java编写记事本

版权声明：[email protected] https://blog.csdn.net/weixin_43198122/article/details/84865074

用java写了一个记事本，以作练习，一些功能没有实现
运行截图：

代码如下：

package com.hbsd.study;

import java.awt.BorderLayout;
import java.awt.Desktop;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedWriter;
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.OutputStreamWriter;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.swing.ImageIcon;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
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;

public class Note extends JFrame implements ActionListener {
	JMenuBar menubar;
	JMenu file,edit,format,watch,help;
	JMenuItem create,open,save,saveto,set,print,exit;
	JMenuItem cx,cut,copy,paste,delete,cz,th,zd,qx,rq;
	JMenuItem font,ztl,ckbz,gy;
	JCheckBoxMenuItem zdhh;
	JTextArea panel;
	JScrollPane jsp;
	private static String name;
	JFileChooser filechooser;
	public Note(){
		super("新建文本文档.txt"+"- 记事本");
		menubar=new JMenuBar();
		filechooser=new JFileChooser();
		file=new JMenu("文件(F)");
		edit=new JMenu("编辑(E)");
		format=new JMenu("格式(O)");
		watch=new JMenu("查看(V)");
		help=new JMenu("帮助(H)");
		create=new JMenuItem("新建");
		open=new JMenuItem("打开");
		save=new JMenuItem("保存");
		saveto=new JMenuItem("另存为");
		set=new JMenuItem("页面设置");
		print=new JMenuItem("打印");
		exit=new JMenuItem("退出");
		cx=new JMenuItem("撤销");cut=new JMenuItem("剪切");copy=new JMenuItem("拷贝");paste=new JMenuItem("粘贴");
		delete=new JMenuItem("删除");cz=new JMenuItem("查找");th=new JMenuItem("替换");zd=new JMenuItem("转到");
		qx=new JMenuItem("全选");rq=new JMenuItem("日期/时间");
		zdhh=new JCheckBoxMenuItem("自动换行");font=new JMenuItem("字体");ztl=new JMenuItem("状态栏");ckbz=new JMenuItem("查看帮助");gy=new JMenuItem("关于记事本");
		menubar.add(file);menubar.add(edit);menubar.add(format);menubar.add(watch);menubar.add(help);
		try {
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
		} catch (ClassNotFoundException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		} catch (InstantiationException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		} catch (IllegalAccessException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		} catch (UnsupportedLookAndFeelException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		file.add(create);file.add(open);file.add(save);file.add(saveto);file.addSeparator();file.add(set);file.add(print);file.addSeparator();file.add(exit);
		edit.add(cx);edit.addSeparator();edit.add(cut);edit.add(copy);edit.add(paste);edit.add(delete);
		edit.addSeparator();edit.add(cz);edit.add(th);edit.add(zd);edit.addSeparator();edit.add(qx);edit.add(rq);
		cx.setEnabled(false);cut.setEnabled(false);copy.setEnabled(false);paste.setEnabled(false);delete.setEnabled(false);cz.setEnabled(false);th.setEnabled(false);
		zd.setEnabled(false);qx.setEnabled(false);
		format.add(zdhh);format.add(font);
		watch.add(ztl);help.add(ckbz);help.addSeparator();help.add(gy);
		create.addActionListener(this);open.addActionListener(this);save.addActionListener(this);
		saveto.addActionListener(this);set.addActionListener(this);exit.addActionListener(this);gy.addActionListener(this);help.addActionListener(this);
		zdhh.addActionListener(this);font.addActionListener(this);rq.addActionListener(this);
		print.setEnabled(false);
		this.setJMenuBar(menubar);
		panel=new JTextArea();
		//panel.setLayout(new FlowLayout());
		jsp=new JScrollPane(panel);
		jsp.setPreferredSize(new Dimension(780,550));
		this.add(jsp,BorderLayout.CENTER);
		//this.add(panel);
		this.setBounds(600, 300, 600, 400);
		this.setVisible(true);
		this.setIconImage(new ImageIcon("src\\1.ico").getImage());
		this.addWindowListener(new WindowAdapter() {
			@Override
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
		
