用java写一一个简易的记事本

最新推荐文章于 2019-04-25 18:18:40 发布

转载最新推荐文章于 2019-04-25 18:18:40 发布 · 2.8k 阅读

本文介绍了一个基于Java Swing的简易记事本程序，具备基本的文件操作功能，如新建、打开、保存及另存为等，并实现了文本编辑功能，包括撤销、剪切、复制、粘贴和删除等。此外，还提供了字体选择、颜色设置等功能。

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import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.GraphicsEnvironment;
import java.awt.Insets;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JColorChooser;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.undo.UndoManager;
/**
* swing 简单记事本
* @author kissy小强
*
*/
public class Note extends JFrame {
private static final long serialVersionUID = 1L;
UndoManager manager = new UndoManager();
JTextArea text = new JTextArea();
JFileChooser chooser;
String s = "新建记事本";
int result = 0;
private File file;
JMenuBar Mb;
JMenu M1, M2, M3, M4;
JMenuItem m11, m12, m13, m14, m15, m21, m22, m23, m24, m25, m32, m33, m41;
private final static int HEIGHT=450;
private final static int WIDTH=750;
JCheckBoxMenuItem m31 = new JCheckBoxMenuItem("自动换行", true);
public static void main(String args[]) {
String lookAndFeel = UIManager.getSystemLookAndFeelClassName();
try {
UIManager.setLookAndFeel(lookAndFeel);
} catch (ClassNotFoundException | InstantiationException
| IllegalAccessException | UnsupportedLookAndFeelException e1) {
e1.printStackTrace();
}
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Note n = new Note();
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public Note() {
setTitle(s);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
// 离显示屏上边缘x像素，里显示屏左边缘y像素
setLocation(screenSize.width / 2 - WIDTH / 2, screenSize.height / 2- HEIGHT / 2);
setSize(WIDTH, HEIGHT);
setResizable(true); // 窗体是否可变
setVisible(true); // 窗体是否可见
init();
}
private void init(){
Mb = new JMenuBar();
this.setJMenuBar(Mb);
text.getDocument().addUndoableEditListener(manager);// 设置文本框编辑监听（可撤销）
text.setFont(new Font("宋体", Font.PLAIN, 14));
text.setCaretColor(Color.RED);// 光标颜色
text.setSelectedTextColor(Color.RED);// 选中字体颜色
text.setSelectionColor(Color.GREEN);// 选中背景颜色
text.setLineWrap(true); // 是否换行
text.setWrapStyleWord(true); // 是否单词边界换行（即有空白）
text.setMargin(new Insets(3, 5, 3, 5));// 文本区与边框的间距，四个参数分别为上、左、下、右
text.setDragEnabled(true); // 开启或关闭自动拖动处理
add(new JScrollPane(text, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED));
M1 = this.AddBar("文件", Mb);
M2 = this.AddBar("编辑", Mb);
M3 = this.AddBar("格式", Mb);
M4 = this.AddBar("帮助", Mb);
/* 新建选项 */
m11 = this.AddItem("新建", M1);
m11.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
text.setText("");
setTitle(s);
file = null;
}
});
/* 打开选项 */
m12 = this.AddItem("打开", M1);
m12.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
try {
// 设置打开时的默认目录，两种方式
chooser = new JFileChooser("C:\\Users\\xiaozhx\\Desktop");
// chooser.setCurrentDirectory(new File("C:\\Users\\xiaozhx\\Desktop"));
chooser.setFileFilter(new filter());
result = chooser.showOpenDialog(null);
if (result == JFileChooser.APPROVE_OPTION) {
// 点击了打开按钮
file = chooser.getSelectedFile();
int length = (int) file.length();
FileReader reader = new FileReader(file);
char[] ch = new char[length];
reader.read(ch);
reader.close();
text.setText(new String(ch).trim());
setTitle(file.getName());
} else if (result == JFileChooser.CANCEL_OPTION) {
// 点击了取消按钮
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
});
/* 保存选项 */
m13 = this.AddItem("保存", M1);
m13.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
if (file == null)
try {
chooser = new JFileChooser(
"C:\\Users\\xiaozhx\\Desktop");
chooser.setFileFilter(new filter());
result = chooser.showSaveDialog(null);
if (result == JFileChooser.APPROVE_OPTION) {
File selectfile = chooser.getSelectedFile(); // 获得文件名
// 获得被选中的过滤器中的文件扩展名
String end = chooser.getFileFilter().getDescription();
File newFile = null;
if (selectfile.getAbsolutePath().toUpperCase().endsWith(end.toUpperCase())) {
// 如果文件是以选定扩展名结束的，则使用原名
newFile = selectfile;
} else {
// 否则加上选定的扩展名
newFile = new File(selectfile.getAbsolutePath()+ end);
}
try {
if (newFile.exists() == false) {
newFile.createNewFile();
}
