效果图：
首先，要对编写的程序进行分析，记事本由5大模块组成，第一个就是文件类，其下包含新建，打开，保存，另存为，退出，编辑类包含全部，剪切，粘贴，复制，格式包含自动换行和字体，查看包含状态栏，帮助关于作者信息。
其次对框架结构进行整理
可用6个类表示，即记事本的主菜单MainMenu，包括页面上的所有按钮
记事本的主程序（NotebookMain），字体部分对象（FontDialog），编码（Unicode），主面板（MainFrame）文件管理框架（FileOperator）
主程序NotebookMain
import javax.swing.*;
class Notebookmain {
public static void main(String[] args) {
try {
String lookAndFeel = UIManager.getSystemLookAndFeelClassName();
UIManager.setLookAndFeel(lookAndFeel);//异常
}catch (Exception e) {}
MainFrame myFrame = new MainFrame();
myFrame.setVisible(true);
}
}字体部分对象（FontDialog）
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.border.*;
public class FontDialog extends JDialog {
private static final long serialVersionUID = 1L;
private static Font resultFont = null;
JList listFontName, listFontStyle, listFontSize, listFontColor;
JTextField editFontName, editFontStyle, editFontSize, editFontColor;
String demoString;
JLabel labelExample;
JButton btnOK, btnCancel;
Color[] colorArray = {Color.BLACK, Color.BLUE, Color.CYAN, Color.DARK_GRAY,
Color.GRAY, Color.GREEN, Color.LIGHT_GRAY, Color.MAGENTA,
Color.ORANGE, Color.PINK, Color.RED, Color.WHITE, Color.YELLOW};
String[] colorNameArray = {"BLACK", "BLUE", "CYAN", "DARK_GRAY", "GRAY",
"GREEN", "LIGHT_GRAY", "MAGENTA", "ORANGE", "PINK", "RED", "WHITE",
"YELLOW"};
private JFrame frame;
public FontDialog(JFrame owner, String title, boolean modal) {
super(owner, title, modal);
Container container = getContentPane();
container.setLayout(new BorderLayout());
this.frame = owner;
setLocationRelativeTo(owner);
JPanel panelMain = new JPanel();
panelMain.setLayout(new GridLayout(2, 1));
JPanel panelFontSet, panelFontView;
panelFontSet = new JPanel(new GridLayout(1, 4));
panelFontView = new JPanel(new GridLayout(1, 2));
demoString = "AaBbCcDdEe";
labelExample = new JLabel(demoString, JLabel.CENTER);
labelExample.setBackground(Color.WHITE);
ListSelectionListener selectionListener = new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
if (((JList) e.getSource()).getName().equals("listFontName")) {
editFontName.setText((String) listFontName.getSelectedValue());
labelExample.setFont(new Font(editFontName.getText(), labelExample.getFont().getStyle(), labelExample.getFont().getSize()));
}
if (((JList) e.getSource()).getName().equals("listFontStyle")) {
editFontStyle.setText((String) listFontStyle.getSelectedValue());
labelExample.setFont(new Font(labelExample.getFont().getFontName(), listFontStyle.getSelectedIndex(), labelExample.getFont().getSize()));
}
if (((JList) e.getSource()).getName().equals("listFontSize")) {
editFontSize.setText((String) listFontSize.getSelectedValue());
try {
Integer.parseInt(editFontSize.getText());
} catch (Exception excepInt) {
editFontSize.setText(labelExample.getFont().getSize() + "");
}
labelExample.setFont(new Font(labelExample.getFont().getFontName(), labelExample.getFont().getStyle(), Integer.parseInt(editFontSize.getText())));
}
if (((JList) e.getSource()).getName().equals("listFontColor")) {
editFontColor.setText(colorNameArray[listFontColor.getSelectedIndex()]);
labelExample.setForeground(colorArray[listFontColor.getSelectedIndex()]);
}
}
};
KeyListener keyListener = new KeyListener() {
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == 10) {
if (((JTextField) e.getSource()).getName().equals("listFontName")) {
labelExample.setFont(new Font(editFontName.getText(), labelExample.getFont().getStyle(), labelExample.getFont().getSize()));
}
if (((JTextField) e.getSource()).getName().equals("listFontStyle")) {
editFontStyle.setText((String) listFontStyle.getSelectedValue());
labelExample.setFont(new Font(labelExample.getFont().getFontName(), listFontStyle.getSelectedIndex(), labelExample.getFont().getSize()));
}
if (((JTextField) e.getSource()).getName().equals("listFontSize")) {
try {
Integer.parseInt(editFontSize.getText());
} catch (Exception excepInt) {
editFontSize.setText(labelExample.getFont().getSize() + "");
}
labelExample.setFont(new Font(labelExample.getFont().getFontName(), labelExample.getFont().getStyle(), Integer.parseInt(editFontSize.getText())));
}
}
}
public void keyReleased(KeyEvent e) {
}
public void keyTyped(KeyEvent e) {
}
};
JPanel panelFontName = new JPanel();
Border border = BorderFactory.createLoweredBevelBorder();
border = BorderFactory.createTitledBorder(border, "字体");
panelFontName.setBorder(border);
Font[] fontArray = java.awt.GraphicsEnvironment
.getLocalGraphicsEnvironment().getAllFonts();
int fontArrayCount = fontArray.length;
String[] fontNameArray = new String[fontArrayCount];