	}
	public static void main(String[] args) {
		Note note=new Note();
	}
	@Override
	public void actionPerformed(ActionEvent e) {
		if(e.getSource()==create){
			createFile();
		}
		if(e.getSource()==exit){
			System.exit(0);
		}
		if(e.getSource()==open){
			filechooser.showOpenDialog(this);
			panel.setText(openFile());
		}
		if(e.getSource()==save||e.getSource()==saveto){
			filechooser.showSaveDialog(this);
			File file=filechooser.getSelectedFile();
			saveFile(file);
		}
		if(e.getSource()==set){
			String s=JOptionPane.showInputDialog(this,"请输入宽、高：","默认：600 400");
			String[] str=new String[2];
			str=s.split(" ");
			int wigth=Integer.parseInt(str[0]);
			int height=Integer.parseInt(str[1]);
			this.setSize(wigth, height);
		}
		if(e.getSource()==copy){
			panel.copy();
		}
		if(e.getSource()==cut){
			panel.cut();
		}
		if(e.getSource()==paste){
			panel.paste();
		}
		if(e.getSource()==rq){
			SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
			JOptionPane.showMessageDialog(this, df.format(new Date()));
		}
		if(e.getSource()==font){
			String s=JOptionPane.showInputDialog(this,"请输入字体名称：","宋体");
			panel.setFont(new Font(s,Font.TYPE1_FONT,20));
		}
		if(e.getSource()==gy){
			JOptionPane.showMessageDialog(this, "路漫漫其修远兮，吾将上下而求索！");
		}
		if(e.getSource()==help){
			String web="www.baidu.com";
			Desktop desktop=Desktop.getDesktop();
			try {
				desktop.browse(new URI(web));
			} catch (IOException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			} catch (URISyntaxException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}	
		}
		if(e.getSource()==zdhh){
			if(zdhh.isSelected()){
				panel.setLineWrap(true);
			}else{
			panel.setLineWrap(false );
			}
		}
	}
	@SuppressWarnings("finally")
	private String openFile() {
		FileInputStream is=null;
		StringBuilder sb=null;
		//FileOutputStream fo=null;
		try {
			is=new FileInputStream(filechooser.getSelectedFile());
			sb=new StringBuilder();
			byte[] data=new byte[1024];
			int len=-1;
			try {
				while((len=is.read(data))!=-1){
					String str=new String(data,0,len);
					sb.append(str);
				}
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		try {
			is.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		finally{
			name = filechooser.getSelectedFile().getName();
			this.setTitle(name + " - 记事本");
			return sb.toString();
		}
		
	}
	private void createFile() {
		// String name = null;
		File file = null;
		// 选择保存或取消
		if (filechooser.showSaveDialog(Note.this) == JFileChooser.APPROVE_OPTION) {
			file = filechooser.getSelectedFile();// 获取选中的文件
		} else {
			return;
		}
		name = filechooser.getName(file);// 获取输入的文件名
		if (file.exists()) { // 若选择已有文件----询问是否要覆盖
			int i = JOptionPane.showConfirmDialog(null, "该文件已存在,是否覆盖原文件", "确认", JOptionPane.YES_NO_OPTION);
			if (i == JOptionPane.YES_OPTION) {
				saveFile(file);
			} else {
				filechooser.showSaveDialog(Note.this);// 重新选择
			}
		} else {//文件不存在，则直接保存
			saveFile(file);
		}
	}
	private void saveFile(File file) {
		BufferedWriter bw = null;
		try {
			bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file)));
			bw.write(panel.getText());//写入文件
			bw.flush();
		} catch (FileNotFoundException e1) {
			JOptionPane.showMessageDialog(Note.this, "文件保存出错" + e1.getMessage());
		} catch (IOException e1) {
			e1.printStackTrace();
		} finally {
			try {
				if (bw != null)
					bw.close();
			} catch (IOException e1) {
			}
		}
	}


}