FileWriter writer = new FileWriter(newFile);
char[] arry = text.getText().toCharArray();
writer.write(arry);
writer.flush();
writer.close();
setTitle(newFile.getName());
file = newFile;
} catch (IOException e) {
}
} else if (result == JFileChooser.CANCEL_OPTION) {
// 点击了取消按钮
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
else
try {
FileWriter writer = new FileWriter(file);
char[] arry = text.getText().toCharArray();
writer.write(arry);
writer.flush();
writer.close();
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
});
/* 另存为选项 */
m14 = this.AddItem("另存为", M1);
m14.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
try {
chooser = new JFileChooser("C:\\Users\\xiaozhx\\Desktop");
chooser.setFileFilter(new filter());
result = chooser.showSaveDialog(null);
if (result == JFileChooser.APPROVE_OPTION) {
File selectfile = chooser.getSelectedFile(); // 获得文件名
// 获得被选中的过滤器中的文件扩展名
String end = chooser.getFileFilter().getDescription();
File newFile = null;
if (selectfile.getAbsolutePath().toUpperCase().endsWith(end.toUpperCase())) {
// 如果文件是以选定扩展名结束的，则使用原名
newFile = selectfile;
} else {
// 否则加上选定的扩展名
newFile = new File(selectfile.getAbsolutePath()+ end);
}
try {
if (newFile.exists() == false) {
newFile.createNewFile();
}
FileWriter writer = new FileWriter(newFile);
char[] arry = text.getText().toCharArray();
writer.write(arry);
writer.flush();
writer.close();
setTitle(newFile.getName());
file = newFile;
} catch (IOException e) {
}
} else if (result == JFileChooser.CANCEL_OPTION) {
// 点击了取消按钮
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
});
M1.addSeparator(); // 横杆
/* 退出选项 */
m15 = this.AddItem("退出", M1);
m15.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
System.exit(0);
}
});
/* 撤消选项 */
m21 = this.AddItem("撤消", M2);
m21.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
if (manager.canUndo())
manager.undo();
}
});
/* 剪切选项 */
M2.addSeparator();
m22 = this.AddItem("剪切", M2);
m22.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
text.cut();
}
});
/* 复制选项 */
m23 = this.AddItem("复制", M2);
m23.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
text.copy();
}
});
/* 粘贴选项 */
m24 = this.AddItem("粘贴", M2);
m24.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
text.paste();
}
});
/* 删除选项 */
m25 = this.AddItem("删除", M2);
m25.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
text.replaceRange("", text.getSelectionStart(),
text.getSelectionEnd());
}
});
/* 自动换行选项 */
M3.add(m31);
m31.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
if (m31.getState())
text.setLineWrap(true);
else
text.setLineWrap(false);
}
});
/* 字体格式设置选项 */
m32 = this.AddItem("字体选择", M3);
m32.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
GraphicsEnvironment ge = GraphicsEnvironment
.getLocalGraphicsEnvironment();
//获取系统字体
JList<String> fontNames = new JList<String>(ge.getAvailableFontFamilyNames());
int response = JOptionPane.showConfirmDialog(null,
new JScrollPane(fontNames), "请选择字体",
JOptionPane.OK_CANCEL_OPTION);
Object selectedFont = fontNames.getSelectedValue();
if (response == JOptionPane.OK_OPTION && selectedFont != null)
text.setFont(new Font(fontNames.getSelectedValue()
.toString(), Font.PLAIN, 20));
}
});
/* 字体颜色设置选项 */
m33 = this.AddItem("字体颜色", M3);
m33.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
Color color = JColorChooser.showDialog(null, "文字颜色选择",
Color.WHITE);
text.setForeground(color);
}
});
m41 = this.AddItem("关于记事本", M4);
m41.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
JOptionPane.showMessageDialog(null, "记事本\n开发语言：JAVA\n开发者：袁健强",
"关于", JOptionPane.PLAIN_MESSAGE);
}
});
}
/** 文件格式过滤器 **/
private class filter extends javax.swing.filechooser.FileFilter {
public boolean accept(File file) {
String name = file.getName();
name.toLowerCase();
if (name.endsWith(".txt") || file.isDirectory())
return true;
else
return false;
}
public String getDescription() {
return ".txt";
}
}
/** 将菜单项JMenuItem添加到菜单JMenu **/
public JMenuItem AddItem(String name, JMenu menu) {
JMenuItem MI = new JMenuItem(name);
menu.add(MI);
return MI;
}