for (int i = 0; i < fontArrayCount; i++) {
fontNameArray[i] = fontArray[i].getName();
}
listFontName = new JList(fontNameArray);
listFontName.setName("listFontName");
listFontName.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
listFontName.addListSelectionListener(selectionListener);
listFontName.setVisibleRowCount(6);
editFontName = new JTextField(fontNameArray[0]);
editFontName.setName("editFontName");
editFontName.addKeyListener(keyListener);
JScrollPane jspFontName = new JScrollPane(listFontName);
panelFontName.setLayout(new BoxLayout(panelFontName, BoxLayout.PAGE_AXIS));
panelFontName.add(editFontName);
panelFontName.add(jspFontName);
// 样式
JPanel panelFontstyle = new JPanel();
border = BorderFactory.createLoweredBevelBorder();
border = BorderFactory.createTitledBorder(border, "样式");
panelFontstyle.setBorder(border);
String[] fontStylesArray = {"PLAIN", "BOLD", "ITALIC", "BOLD ITALIC"};
listFontStyle = new JList(fontStylesArray);
listFontStyle.setName("listFontStyle");
listFontStyle.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
listFontStyle.addListSelectionListener(selectionListener);
listFontStyle.setVisibleRowCount(6);
editFontStyle = new JTextField(fontStylesArray[0]);
editFontStyle.setName("listFontStyle");
editFontStyle.addKeyListener(keyListener);
JScrollPane jspFontStyle = new JScrollPane(listFontStyle);
panelFontstyle.setLayout(new BoxLayout(panelFontstyle, BoxLayout.PAGE_AXIS));
panelFontstyle.add(editFontStyle);
panelFontstyle.add(jspFontStyle);
// 大小
JPanel panelFontSize = new JPanel();
border = BorderFactory.createLoweredBevelBorder();
border = BorderFactory.createTitledBorder(border, "大小");
panelFontSize.setBorder(border);
String[] fontSizeArray = {"10", "14", "18", "22", "26", "30"};
listFontSize = new JList(fontSizeArray);
listFontSize.setName("listFontSize");
listFontSize.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
listFontSize.addListSelectionListener(selectionListener);
listFontSize.setVisibleRowCount(6);
editFontSize = new JTextField(fontSizeArray[0]);
editFontSize.setName("listFontSize");
editFontSize.addKeyListener(keyListener);
JScrollPane jspFontSize = new JScrollPane(listFontSize);
panelFontSize.setLayout(new BoxLayout(panelFontSize, BoxLayout.PAGE_AXIS));
panelFontSize.add(editFontSize);
panelFontSize.add(jspFontSize);
// 颜色
JPanel panelFontColor = new JPanel();
Border borderColor = BorderFactory.createLoweredBevelBorder();
borderColor = BorderFactory.createTitledBorder(borderColor, "颜色");
panelFontColor.setBorder(borderColor);
listFontColor = new JList(colorNameArray);
listFontColor.setName("listFontColor");
listFontColor.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
listFontColor.addListSelectionListener(selectionListener);
listFontColor.setVisibleRowCount(6);
editFontColor = new JTextField(colorNameArray[0].toString());
editFontColor.setName("editFontColor");
editFontColor.addKeyListener(keyListener);
JScrollPane jspFontColor = new JScrollPane(listFontColor);
panelFontColor.setLayout(new BoxLayout(panelFontColor, BoxLayout.PAGE_AXIS));
panelFontColor.add(editFontColor);
panelFontColor.add(jspFontColor);
panelFontSet.add(panelFontName);
panelFontSet.add(panelFontstyle);//字体风格
panelFontSet.add(panelFontSize);//字体的格式，粗细倾斜之类
panelFontSet.add(panelFontColor);//字体颜色
panelFontView.add(labelExample);
panelMain.add(panelFontSet);
panelMain.add(panelFontView);
JPanel panelButton = new JPanel();
panelButton.setLayout(new FlowLayout());
btnOK = new JButton("确定");
btnCancel = new JButton("取消");
panelButton.add(btnOK);
panelButton.add(btnCancel);
btnOK.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
resultFont = labelExample.getFont();
FontDialog.this.setVisible(false);
}
});
btnCancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
resultFont = null;
FontDialog.this.setVisible(false);
}
});
container.add(panelMain, BorderLayout.CENTER);
container.add(panelButton, BorderLayout.SOUTH);
setSize(400, 300);
this.setVisible(true);
}
public static Font showDialog(JFrame owner, Font font) {
FontDialog fontDialog = new FontDialog(owner, "字体设置", true);
fontDialog.setVisible(true);
return resultFont;
}
}文件管理框架（FileOperator）
import java.io.*;
import javax.swing.*;
import javax.swing.filechooser.FileFilter;
public class FileOperator {
public static void main(String[] args) {
System.out.println(selectFile("",JFileChooser.SAVE_DIALOG));
}
//打开文件对话框，返回已选择的文件名
public static String selectFile(String pathFileName,int dialogType) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch(Exception e) {
//...
