 给文字大小文本框使用的Document文档，制定了一些输入字符的规则 Document doc = new PlainDocument(){ public void insertString(int offs, String str, AttributeSet a) throws BadLocationException { if (str == null) { return; } if (getLength() >= 3) { return; } if (!str.matches("[0-9]+") && !str.equals("初号") && !str.equals("小初") && !str.equals("一号") && !str.equals("小一") && !str.equals("二号") && !str.equals("小二") && !str.equals("三号") && !str.equals("小三") && !str.equals("四号") && !str.equals("小四") && !str.equals("五号") && !str.equals("小五") && !str.equals("六号") && !str.equals("小六") && !str.equals("七号") && !str.equals("八号")) { return; } super.insertString(offs, str, a); sizeList.setSelectedValue(sizeText.getText(), true); } }; sizeText.setDocument(doc); previewText = new JTextField(20); previewText.setHorizontalAlignment(JTextField.CENTER); previewText.setEditable(false); previewText.setBackground(Color.WHITE); chinaButton = new JRadioButton("中文预览", true); englishButton = new JRadioButton("英文预览"); numberButton = new JRadioButton("数字预览"); ButtonGroup bg = new ButtonGroup(); bg.add(chinaButton); bg.add(englishButton); bg.add(numberButton); fontList = new JList(fontArray); styleList = new JList(styleArray); sizeList = new JList(sizeArray); approveButton = new JButton("确定"); cancelButton = new JButton("取消"); Box box1 = Box.createHorizontalBox(); JLabel l1 = new JLabel("字体:"); JLabel l2 = new JLabel("字形:"); JLabel l3 = new JLabel("大小:"); l1.setPreferredSize(new Dimension(165, 14)); l1.setMaximumSize(new Dimension(165, 14)); l1.setMinimumSize(new Dimension(165, 14)); l2.setPreferredSize(new Dimension(95, 14)); l2.setMaximumSize(new Dimension(95, 14)); l2.setMinimumSize(new Dimension(95, 14)); l3.setPreferredSize(new Dimension(80, 14)); l3.setMaximumSize(new Dimension(80, 14)); l3.setMinimumSize(new Dimension(80, 14)); box1.add(l1); box1.add(l2); box1.add(l3); Box box2 = Box.createHorizontalBox(); fontText.setPreferredSize(new Dimension(160, 20)); fontText.setMaximumSize(new Dimension(160, 20)); fontText.setMinimumSize(new Dimension(160, 20)); box2.add(fontText); box2.add(Box.createHorizontalStrut(5)); styleText.setPreferredSize(new Dimension(90, 20)); styleText.setMaximumSize(new Dimension(90, 20)); styleText.setMinimumSize(new Dimension(90, 20)); box2.add(styleText); box2.add(Box.createHorizontalStrut(5)); sizeText.setPreferredSize(new Dimension(80, 20)); sizeText.setMaximumSize(new Dimension(80, 20)); sizeText.setMinimumSize(new Dimension(80, 20)); box2.add(sizeText); Box box3 = Box.createHorizontalBox(); JScrollPane sp1 = new JScrollPane(fontList); sp1.setPreferredSize(new Dimension(160, 100)); sp1.setMaximumSize(new Dimension(160, 100)); sp1.setMaximumSize(new Dimension(160, 100)); box3.add(sp1); box3.add(Box.createHorizontalStrut(5)); JScrollPane sp2 = new JScrollPane(styleList); sp2.setPreferredSize(new Dimension(90, 100)); sp2.setMaximumSize(new Dimension(90, 100)); sp2.setMinimumSize(new Dimension(90, 100)); box3.add(sp2); box3.add(Box.createHorizontalStrut(5)); JScrollPane sp3 = new JScrollPane(sizeList); sp3.setPreferredSize(new Dimension(80, 100)); sp3.setMaximumSize(new Dimension(80, 100)); sp3.setMinimumSize(new Dimension(80, 100)); box3.add(sp3); Box box4 = Box.createHorizontalBox(); Box box5 = Box.createVerticalBox(); JPanel box6 = new JPanel(new BorderLayout()); box5.setBorder(BorderFactory.createTitledBorder("字符集")); box6.setBorder(BorderFactory.createTitledBorder("示例")); box5.add(chinaButton); box5.add(englishButton); box5.add(numberButton); box5.setPreferredSize(new Dimension(90, 95)); box5.setMaximumSize(new Dimension(90, 95)); box5.setMinimumSize(new Dimension(90, 95)); box6.add(previewText); box6.setPreferredSize(new Dimension(250, 95)); box6.setMaximumSize(new Dimension(250, 95)); box6.setMinimumSize(new Dimension(250, 95)); box4.add(box5); box4.add(Box.createHorizontalStrut(4)); box4.add(box6); Box box7 = Box.createHorizontalBox(); box7.add(Box.createHorizontalGlue()); box7.add(approveButton); box7.add(Box.createHorizontalStrut(5)); box7.add(cancelButton); box.add(box1); box.add(box2); box.add(box3); box.add(Box.createVerticalStrut(5)); box.add(box4); box.add(Box.createVerticalStrut(5)); box.add(box7); getContentPane().add(box); } /** * 按照预设字体显示 */ private void setup() { String fontName = font.getFamily(); int fontStyle = font.getStyle(); int fontSize = font.getSize(); /* * 如果预设的文字大小在选择列表中，则通过选择该列表中的某项进行设值，否则直接将预设文字大小写入文本框 */ boolean b = false; for (int i = 0; i < sizeArray.length; i++) { if (sizeArray[i].equals(String.valueOf(fontSize))) { b = true; break; } } if(b){ // 选择文字大小列表中的某项 sizeList.setSelectedValue(String.valueOf(fontSize), true); }else{ sizeText.setText(String.valueOf(fontSize)); } // 选择字体列表中的某项 fontList.setSelectedValue(fontName, true); // 选择样式列表中的某项 styleList.setSelectedIndex(fontStyle); // 预览默认显示中文字符 chinaButton.doClick(); // 显示预览 setPreview(); } /** * 添加所需的事件监听器 */ private void addListener() { sizeText.addFocusListener(new FocusListener() { public void focusLost(FocusEvent e) { setPreview(); } public void focusGained(FocusEvent e) { sizeText.selectAll(); } }); // 字体列表发生选择事件的监听器 fontList.addListSelectionListener(new ListSelectionListener() { public void valueChanged(ListSelectionEvent e) { if (!e.getValueIsAdjusting()) { fontText.setText(String.valueOf(fontList.getSelectedValue())); // 设置预览 setPreview(); } } }); styleList.addListSelectionListener(new ListSelectionListener() { public void valueChanged(ListSelectionEvent e) { if (!e.getValueIsAdjusting()) { styleText.setText(String.valueOf(styleList.getSelectedValue())); // 设置预览 setPreview(); } } }); sizeList.addListSelectionListener(new ListSelectionListener() { public void valueChanged(ListSelectionEvent e) { if (!e.getValueIsAdjusting()) { if(!sizeText.isFocusOwner()){ sizeText.setText(String.valueOf(sizeList.getSelectedValue())); } // 设置预览 setPreview(); } } }); // 编码监听器 EncodeAction ea = new EncodeAction(); chinaButton.addActionListener(ea); englishButton.addActionListener(ea); numberButton.addActionListener(ea); // 确定按钮的事件监听 approveButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { // 组合字体 font = groupFont(); // 设置返回值 returnValue = APPROVE_OPTION; // 关闭窗口 disposeDialog(); } }); // 取消按钮事件监听 cancelButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { disposeDialog(); } }); } /** * 显示字体选择器 * @param owner 上层所有者 * @return 该整形返回值表示用户点击了字体选择器的确定按钮或取消按钮，参考本类常量字段APPROVE_OPTION和CANCEL_OPTION */ public final int showFontDialog(JFrame owner) { setLocationRelativeTo(owner); setVisible(true); return returnValue; } /** * 返回选择的字体对象 * @return 字体对象 */ public final Font getSelectFont() { return font; } /** * 关闭窗口 */ private void disposeDialog() { MyFont.this.removeAll(); MyFont.this.dispose(); } /** * 显示错误消息 * @param errorMessage 错误消息 */ private void showErrorDialog(String errorMessage) { JOptionPane.showMessageDialog(this, errorMessage, "错误", JOptionPane.ERROR_MESSAGE); } /** * 设置预览 */ private void setPreview() { Font f = groupFont(); previewText.setFont(f); } /** * 按照选择组合字体 * @return 字体 */ private Font groupFont() { String fontName = fontText.getText(); int fontStyle = styleList.getSelectedIndex(); String sizeStr = sizeText.getText().trim(); // 如果没有输入 if(sizeStr.length() == 0) { showErrorDialog("字体（大小）必须是有效“数值！"); return null; } int fontSize = 0; // 通过循环对比文字大小输入是否在现有列表内 for (int i = 0; i < sizeArray.length; i++) { if(sizeStr.equals(sizeArray[i])){ fontSize = sizeIntArray[i]; break; } } // 没有在列表内 if (fontSize == 0) { try{ fontSize = Integer.parseInt(sizeStr); if(fontSize < 1){ showErrorDialog("字体（大小）必须是有效“数值”！"); return null; } }catch (NumberFormatException nfe) { showErrorDialog("字体（大小）必须是有效“数值”！"); return null; } } return new Font(fontName, fontStyle, fontSize); } /** * 编码选择事件的监听动作 * */ class EncodeAction implements ActionListener { public void actionPerformed(ActionEvent e) { if (e.getSource().equals(chinaButton)) { previewText.setText(CHINA_STRING); } else if (e.getSource().equals(englishButton)) { previewText.setText(ENGLISH_STRING); } else { previewText.setText(NUMBER_STRING); } } } } 阅读全文
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