/** 将菜单JMenu添加到菜栏JMenuBar **/
public JMenu AddBar(String name, JMenuBar mb) {
JMenu Mb = new JMenu(name);
mb.add(Mb);
return Mb;
}
}

import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.GraphicsEnvironment;
import java.awt.Insets;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JColorChooser;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.undo.UndoManager;
/**
* swing 简单记事本
* @author kissy小强
*
*/
public class Note extends JFrame {
private static final long serialVersionUID = 1L;
UndoManager manager = new UndoManager();
JTextArea text = new JTextArea();
JFileChooser chooser;
String s = "新建记事本";
int result = 0;
private File file;
JMenuBar Mb;
JMenu M1, M2, M3, M4;
JMenuItem m11, m12, m13, m14, m15, m21, m22, m23, m24, m25, m32, m33, m41;
private final static int HEIGHT=450;
private final static int WIDTH=750;
JCheckBoxMenuItem m31 = new JCheckBoxMenuItem("自动换行", true);
public static void main(String args[]) {
String lookAndFeel = UIManager.getSystemLookAndFeelClassName();
try {
UIManager.setLookAndFeel(lookAndFeel);
} catch (ClassNotFoundException | InstantiationException
| IllegalAccessException | UnsupportedLookAndFeelException e1) {
e1.printStackTrace();
}
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Note n = new Note();
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public Note() {
setTitle(s);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
// 离显示屏上边缘x像素，里显示屏左边缘y像素
setLocation(screenSize.width / 2 - WIDTH / 2, screenSize.height / 2- HEIGHT / 2);
setSize(WIDTH, HEIGHT);
setResizable(true); // 窗体是否可变
setVisible(true); // 窗体是否可见
init();
}
private void init(){
Mb = new JMenuBar();
this.setJMenuBar(Mb);
text.getDocument().addUndoableEditListener(manager);// 设置文本框编辑监听（可撤销）
text.setFont(new Font("宋体", Font.PLAIN, 14));
text.setCaretColor(Color.RED);// 光标颜色
text.setSelectedTextColor(Color.RED);// 选中字体颜色
text.setSelectionColor(Color.GREEN);// 选中背景颜色
text.setLineWrap(true); // 是否换行
text.setWrapStyleWord(true); // 是否单词边界换行（即有空白）
text.setMargin(new Insets(3, 5, 3, 5));// 文本区与边框的间距，四个参数分别为上、左、下、右
text.setDragEnabled(true); // 开启或关闭自动拖动处理
add(new JScrollPane(text, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED));
M1 = this.AddBar("文件", Mb);
M2 = this.AddBar("编辑", Mb);
M3 = this.AddBar("格式", Mb);
M4 = this.AddBar("帮助", Mb);
/* 新建选项 */
m11 = this.AddItem("新建", M1);
m11.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
text.setText("");
setTitle(s);
file = null;
}
});
/* 打开选项 */
m12 = this.AddItem("打开", M1);
m12.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
try {
// 设置打开时的默认目录，两种方式
chooser = new JFileChooser("C:\\Users\\xiaozhx\\Desktop");
// chooser.setCurrentDirectory(new File("C:\\Users\\xiaozhx\\Desktop"));
chooser.setFileFilter(new filter());
result = chooser.showOpenDialog(null);
if (result == JFileChooser.APPROVE_OPTION) {
// 点击了打开按钮
file = chooser.getSelectedFile();
int length = (int) file.length();
FileReader reader = new FileReader(file);
char[] ch = new char[length];
reader.read(ch);
reader.close();
text.setText(new String(ch).trim());
setTitle(file.getName());
} else if (result == JFileChooser.CANCEL_OPTION) {
// 点击了取消按钮
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
});
/* 保存选项 */
m13 = this.AddItem("保存", M1);
m13.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
if (file == null)
try {
chooser = new JFileChooser(
"C:\\Users\\xiaozhx\\Desktop");
chooser.setFileFilter(new filter());
result = chooser.showSaveDialog(null);
if (result == JFileChooser.APPROVE_OPTION) {
File selectfile = chooser.getSelectedFile(); // 获得文件名
// 获得被选中的过滤器中的文件扩展名
String end = chooser.getFileFilter().getDescription();
File newFile = null;
if (selectfile.getAbsolutePath().toUpperCase().endsWith(end.toUpperCase())) {
// 如果文件是以选定扩展名结束的，则使用原名
newFile = selectfile;
} else {
// 否则加上选定的扩展名
newFile = new File(selectfile.getAbsolutePath()+ end);
}
try {
if (newFile.exists() == false) {
newFile.createNewFile();
}
FileWriter writer = new FileWriter(newFile);
char[] arry = text.getText().toCharArray();
writer.write(arry);
writer.flush();