}
// 创建文件选择器
JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);//只允许选择文件
fileChooser.setMultiSelectionEnabled(false);//不允许多选
// 设置当前目录
if (!pathFileName.equals(""))
fileChooser.setCurrentDirectory(new File(pathFileName));
fileChooser.setAcceptAllFileFilterUsed(false);//先取消文件过滤器
final String[][] fileExtNames = {
{".cvs", "CVS文件(*.cvs)"},
{".txt", "文本文档(*.txt)"}
};
// 显示所有文件
fileChooser.addChoosableFileFilter(new FileFilter() {
public boolean accept(File file) {
return true;
}
public String getDescription() {
return "所有文件(*.*)";
}
});
// 循环添加需要显示的文件
for (final String[] fileExtName : fileExtNames) {
fileChooser.setFileFilter(new FileFilter() {
public boolean accept(File file) {
if (file.getName().toLowerCase().endsWith(fileExtName[0]) || file.isDirectory()) {
return true;
}
return false;
}
public String getDescription() {
return fileExtName[1];
}
});
}
fileChooser.setDialogType(dialogType);
if (fileChooser.showDialog(null,null) ==JFileChooser.APPROVE_OPTION) {
return fileChooser.getSelectedFile().getPath();
} else {
return "";//没有选择文件，比如取消了
}
}
public static String readTxt(String path) {
StringBuilder content = new StringBuilder("");
try {
String fileCharsetName = getFileCharsetName(path);
//System.out.println("文件的编码格式为："+fileCharsetName);
InputStream is = new FileInputStream(path);
//必须保证此处文件编码判断无误
InputStreamReader isr = new InputStreamReader(is, fileCharsetName);
BufferedReader br = new BufferedReader(isr);
BufferedReader br2 = new BufferedReader(isr);
String str = "";
boolean isFirst = true;
long start2 = System.currentTimeMillis();
while (null != (str = br.readLine())) {
if (!isFirst)
content.append(System.lineSeparator());
else
isFirst = false;
content.append(str);
}
long end2 = System.currentTimeMillis();
System.out.println("charArray:"+(end2-start2));
br.close();
} catch (Exception e) {
e.printStackTrace();
System.err.println("读取文件:" + path + "失败!");
}
return content.toString();
}
public static boolean writeTxt(String path,String fileContent,String fileCharsetName) {
boolean saveOK = false;
try {
OutputStream os = new FileOutputStream(path);
//必须保证此处文件编码判断无误
OutputStreamWriter osr = new OutputStreamWriter(os, fileCharsetName);
BufferedWriter wr = new BufferedWriter(osr);
wr.write(fileContent);
wr.close();
saveOK = true;
} catch (Exception e) {
System.err.println("文件存盘失败:" + path + "失败!"+e.getMessage());
}
return saveOK;
}
public static String getFileCharsetName(String fileName) throws IOException {
String code = "UTF-8";
try {
code = EncodeUtils.getEncode(fileName, true);
System.out.println(code);
}catch (Exception e) {
e.printStackTrace();
}
return code;
}
}编码（Unicode）
import java.io.*;
import java.util.BitSet;
public class EncodeUtils {
private static int BYTE_SIZE = 8;
public static String CODE_UTF8 = "UTF-8";
public static String CODE_UTF8_BOM = "UTF-8_BOM";
public static String CODE_GBK = "GBK";
public static String getEncode(String fullFileName, boolean ignoreBom) throws Exception {
//log.debug("fullFileName ; {}", fullFileName);
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(fullFileName));
return getEncode(bis, ignoreBom);
}
public static String getEncode(BufferedInputStream bis, boolean ignoreBom) throws Exception {
bis.mark(0);
String encodeType = "";
byte[] head = new byte[3];
bis.read(head);
if (head[0] == -1 && head[1] == -2) {
encodeType = "UTF-16";
} else if (head[0] == -2 && head[1] == -1) {
encodeType = "Unicode";
} else if (head[0] == -17 && head[1] == -69 && head[2] == -65) { //带BOM
if (ignoreBom) {
encodeType = CODE_UTF8;
} else {
encodeType = CODE_UTF8_BOM;
}
} else if ("Unicode".equals(encodeType)) {
encodeType = "UTF-16";
} else if (isUTF8(bis)) {
encodeType = CODE_UTF8;
} else {
encodeType = CODE_GBK;
}
return encodeType;
}
private static boolean isUTF8(BufferedInputStream bis) throws Exception {
bis.reset();
//读取第一个字节
int code = bis.read();
do {
BitSet bitSet = convert2BitSet(code);
//判断是否为单字节
if (bitSet.get(0)) {//多字节时，再读取N个字节
if (!checkMultiByte(bis, bitSet)) {//未检测通过,直接返回
return false;
}
} else {
//单字节时什么都不用做，再次读取字节
}
code = bis.read();
} while (code != -1);
return true;
}
private static boolean checkMultiByte(BufferedInputStream bis, BitSet bitSet) throws Exception {
int count = getCountOfSequential(bitSet);
