java编写记事本，java编写,import java.

java编写记事本，java编写,import java.

import java.awt.FileDialog;import java.awt.FlowLayout;import java.awt.event.*;import java.io.*;import java.util.*;import javax.swing.*;public class Not implements ActionListener, MouseListener {private ArrayList<String> al = new ArrayList<String>();private int set = 0;private JFrame jf = new JFrame("Notepad");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);}else{jta.setText("1234548882");}}if(comm.equals("否")){jta.setText("");jd.dispose(); } if(comm.equals("取消")){jd.dispose(); }if (comm.equals("保存") || comm.equals("另存...")||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...".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 byte[1024];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: xxx ");JLabel j2 = new JLabel("Email:xxxx@.com ");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...", "退出" };JMenuItem[] jmi1 = new JMenuItem[label1.length];for (int i = 0; i < jmi1.length; i++) {jmi1[i] = new JMenuItem(label1[i]);jm1.add(jmi1[i]);jmi1[i].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 JMenuItem[label2.length];for (int i = 0; i < jmi2.length; i++) {jmi2[i] = new JMenuItem(label2[i]);jm2.add(jmi2[i]);jmi2[i].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);}public static void main(String[] args) {new Notepad();}public void mouseClicked(MouseEvent e) {if (e.getButton() == 3) {pp.setVisible(true);pp.show(e.getComponent(), e.getX(), e.getY());}}public void mouseEntered(MouseEvent e) {}public void mouseExited(MouseEvent e) {}public void mousePressed(MouseEvent e) {}public void mouseReleased(MouseEvent e) {}}