writer.close();
setTitle(newFile.getName());
file = newFile;
} catch (IOException e) {
}
} else if (result == JFileChooser.CANCEL_OPTION) {
// 点击了取消按钮
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
else
try {
FileWriter writer = new FileWriter(file);
char[] arry = text.getText().toCharArray();
writer.write(arry);
writer.flush();
writer.close();
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
});
/* 另存为选项 */
m14 = this.AddItem("另存为", M1);
m14.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
try {
chooser = new JFileChooser("C:\\Users\\xiaozhx\\Desktop");
chooser.setFileFilter(new filter());
result = chooser.showSaveDialog(null);
if (result == JFileChooser.APPROVE_OPTION) {
File selectfile = chooser.getSelectedFile(); // 获得文件名
// 获得被选中的过滤器中的文件扩展名
String end = chooser.getFileFilter().getDescription();
File newFile = null;
if (selectfile.getAbsolutePath().toUpperCase().endsWith(end.toUpperCase())) {
// 如果文件是以选定扩展名结束的，则使用原名
newFile = selectfile;
} else {
// 否则加上选定的扩展名
newFile = new File(selectfile.getAbsolutePath()+ end);
}
try {
if (newFile.exists() == false) {
newFile.createNewFile();
}
FileWriter writer = new FileWriter(newFile);
char[] arry = text.getText().toCharArray();
writer.write(arry);
writer.flush();
writer.close();
setTitle(newFile.getName());
file = newFile;
} catch (IOException e) {
}
} else if (result == JFileChooser.CANCEL_OPTION) {
// 点击了取消按钮
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
});
M1.addSeparator(); // 横杆
/* 退出选项 */
m15 = this.AddItem("退出", M1);
m15.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
System.exit(0);
}
});
/* 撤消选项 */
m21 = this.AddItem("撤消", M2);
m21.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
if (manager.canUndo())
manager.undo();
}
});
/* 剪切选项 */
M2.addSeparator();
m22 = this.AddItem("剪切", M2);
m22.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
text.cut();
}
});
/* 复制选项 */
m23 = this.AddItem("复制", M2);
m23.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
text.copy();
}
});
/* 粘贴选项 */
m24 = this.AddItem("粘贴", M2);
m24.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
text.paste();
}
});
/* 删除选项 */
m25 = this.AddItem("删除", M2);
m25.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
text.replaceRange("", text.getSelectionStart(),
text.getSelectionEnd());
}
});
/* 自动换行选项 */
M3.add(m31);
m31.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
if (m31.getState())
text.setLineWrap(true);
else
text.setLineWrap(false);
}
});
/* 字体格式设置选项 */
m32 = this.AddItem("字体选择", M3);
m32.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
GraphicsEnvironment ge = GraphicsEnvironment
.getLocalGraphicsEnvironment();
//获取系统字体
JList<String> fontNames = new JList<String>(ge.getAvailableFontFamilyNames());
int response = JOptionPane.showConfirmDialog(null,
new JScrollPane(fontNames), "请选择字体",
JOptionPane.OK_CANCEL_OPTION);
Object selectedFont = fontNames.getSelectedValue();
if (response == JOptionPane.OK_OPTION && selectedFont != null)
text.setFont(new Font(fontNames.getSelectedValue()
.toString(), Font.PLAIN, 20));
}
});
/* 字体颜色设置选项 */
m33 = this.AddItem("字体颜色", M3);
m33.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
Color color = JColorChooser.showDialog(null, "文字颜色选择",
Color.WHITE);
text.setForeground(color);
}
});
m41 = this.AddItem("关于记事本", M4);
m41.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
JOptionPane.showMessageDialog(null, "记事本\n开发语言：JAVA\n开发者：袁健强",
"关于", JOptionPane.PLAIN_MESSAGE);
}
});
}
/** 文件格式过滤器 **/
private class filter extends javax.swing.filechooser.FileFilter {
public boolean accept(File file) {
String name = file.getName();
name.toLowerCase();
if (name.endsWith(".txt") || file.isDirectory())
return true;
else
return false;
}
public String getDescription() {
return ".txt";
}
}
/** 将菜单项JMenuItem添加到菜单JMenu **/
public JMenuItem AddItem(String name, JMenu menu) {
JMenuItem MI = new JMenuItem(name);
menu.add(MI);
return MI;
}
/** 将菜单JMenu添加到菜栏JMenuBar **/
public JMenu AddBar(String name, JMenuBar mb) {
JMenu Mb = new JMenu(name);
mb.add(Mb);
return Mb;
}
}