byte[] bytes = new byte[count - 1];
bis.read(bytes);
for (byte b : bytes) {
if (!checkUtf8Byte(b)) {
return false;
}
}
return true;
}
private static boolean checkUtf8Byte(byte b) throws Exception {
BitSet bitSet = convert2BitSet(b);
return bitSet.get(0) && !bitSet.get(1);
}
private static int getCountOfSequential(BitSet bitSet) {
int count = 0;
for (int i = 0; i < BYTE_SIZE; i++) {
if (bitSet.get(i)) {
count++;
} else {
break;
}
}
return count;
}
private static BitSet convert2BitSet(int code) {
BitSet bitSet = new BitSet(BYTE_SIZE);
for (int i = 0; i < BYTE_SIZE; i++) {
int tmp3 = code >> (BYTE_SIZE - i - 1);
int tmp2 = 0x1 & tmp3;
if (tmp2 == 1) {
bitSet.set(i);
}
}
return bitSet;
}
public static void convert(String oldFullFileName, String oldCharsetName, String newFullFileName, String newCharsetName) throws Exception {
StringBuffer content = new StringBuffer();
BufferedReader bin = new BufferedReader(new InputStreamReader(new FileInputStream(oldFullFileName), oldCharsetName));
String line;
while ((line = bin.readLine()) != null) {
content.append(line);
content.append(System.getProperty("line.separator"));
}
newFullFileName = newFullFileName.replace("\\", "/");
File dir = new File(newFullFileName.substring(0, newFullFileName.lastIndexOf("/")));
if (!dir.exists()) {
dir.mkdirs();
}
Writer out = new OutputStreamWriter(new FileOutputStream(newFullFileName), newCharsetName);
out.write(content.toString());
}
}主面板（MainFrame）
import javax.swing.*;
import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Modifier;
/**主页面**/
public class MainMenu {
private JFrame mainFrame = null;
private JTextArea textArea = null;
private String currentFileCharset = "UTF-8";//当前文件字符编码
private String currentFileName = ""; //当前文件名
private boolean isModified = false;//文件是否已修改
public Clipboard clipboard = new Clipboard("系统剪切板");//剪贴板
public boolean isModified() {
return isModified;
}
public void setModified(boolean modified) {
isModified = modified;
}
public void setCurrentFileCharset(String currentFileCharset) {
this.currentFileCharset = currentFileCharset;
}
public String getCurrentFileCharset() {
return currentFileCharset;
}
public MainMenu(JFrame owner, JTextArea textArea) {
this.mainFrame = owner;
this.textArea = textArea;
initMenu();
}
private void initMenu() {
JMenuBar menubar = new JMenuBar();//菜单条栏、菜单条：它是菜单的容器
JMenu menuFile = new JMenu("文件(F)");
JMenu menuEdit = new JMenu("编辑(E)");
JMenu menuFormat = new JMenu("格式(O)");
JMenu menuView = new JMenu("查看(V)");
JMenu menuHelp = new JMenu("帮助(H)");
menuFile.setMnemonic('F'); //设置菜单的热键为字母键F，需按下Alt键和字母键F
menuEdit.setMnemonic('E');
menuFormat.setMnemonic('O');
menuView.setMnemonic('V');
menuHelp.setMnemonic('H');
menubar.add(menuFile); //把主菜单条加入菜单栏容器中
menubar.add(menuEdit);
menubar.add(menuFormat);
menubar.add(menuView);
menubar.add(menuHelp);
/**文件的开始菜单**/
JMenuItem miNew = new JMenuItem("新建(N)");
miNew.setMnemonic('O');
miNew.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, InputEvent.CTRL_MASK)); //设置快捷键Ctrl_N
miNew.addActionListener(this::menuFileActionPerformed);
JMenuItem miOpen = new JMenuItem("打开(O)");
miOpen.setMnemonic('O');
miOpen.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, InputEvent.CTRL_MASK)); //设置快捷键Ctrl_O
miOpen.addActionListener(this::menuFileActionPerformed);
JMenuItem miSave=new JMenuItem("保存(S)");
miSave.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_MASK)); //设置快捷键Ctrl_S
miSave.addActionListener(this::menuFileActionPerformed);
JMenuItem miSaveAs = new JMenuItem("另存为(A)");
miSaveAs.addActionListener(this::menuFileActionPerformed);
JMenuItem miExit=new JMenuItem("退出(X)");
miExit.addActionListener(this::menuFileActionPerformed);
menuFile.add(miNew);
menuFile.add(miOpen);
menuFile.add(miSave);
menuFile.add(miSaveAs);
menuFile.addSeparator(); //分隔线
menuFile.add(miExit);
/**文件end**/
//---------------------------BEGIN 【编辑】菜单-----------------------//
JMenuItem miSelectAll = new JMenuItem("全选(A)");
miSelectAll.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A,InputEvent.CTRL_MASK));
miSelectAll.addActionListener(this::menuEditActionPerformed);
JMenuItem miCut=new JMenuItem("剪切(X)");
miCut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,InputEvent.CTRL_MASK));
