Java编写的记事本程序.docx

import java.awt.FileDialog;import java.awt.FlowLayout;import java.awt.event.*;import java.io.*;import java.util.*;import javax.swing.*;public class notepad implements ActionListener, MouseListener private ArrayList al = new ArrayList();private int set = 0;private JFrame jf = new JFrame(记事本);private JTextArea jta = new JTextArea(20,40);JScrollPane jsp = new JScrollPane(jta);private JTextField jtf = new JTextField(10);private JTextField jtft = new JTextField(10);private JPopupMenu pp = new JPopupMenu();private String target = null;private JDialog jd = new JDialog(jf, 警告);public void actionPerformed(ActionEvent e) String comm = e.getActionCommand();if (comm.equals(新建) if(!jta.getText().equals()jd.setLocation(300, 300);jd.setVisible(true);elsejta.setText();if(comm.equals(否)jta.setText();jd.dispose();if(comm.equals(取消)jd.dispose();if (comm.equals(保存) | comm.equals(另存为)|comm.equals(是) if(comm.equals(是) jd.dispose();FileDialog fd = new FileDialog(jf, 打开, FileDialog.SAVE);fd.setFilenameFilter(new FilenameFilter() public boolean accept(File dir, String name) return name.endsWith(.txt) | name.endsWith(.java););if (target = null | 另存为.equals(comm) fd.setVisible(true);if (fd.getFile() != null) target = fd.getFile();try FileOutputStream fos = new FileOutputStream(fd.getDirectory()+ target);byte b = jta.getText().getBytes();for (byte by : b) fos.write(by);fos.close(); catch (IOException e1) e1.printStackTrace();if (comm.equals(打开) al.add(jta.getText();FileDialog fd = new FileDialog(jf, 打开, FileDialog.LOAD);fd.setFilenameFilter(new FilenameFilter() public boolean accept(File dir, String name) return name.endsWith(.txt) | name.endsWith(.java););fd.setVisible(true);/ 以下是打开文件target = fd.getFile();String str = fd.getDirectory() + target;if (fd.getFile() != null) try String res = ;FileInputStream fis = new FileInputStream(str);byte b = new byte1024;int count;while (count = fis.read(b) != -1) res = res + new String(b, 0, count);fis.close();jta.setText(res); catch (IOException e1) e1.printStackTrace();if (comm.equals(退出) System.exit(0);if (comm.equals(撤销) if(!al.isEmpty()jta.setText(al.get(al.size()-1);al.remove(al.size()-1);if (comm.equals(剪切) al.add(jta.getText();jta.cut();if (comm.equals(复制) al.add(jta.getText();jta.copy();if (comm.equals(粘贴) al.add(jta.getText();jta.paste();if (comm.equals(删除) al.add(jta.getText();jta.cut();if (查找.equals(comm) | 替换.equals(comm) JDialog jdct = new JDialog(jf,comm);String label = comm.substring(0, 2);JButton jb = new JButton(label);jb.addActionListener(this);jdct.setLayout(new FlowLayout();jdct.add(jtf);if (替换.equals(comm) JLabel jlt = new JLabel();jdct.add(jlt);jdct.add(jtft);jdct.add(jb);if (替换.equals(comm) JButton jball = new JButton(替换全部);jball.addActionListener(this);jdct.add(jball);jdct.pack();jdct.setResizable(false);jdct.setLocation(400, 240);jdct.setVisible(true);if (comm.equals(全选) jta.selectAll();if (comm.equals(关于.) JDialog jdgy = new JDialog(jf, 关于我.);jdgy.setLayout(new FlowLayout();JLabel jl = new JLabel(制作者: 张世航 );JLabel j2 = new JLabel(Email: zsh_);jdgy.add(jl);jdgy.add(j2);jdgy.setSize(180, 100);jdgy.setResizable(false);jdgy.setLocation(400, 240);jdgy.setVisible(true);/查找实现if (comm.equals(查找) String str = jtf.getText();String strall = jta.getText();int n = strall.indexOf(str, set);if (n != -1) set = n + 1;jta.setSelectionStart(n);jta.setSelectionEnd(n + str.length();/替换实现 if (comm.equals(替换) | comm.equals(替换全部) al.add(jta.getText();String str = jtf.getText();String strall = jta.getText();if (comm.equals(替换全部) int n1 = 0;while (true) set = strall.indexOf(str, n1);if (set = -1)break;n1 = set + 1;jta.setSelectionStart(set);jta.setSelectionEnd(set + str.length();jta.replaceSelection(jtft.getText();set = 0;int n = strall.indexOf(str, set);if (n = -1) set = 0; else set = n + 1;jta.setSelectionStart(n);jta.setSelectionEnd(n + str.length();jta.replaceSelection(jtft.getText();public notepad() /构造器jta.setLineWrap(true);jta.addMouseListener(this);JMenuBar jmb = new JMenuBar();JMenu jm1 = new JMenu(文件);String label1 = 新建, 打开, 保存, 另存为, 退出 ;JMenuItem jmi1 = new JMenuItemlabel1.length;for (int i = 0; i jmi1.length; i+) jmi1i = new JMenuItem(label1i);jm1.add(jmi1i);jmi1i.addActionListener(this);jm1.insertSeparator(1);jm1.insertSeparator(3);jm1.insertSeparator(6);JMenu jm2 = new JMenu(编辑);String label2 = 撤销, 剪切, 复制, 粘贴, 删除, 查找., 替换.,全选 ;JMenuItem jmi2 = new JMenuItemlabel2.length;for (int i = 0; i jmi2.length; i+) jmi2i = new JMenuItem(label2i);jm2.add(jmi2i);jmi2i.addActionListener(this);jm2.insertSeparator(1);jm2.insertSeparator(5);jm2.insertSeparator(7);jm2.insertSeparator(10);JMenu jm3 = new JMenu(帮助);JMenuItem jmi3 = new JMenuItem(关于.);jm3.add(jmi3);jmi3.addActionListener(this);jmb.add(jm1);jmb.add(jm2);jmb.add(jm3);jf.setJMenuBar(jmb);jf.addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) jf.removeAll();jf.dispose(););/鼠标右健弹出菜单JMenuItem jmi11, jmi22, jmi33, jmi44;pp.add(jmi11 = new JMenuItem(剪切);pp.add(jmi22 = new JMenuItem(复制);pp.add(jmi33 = new JMenuItem(粘贴);pp.addSeparator();pp.add(jmi44 = new JMenuItem(全选);jmi11.addActionListener(this);jmi22.addActionListener(this);jmi33.addActionListener(this);jmi44.addActionListener(this);jf.add(pp);/新建菜单jd.setLayout(new FlowLayout();JButton jb1 = new JButton(是);JButton jb2 = new JButton(否);JButton jb3 = new JButton(取消);jd.add(new JLabel(您当前编辑未保存,是否保存?);jb1.addActionListener(this);jb2.addActionListener(this);jb3.addActionListener(this);jd.add(jb1);jd.add(jb2);jd.add(jb3);jd.pack();jf.add(jsp);jf.pack();jf.setLocation(300, 200);jf.setVisible(true);jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);SuppressWarnings(unused)public static void main(String args)