java仿windows记事本小程序

本文实例为大家分享了java仿windows记事本小程序的具体代码，供大家参考，具体内容如下

import java.awt.CheckboxMenuItem;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.MenuShortcut;
import java.awt.TextArea;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.peer.ButtonPeer;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.StringReader;
import java.io.StringWriter;
import java.sql.Date;
import java.text.SimpleDateFormat;

import javax.print.DocFlavor.STRING;
import javax.script.ScriptException;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.ButtonGroup;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.border.EtchedBorder;
import javax.swing.border.TitledBorder;
import javax.swing.event.AncestorListener;
import javax.swing.filechooser.FileNameExtensionFilter;

public class Crazy_15_4 {
private JFrame f = new JFrame("记事本");

//成员变量
static String shearPlate = null;
static boolean isAutoWrap = true;//是否自动换行
JTextArea ta = new JTextArea(20, 60);
JScrollPane jsp = new JScrollPane(ta);
private MenuBar mb = new MenuBar();
public String fontStr = "宋体";
public String shapeStr = "0";
public String sizeStr = "20";
Font font = new Font(fontStr, Integer.parseInt(shapeStr),Integer.parseInt(sizeStr) );

//menu
Menu file = new Menu("文件");
Menu edit = new Menu("编辑");
Menu format = new Menu("格式");

//menuitem
MenuItem newItem = new MenuItem("新建");
MenuItem openItem = new MenuItem("打开");
MenuItem saveItem = new MenuItem("保存");
MenuItem saveAsItem = new MenuItem("另存为");
MenuItem cutItem = new MenuItem("剪切");
MenuItem copyItem = new MenuItem("复制");
MenuItem pasteItem = new MenuItem("粘贴");
CheckboxMenuItem autoWrap = new CheckboxMenuItem("自动换行",isAutoWrap);
MenuItem FontItem = new MenuItem("字体");
//使用“ctrl+x”快捷键
MenuItem exitIitem = new MenuItem("退出", new MenuShortcut(KeyEvent.VK_X));

public void init() {
//带滚动条的文本域
ta.setLineWrap(isAutoWrap);
jsp.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
jsp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);

file.add(newItem);
file.add(openItem);
file.add(saveItem);
file.add(saveAsItem);

edit.add(cutItem);
edit.add(copyItem);
edit.add(pasteItem);

format.add(autoWrap);
format.add(FontItem);

mb.add(file);
mb.add(edit);
mb.add(format);

f.setMenuBar(mb);
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
if(!(ta.getText().equals(""))) {
 Object[] options = {"保存","不保存","取消"};
 int a = JOptionPane.showOptionDialog(null,"是否将更改保存到H:/Programing/无标题.txt","记事本", JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.QUESTION_MESSAGE, null, options, options[0]);
 if(a == JOptionPane.OK_OPTION ) {
 if(save()) {
 System.exit(0);
 }
 }else if(a == JOptionPane.NO_OPTION) {
 System.exit(0);
 }
}else {
 System.exit(0);
}
}
});

newItem.addActionListener(new newListener());
openItem.addActionListener(new openListener());
saveItem.addActionListener(new saveListener());
saveAsItem.addActionListener(new saveAsListener());
cutItem.addActionListener(new cutAsListener());
copyItem.addActionListener(new copyAsListener());
pasteItem.addActionListener(new pasteAsListener());
autoWrap.addItemListener(new autoWrapAsListener());
FontItem.addActionListener(new fontListener());

ta.setFont(font);
//使文本框处在屏幕中间
int width = Toolkit.getDefaultToolkit().getScreenSize().width;
int height = Toolkit.getDefaultToolkit().getScreenSize().height;
f.add(jsp);
f.pack();
f.setLocation(width/2-f.getWidth()/2, height/2-f.getHeight()/2);
f.setVisible(true);
//避免关闭对话框直接关闭文本文件
f.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
}
public static void main(String[] args) {
new Crazy_15_4().init();
}

//是否保存
public void saveOrNot() {
if(!(ta.getText().equals(""))) {
Object[] options = {"保存","不保存","取消"};
int a = JOptionPane.showOptionDialog(null,"是否将更改保存到H:/Programing/无标题.txt","记事本", JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.QUESTION_MESSAGE, null, options, options[0]);
if(a == JOptionPane.OK_OPTION ) {
save();
}
}
}
//保存文本文件
public boolean save() {
boolean isSaved = false;
JFileChooser jf = new JFileChooser();
FileNameExtensionFilter filter = new FileNameExtensionFilter("txt","txt");
jf.setAcceptAllFileFilterUsed(false);
jf.setFileFilter(filter);
int value = jf.showSaveDialog(null);
if(value == JFileChooser.APPROVE_OPTION) {
File file = jf.getSelectedFile();
String str = ta.getText();
byte[] buf = str.getBytes();
try {
OutputStream os = new FileOutputStream(file);
os.write(buf);
os.flush();
os.close();
isSaved = true;
} catch (IOException e) {
e.printStackTrace();
}
}
return isSaved;
}
//新建 *
class newListener implements ActionListener{
public void actionPerformed(ActionEvent e) {
if(!(ta.getText().equals(""))) {
Object[] options = {"保存","不保存","取消"};
int a = JOptionPane.showOptionDialog(null,"是否将更改保存到H:/Programing/无标题.txt","记事本", JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.QUESTION_MESSAGE, null, options, options[0]);
if(a == JOptionPane.OK_OPTION ) {
 if(save()) {
 ta.setText("");
 }
}else if(a == JOptionPane.NO_OPTION) {
 ta.setText("");
}
}