miCut.addActionListener(this::menuEditActionPerformed);
JMenuItem miCopy = new JMenuItem("复制(C)");
miCopy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_MASK));
miCopy.addActionListener(this::menuEditActionPerformed);
JMenuItem miPaste=new JMenuItem("粘贴(V)");
miPaste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,InputEvent.CTRL_MASK));
miPaste.addActionListener(this::menuEditActionPerformed);
menuEdit.add(miSelectAll);
menuEdit.addSeparator();
menuEdit.add(miCut);
menuEdit.add(miCopy);
menuEdit.addSeparator();
menuEdit.add(miPaste);
//---------------------------END 【编辑】菜单-----------------------//
//---------------------------BEGIN 【格式】菜单-----------------------//
JCheckBoxMenuItem miAutoLine=new JCheckBoxMenuItem("自动换行(W)");
textArea.setLineWrap(true); //激活自动换行功能
textArea.setWrapStyleWord(true); //激活断行不断字功能
miAutoLine.setState(textArea.getLineWrap());
miAutoLine.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_W, InputEvent.CTRL_MASK));
miAutoLine.addActionListener(this::menuFormatActionPerformed);
JMenuItem miFontSet = new JMenuItem("字体(F)");
miFontSet.setMnemonic('F');
miFontSet.addActionListener(this::menuFormatActionPerformed);
menuFormat.add(miAutoLine);
menuFormat.add(miFontSet);
//---------------------------END 【格式】菜单-----------------------//
//---------------------------BEGIN 【查看】菜单-----------------------//
JCheckBoxMenuItem miStatusBar=new JCheckBoxMenuItem("状态栏(S)");
miStatusBar.setMnemonic('S');
miStatusBar.setState(true);
miStatusBar.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent actionEvent) {
((MainFrame)mainFrame).setPanelStatusBarVisible(miStatusBar.getState());
//自已加状态栏自已写
}
});
menuView.add(miStatusBar);
//---------------------------END 【查看】菜单-----------------------//
//---------------------------BEGIN 【帮助】菜单-----------------------//
JMenuItem miHelpContent = new JMenuItem("帮助信息……");
miHelpContent.addActionListener(this::menuHelpActionPerformed);
JMenuItem miAbout = new JMenuItem("关于……");
miAbout.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F1,Modifier.FINAL));
miAbout.addActionListener(this::menuHelpActionPerformed);
menuHelp.add(miHelpContent);
menuHelp.addSeparator();
menuHelp.add(miAbout);
//---------------------------END 【帮助】菜单-----------------------//
mainFrame.setJMenuBar(menubar);
mainFrame.validate();
}
public void menuFileActionPerformed(ActionEvent e) {
if (((JMenuItem)e.getSource()).getText().equals("新建(N)")) {
if (canCloseFile()) {
initVar();
}
}
else if (((JMenuItem)e.getSource()).getText().equals("打开(O)")) {
if (canCloseFile()) {
openFile();
}
}
else if (((JMenuItem)e.getSource()).getText().equals("保存(S)")) {
//System.out.println(currentFileCharset);
saveFile(currentFileName);
}
else if (((JMenuItem)e.getSource()).getText().equals("另存为(A)")) {
saveFile("");
}
else if (((JMenuItem)e.getSource()).getText().equals("退出(X)")) {
if (canCloseFile()) {
System.exit(0);
}
}
}
public void menuEditActionPerformed(ActionEvent e) {
if (((JMenuItem)e.getSource()).getText().equals("全选(A)")) {
textArea.selectAll();
}
else if (((JMenuItem)e.getSource()).getText().equals("复制(C)")) {
copy();
}
else if (((JMenuItem)e.getSource()).getText().equals("剪切(X)")) {
cut();
}
else if (((JMenuItem)e.getSource()).getText().equals("粘贴(V)")) {
paste();
}
}
public void menuFormatActionPerformed(ActionEvent e) {
if (((JMenuItem)e.getSource()).getText().equals("自动换行(W)")) {
boolean bl = ((JCheckBoxMenuItem)e.getSource()).getState();
textArea.setLineWrap(bl); //激活自动换行功能
textArea.setWrapStyleWord(bl); //激活断行不断字功能
}
else if (((JMenuItem)e.getSource()).getText().equals("字体(F)")) {
Font myFont = FontDialog.showDialog(mainFrame,textArea.getFont());
if (myFont != null) {
textArea.setFont(myFont);
}
}
}
public void menuHelpActionPerformed(ActionEvent e) {
if (((JMenuItem)e.getSource()).getText().equals("帮助信息……")) {
String str = "某理工大学数计学院\r\n"+
"计算机2102周**\r\n"+
"半月修改";
JOptionPane.showMessageDialog(mainFrame, str,"帮助信息", 1);
}
else if (((JMenuItem)e.getSource()).getText().equals("关于……")) {
String str = "某理工大学\r\n"+
"数计\r\n"+
"计算机2102周**";
JOptionPane.showMessageDialog(mainFrame, str,"关于本程序……", 1);
}
}
public void cut() {
copy();
//标记开始位置
int start = this.textArea.getSelectionStart();
//标记结束位置
int end = this.textArea.getSelectionEnd();
//删除所选段
this.textArea.replaceRange("", start, end);
}
public void copy() {
//拖动选取文本
String temp = textArea.getSelectedText();
//把获取的内容复制到连续字符器，这个类继承了剪贴板接口
StringSelection text = new StringSelection(temp);
//把内容放在剪贴板
this.clipboard.setContents(text, null);
}
public void paste() {
//Transferable接口，把剪贴板的内容转换成数据
Transferable contents = this.clipboard.getContents(this);
//DataFalvor类判断是否能把剪贴板的内容转换成所需数据类型
DataFlavor flavor = DataFlavor.stringFlavor;
//如果可以转换
if (contents.isDataFlavorSupported(flavor)) {
String str;
try {//开始转换
str = (String) contents.getTransferData(flavor);
//如果要粘贴时，鼠标已经选中了一些字符
if (this.textArea.getSelectedText() != null) {
//定位被选中字符的开始位置
int start = this.textArea.getSelectionStart();
//定位被选中字符的末尾位置
int end = this.textArea.getSelectionEnd();
//把粘贴的内容替换成被选中的内容
this.textArea.replaceRange(str, start, end);
} else {
//获取鼠标所在TextArea的位置
int mouse = this.textArea.getCaretPosition();
//在鼠标所在的位置粘贴内容
this.textArea.insert(str, mouse);
}
} catch (UnsupportedFlavorException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
}
}
}
private void initVar() { //初始化变量和文本框
currentFileName = "";
mainFrame.setTitle("记事本");
isModified = false;
currentFileCharset = "UTF-8";
textArea.setText("");
}
private boolean openFile() {
boolean isSucessed = false;
String fn = FileOperator.selectFile(currentFileName,JFileChooser.OPEN_DIALOG);
if (fn.equals("")) {
return false;
}
try {
String content = FileOperator.readTxt(fn);
textArea.setText(content);
currentFileName = fn;
currentFileCharset = FileOperator.getFileCharsetName(fn);
((MainFrame)mainFrame).setCurrentFileCharset(currentFileCharset);
isModified = false;
mainFrame.setTitle(new File(currentFileName).getName());
isSucessed = true;
} catch (Exception ex) {
}
return isSucessed;
}
private boolean canCloseFile() {
boolean canClose = true;
if (isModified) {
int n = JOptionPane.showConfirmDialog(null, "文件已修改但未保存，要保存吗?", "确认对话框", JOptionPane.YES_NO_CANCEL_OPTION);
if (n == JOptionPane.YES_OPTION) {
canClose = saveFile(currentFileName);
} else if (n == JOptionPane.NO_OPTION) {
} else {
canClose = false;
}
}
return canClose;
}
private boolean saveFile(String fn) {
String fileName = fn;
if (fileName.equals("")) {
fileName = FileOperator.selectFile(currentFileName, JFileChooser.SAVE_DIALOG);
}
if (fileName.equals("")) {
return false;
}
boolean saveOK = false;
try {
String content = textArea.getText();
saveOK = FileOperator.writeTxt(fileName, content, currentFileCharset);
if (saveOK) { // && !currentFileName.equals(fileName)) {
currentFileName = fileName;
isModified = false;
currentFileCharset = FileOperator.getFileCharsetName(currentFileName);
mainFrame.setTitle(new File(currentFileName).getName());
} else {
JOptionPane.showMessageDialog(null, "文件保存失败！\r\n", "系统提示",JOptionPane.ERROR_MESSAGE);
}
}catch (Exception e) {
}
return saveOK;
}
}主菜单（MainMenu）
import javax.swing.*;
import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Modifier;
/**主页面**/
public class MainMenu {
private JFrame mainFrame = null;
private JTextArea textArea = null;
private String currentFileCharset = "UTF-8";//当前文件字符编码
private String currentFileName = ""; //当前文件名
private boolean isModified = false;//文件是否已修改
public Clipboard clipboard = new Clipboard("系统剪切板");//剪贴板
public boolean isModified() {
return isModified;
}
public void setModified(boolean modified) {
isModified = modified;
}
public void setCurrentFileCharset(String currentFileCharset) {
this.currentFileCharset = currentFileCharset;
}
public String getCurrentFileCharset() {
return currentFileCharset;
}
public MainMenu(JFrame owner, JTextArea textArea) {
this.mainFrame = owner;
this.textArea = textArea;
initMenu();
}
private void initMenu() {
JMenuBar menubar = new JMenuBar();//菜单条栏、菜单条：它是菜单的容器
JMenu menuFile = new JMenu("文件(F)");
JMenu menuEdit = new JMenu("编辑(E)");
JMenu menuFormat = new JMenu("格式(O)");
JMenu menuView = new JMenu("查看(V)");
JMenu menuHelp = new JMenu("帮助(H)");
menuFile.setMnemonic('F'); //设置菜单的热键为字母键F，需按下Alt键和字母键F
menuEdit.setMnemonic('E');
menuFormat.setMnemonic('O');
menuView.setMnemonic('V');
menuHelp.setMnemonic('H');
menubar.add(menuFile); //把主菜单条加入菜单栏容器中
menubar.add(menuEdit);
menubar.add(menuFormat);
menubar.add(menuView);
menubar.add(menuHelp);
/**文件的开始菜单**/
JMenuItem miNew = new JMenuItem("新建(N)");