}
}

//打开 * ，从硬盘目录打开文本文件
class openListener implements ActionListener{
public void actionPerformed(ActionEvent e) {
JFileChooser jf = new JFileChooser();
FileNameExtensionFilter filter = new FileNameExtensionFilter("txt","txt");
jf.setAcceptAllFileFilterUsed(false);
jf.setFileFilter(filter);
int value = jf.showOpenDialog(null);
if(value == JFileChooser.APPROVE_OPTION) {
File file = jf.getSelectedFile();
try {
 String encoding = "GBK";//考虑编码格式
 InputStreamReader isr = new InputStreamReader(new FileInputStream(file),encoding);
 BufferedReader br = new BufferedReader(isr);
 String str = null;
 while((str = br.readLine()) != null) {
 ta.append(str);
 }
} catch (FileNotFoundException e1) {
 // TODO Auto-generated catch block
 e1.printStackTrace();
} catch (IOException e1) {
 // TODO Auto-generated catch block
 e1.printStackTrace();
}
}
}
}

//保存 * ，以电脑时间命名
class saveListener implements ActionListener{
public void actionPerformed(ActionEvent e) {
String name = null;
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH-mm-ss");
name = df.format(System.currentTimeMillis());
File file = new File("H:/Programing/workspace/"+name+".txt");
String str = ta.getText();
byte[] buf = str.getBytes();
if(!str.equals("")) {
try {
 OutputStream os = new FileOutputStream(file);
 os.write(buf);
 os.flush();
 os.close();
} catch (IOException e2) {
 e2.printStackTrace();
}
}
}
}

//另存为 *
class saveAsListener implements ActionListener{
public void actionPerformed(ActionEvent e) {
save();
}
}

//剪切 *
class cutAsListener implements ActionListener{
public void actionPerformed(ActionEvent e) {
shearPlate = ta.getSelectedText();
int startPosi = ta.getSelectionStart();
int endPosi = ta.getSelectionEnd();
StringBuffer sb = new StringBuffer(ta.getText());
sb.delete(startPosi, endPosi);
ta.setText(sb.toString());
}
}

//复制 *
class copyAsListener implements ActionListener{
public void actionPerformed(ActionEvent e) {
shearPlate = ta.getSelectedText();
}
}

//粘贴 *
class pasteAsListener implements ActionListener{
public void actionPerformed(ActionEvent e) {
int position = ta.getCaretPosition();
StringBuilder sb = new StringBuilder(ta.getText());
sb.insert(position, shearPlate);
ta.setText(sb.toString());
ta.setCaretPosition(position+shearPlate.length());
}
}

//自动换行 *
class autoWrapAsListener implements ItemListener{

@Override
public void itemStateChanged(ItemEvent e) {
if(autoWrap.getState()) {
 isAutoWrap = true;
 ta.setLineWrap(isAutoWrap);
 jsp.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
 jsp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
}else {
 isAutoWrap = false;
 ta.setLineWrap(isAutoWrap);
 jsp.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
 jsp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_NEVER);
}
}
}

//字体 *
class fontListener implements ActionListener{
JFrame jf = new JFrame("字体");
JPanel jp = new JPanel();
ButtonPanel fontButton = new ButtonPanel("字体",new String[] {"宋体","黑体","楷体","吴祎晗1.0"});
ButtonPanel shapeButton = new ButtonPanel("字形",new String[] {"常规","粗体","斜体","粗体&斜体"});
ButtonPanel sizeButton = new ButtonPanel("字号",new String[] {"12","16","20","24","26"});
public void actionPerformed(ActionEvent e) {
jp.setBorder(new TitledBorder(new EtchedBorder(),"字体选择",TitledBorder.CENTER,TitledBorder.TOP));
jp.add(fontButton);
jp.add(shapeButton);
jp.add(sizeButton);
jf.add(jp);
jf.pack();
jf.setLocationRelativeTo(f);
jf.setVisible(true);
jf.addWindowListener(new WindowAdapter() {
 public void windowClosing(WindowEvent e) {
 fontStr = fontButton.getSelec();
 sizeStr = sizeButton.getSelec();
 font = new Font(fontStr, shapeVal(shapeButton.getSelec()), Integer.parseInt(sizeStr));
 ta.setFont(font);
 }
});
}

public int shapeVal(String str) {
int a = 0;
switch (str) {
case "常规":
 a = 0;
 break;
case "粗体":
 a = 1;
 break;
case "斜体":
 a = 2;
 break;
case "粗体&斜体":
 a = 3;
 break;
}
return a;
}
}

}

//定义一个JPanel类扩展类，该类的对象包含多个纵向排列的
//JRadioButton控件，且panel扩展类可以指定一个字符串作为TitledBorder
class ButtonPanel extends JPanel{
private ButtonGroup group;
public ButtonPanel(String title, String[] options) {
setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(),title));
setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
group = new ButtonGroup();
for(int i=0; options!=null&&i<options.length; i++) {
JRadioButton b = new JRadioButton(options[i]);
b.setActionCommand(options[i]);
this.add(b);
group.add(b);
if(title.equals("字号")) {
b.setSelected(i == 2);
}else {
b.setSelected(i == 0);
}
}
}
public String getSelec() {
return group.getSelection().getActionCommand();
}
}

来源：https://blog.csdn.net/wuyihan1994/article/details/80048629