miNew.setMnemonic('O');
miNew.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, InputEvent.CTRL_MASK)); //设置快捷键Ctrl_N
miNew.addActionListener(this::menuFileActionPerformed);
JMenuItem miOpen = new JMenuItem("打开(O)");
miOpen.setMnemonic('O');
miOpen.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, InputEvent.CTRL_MASK)); //设置快捷键Ctrl_O
miOpen.addActionListener(this::menuFileActionPerformed);
JMenuItem miSave=new JMenuItem("保存(S)");
miSave.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_MASK)); //设置快捷键Ctrl_S
miSave.addActionListener(this::menuFileActionPerformed);
JMenuItem miSaveAs = new JMenuItem("另存为(A)");
miSaveAs.addActionListener(this::menuFileActionPerformed);
JMenuItem miExit=new JMenuItem("退出(X)");
miExit.addActionListener(this::menuFileActionPerformed);
menuFile.add(miNew);
menuFile.add(miOpen);
menuFile.add(miSave);
menuFile.add(miSaveAs);
menuFile.addSeparator(); //分隔线
menuFile.add(miExit);
/**文件end**/
//---------------------------BEGIN 【编辑】菜单-----------------------//
JMenuItem miSelectAll = new JMenuItem("全选(A)");
miSelectAll.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A,InputEvent.CTRL_MASK));
miSelectAll.addActionListener(this::menuEditActionPerformed);
JMenuItem miCut=new JMenuItem("剪切(X)");
miCut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,InputEvent.CTRL_MASK));
miCut.addActionListener(this::menuEditActionPerformed);
JMenuItem miCopy = new JMenuItem("复制(C)");
miCopy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_MASK));
miCopy.addActionListener(this::menuEditActionPerformed);
JMenuItem miPaste=new JMenuItem("粘贴(V)");
miPaste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,InputEvent.CTRL_MASK));
miPaste.addActionListener(this::menuEditActionPerformed);
menuEdit.add(miSelectAll);
menuEdit.addSeparator();
menuEdit.add(miCut);
menuEdit.add(miCopy);
menuEdit.addSeparator();
menuEdit.add(miPaste);
//---------------------------END 【编辑】菜单-----------------------//
//---------------------------BEGIN 【格式】菜单-----------------------//
JCheckBoxMenuItem miAutoLine=new JCheckBoxMenuItem("自动换行(W)");
textArea.setLineWrap(true); //激活自动换行功能
textArea.setWrapStyleWord(true); //激活断行不断字功能
miAutoLine.setState(textArea.getLineWrap());
miAutoLine.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_W, InputEvent.CTRL_MASK));
miAutoLine.addActionListener(this::menuFormatActionPerformed);
JMenuItem miFontSet = new JMenuItem("字体(F)");
miFontSet.setMnemonic('F');
miFontSet.addActionListener(this::menuFormatActionPerformed);
menuFormat.add(miAutoLine);
menuFormat.add(miFontSet);
//---------------------------END 【格式】菜单-----------------------//
//---------------------------BEGIN 【查看】菜单-----------------------//
JCheckBoxMenuItem miStatusBar=new JCheckBoxMenuItem("状态栏(S)");
miStatusBar.setMnemonic('S');
miStatusBar.setState(true);
miStatusBar.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent actionEvent) {
((MainFrame)mainFrame).setPanelStatusBarVisible(miStatusBar.getState());
//自已加状态栏自已写
}
});
menuView.add(miStatusBar);
//---------------------------END 【查看】菜单-----------------------//
//---------------------------BEGIN 【帮助】菜单-----------------------//
JMenuItem miHelpContent = new JMenuItem("帮助信息……");
miHelpContent.addActionListener(this::menuHelpActionPerformed);
JMenuItem miAbout = new JMenuItem("关于……");
miAbout.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F1,Modifier.FINAL));
miAbout.addActionListener(this::menuHelpActionPerformed);
menuHelp.add(miHelpContent);
menuHelp.addSeparator();
menuHelp.add(miAbout);
//---------------------------END 【帮助】菜单-----------------------//
mainFrame.setJMenuBar(menubar);
mainFrame.validate();
}
public void menuFileActionPerformed(ActionEvent e) {
if (((JMenuItem)e.getSource()).getText().equals("新建(N)")) {
if (canCloseFile()) {
initVar();
}
}
else if (((JMenuItem)e.getSource()).getText().equals("打开(O)")) {
if (canCloseFile()) {
openFile();
}
}
else if (((JMenuItem)e.getSource()).getText().equals("保存(S)")) {
//System.out.println(currentFileCharset);
saveFile(currentFileName);
}
else if (((JMenuItem)e.getSource()).getText().equals("另存为(A)")) {
saveFile("");
}
else if (((JMenuItem)e.getSource()).getText().equals("退出(X)")) {
if (canCloseFile()) {
System.exit(0);
}
}
}
public void menuEditActionPerformed(ActionEvent e) {
if (((JMenuItem)e.getSource()).getText().equals("全选(A)")) {
textArea.selectAll();
}
else if (((JMenuItem)e.getSource()).getText().equals("复制(C)")) {
copy();
}
else if (((JMenuItem)e.getSource()).getText().equals("剪切(X)")) {
cut();
}
else if (((JMenuItem)e.getSource()).getText().equals("粘贴(V)")) {
paste();
}
}
public void menuFormatActionPerformed(ActionEvent e) {
if (((JMenuItem)e.getSource()).getText().equals("自动换行(W)")) {
boolean bl = ((JCheckBoxMenuItem)e.getSource()).getState();
textArea.setLineWrap(bl); //激活自动换行功能
textArea.setWrapStyleWord(bl); //激活断行不断字功能
}
else if (((JMenuItem)e.getSource()).getText().equals("字体(F)")) {
Font myFont = FontDialog.showDialog(mainFrame,textArea.getFont());
if (myFont != null) {
textArea.setFont(myFont);
}
}
}
public void menuHelpActionPerformed(ActionEvent e) {
if (((JMenuItem)e.getSource()).getText().equals("帮助信息……")) {
String str = "某理工大学数计学院\r\n"+
"计算机2102周**\r\n"+
"半月修改";
JOptionPane.showMessageDialog(mainFrame, str,"帮助信息", 1);
}
else if (((JMenuItem)e.getSource()).getText().equals("关于……")) {
String str = "某理工大学\r\n"+
"数计\r\n"+
"计算机2102周**";
JOptionPane.showMessageDialog(mainFrame, str,"关于本程序……", 1);
}
}
public void cut() {
copy();
//标记开始位置
int start = this.textArea.getSelectionStart();
//标记结束位置
int end = this.textArea.getSelectionEnd();
//删除所选段
this.textArea.replaceRange("", start, end);
}
public void copy() {
//拖动选取文本
String temp = textArea.getSelectedText();
//把获取的内容复制到连续字符器，这个类继承了剪贴板接口
StringSelection text = new StringSelection(temp);
//把内容放在剪贴板
this.clipboard.setContents(text, null);
}
public void paste() {
//Transferable接口，把剪贴板的内容转换成数据
Transferable contents = this.clipboard.getContents(this);
//DataFalvor类判断是否能把剪贴板的内容转换成所需数据类型
DataFlavor flavor = DataFlavor.stringFlavor;
//如果可以转换
if (contents.isDataFlavorSupported(flavor)) {
String str;
try {//开始转换
str = (String) contents.getTransferData(flavor);
//如果要粘贴时，鼠标已经选中了一些字符
if (this.textArea.getSelectedText() != null) {
//定位被选中字符的开始位置
int start = this.textArea.getSelectionStart();
//定位被选中字符的末尾位置
int end = this.textArea.getSelectionEnd();
//把粘贴的内容替换成被选中的内容
this.textArea.replaceRange(str, start, end);
} else {
//获取鼠标所在TextArea的位置
int mouse = this.textArea.getCaretPosition();
//在鼠标所在的位置粘贴内容
this.textArea.insert(str, mouse);
}
} catch (UnsupportedFlavorException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
}
}
}
private void initVar() { //初始化变量和文本框
currentFileName = "";
mainFrame.setTitle("记事本");
isModified = false;
currentFileCharset = "UTF-8";
textArea.setText("");
}
private boolean openFile() {
boolean isSucessed = false;
String fn = FileOperator.selectFile(currentFileName,JFileChooser.OPEN_DIALOG);
if (fn.equals("")) {
return false;
}
try {
String content = FileOperator.readTxt(fn);
textArea.setText(content);
currentFileName = fn;
currentFileCharset = FileOperator.getFileCharsetName(fn);
((MainFrame)mainFrame).setCurrentFileCharset(currentFileCharset);
isModified = false;
mainFrame.setTitle(new File(currentFileName).getName());
isSucessed = true;
} catch (Exception ex) {
}
return isSucessed;
}
private boolean canCloseFile() {
boolean canClose = true;
if (isModified) {
int n = JOptionPane.showConfirmDialog(null, "文件已修改但未保存，要保存吗?", "确认对话框", JOptionPane.YES_NO_CANCEL_OPTION);
if (n == JOptionPane.YES_OPTION) {
canClose = saveFile(currentFileName);
} else if (n == JOptionPane.NO_OPTION) {
} else {
canClose = false;
}
}
return canClose;
}
private boolean saveFile(String fn) {
String fileName = fn;
if (fileName.equals("")) {
fileName = FileOperator.selectFile(currentFileName, JFileChooser.SAVE_DIALOG);
}
if (fileName.equals("")) {
return false;
}
boolean saveOK = false;
try {
String content = textArea.getText();
saveOK = FileOperator.writeTxt(fileName, content, currentFileCharset);
if (saveOK) { // && !currentFileName.equals(fileName)) {
currentFileName = fileName;
isModified = false;
currentFileCharset = FileOperator.getFileCharsetName(currentFileName);
mainFrame.setTitle(new File(currentFileName).getName());
} else {
JOptionPane.showMessageDialog(null, "文件保存失败！\r\n", "系统提示",JOptionPane.ERROR_MESSAGE);
}
}catch (Exception e) {
}
return saveOK;
}
}运行结果：
部分功能来源于网络搜集，仅供学习与交流
本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
