main.java

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        jMenuBar1.add(helpMenu);

        setJMenuBar(jMenuBar1);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 536, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jScrollPane1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 353, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents
    private void openMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_openMenuItemActionPerformed
        // TODO add your handling code here:
        openText();
    }//GEN-LAST:event_openMenuItemActionPerformed

    private void exitMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_exitMenuItemActionPerformed
        // TODO add your handling code here:
        exitapp();
    }//GEN-LAST:event_exitMenuItemActionPerformed

    private void stateMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_stateMenuItemActionPerformed
    // TODO add your handling code here:
    }//GEN-LAST:event_stateMenuItemActionPerformed

    private void saveMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_saveMenuItemActionPerformed
        // TODO add your handling code here:
        saveText();
    }//GEN-LAST:event_saveMenuItemActionPerformed

    private void newMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_newMenuItemActionPerformed
        // TODO add your handling code here:
        newText();
    }//GEN-LAST:event_newMenuItemActionPerformed

    private void repealMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_repealMenuItemActionPerformed
        // TODO add your handling code here:
        repeal();
    }//GEN-LAST:event_repealMenuItemActionPerformed

    private void cutMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_cutMenuItemActionPerformed
        // TODO add your handling code here:
        cutText();
    }//GEN-LAST:event_cutMenuItemActionPerformed

    private void copyMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_copyMenuItemActionPerformed
        // TODO add your handling code here:
        copyText();
    }//GEN-LAST:event_copyMenuItemActionPerformed

    private void pasteMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_pasteMenuItemActionPerformed
        // TODO add your handling code here:
        pasteText();
    }//GEN-LAST:event_pasteMenuItemActionPerformed

    private void selectallMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_selectallMenuItemActionPerformed
        // TODO add your handling code here:
        selectall();
    }//GEN-LAST:event_selectallMenuItemActionPerformed

    private void searchMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_searchMenuItemActionPerformed
        // TODO add your handling code here:
        search();
    }//GEN-LAST:event_searchMenuItemActionPerformed

    private void dateMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_dateMenuItemActionPerformed
        // TODO add your handling code here:
        date();
    }//GEN-LAST:event_dateMenuItemActionPerformed

    private void autodownCheckBoxMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_autodownCheckBoxMenuItemActionPerformed
        // TODO add your handling code here:
        autodown();
    }//GEN-LAST:event_autodownCheckBoxMenuItemActionPerformed

    private void aboutMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_aboutMenuItemActionPerformed
        // TODO add your handling code here:
        JOptionPane.showConfirmDialog(this, "JNotepad 是由 Yee 开发的仿Windows记事本程序。\nQQ：924347108 （易）", "关于 JNotepad",
                JOptionPane.DEFAULT_OPTION,
                JOptionPane.INFORMATION_MESSAGE);
    }//GEN-LAST:event_aboutMenuItemActionPerformed

    private void helpMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_helpMenuItemActionPerformed
        // TODO add your handling code here:
        JOptionPane.showConfirmDialog(this, "JNotepad 是由 Yee 开发的仿Windows记事本程序。\n所以其功能及各项操作与Windows记事本程序基本一致。", "帮助",
                JOptionPane.DEFAULT_OPTION,
                JOptionPane.INFORMATION_MESSAGE);
    }//GEN-LAST:event_helpMenuItemActionPerformed

    private void fontMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_fontMenuItemActionPerformed
        // TODO add your handling code here:
        setFont();
    }//GEN-LAST:event_fontMenuItemActionPerformed

    private void exchangeMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_exchangeMenuItemActionPerformed
        // TODO add your handling code here:
        exchange();
    }//GEN-LAST:event_exchangeMenuItemActionPerformed

    private void delMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_delMenuItemActionPerformed
        // TODO add your handling code here:
        del();
    }//GEN-LAST:event_delMenuItemActionPerformed

    private void searchnextMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_searchnextMenuItemActionPerformed
        // TODO add your handling code here:
        searchnext();
    }//GEN-LAST:event_searchnextMenuItemActionPerformed

    class UndoHander implements UndoableEditListener {

        public void undoableEditHappened(UndoableEditEvent eundo) {
            undo.addEdit(eundo.getEdit());
        }
    }

    private void newText() {
        int selection = JOptionPane.showConfirmDialog(this,
                "是否保存当前文本文档？", "保存提示", JOptionPane.OK_CANCEL_OPTION,
                JOptionPane.WARNING_MESSAGE);
        if (selection == JOptionPane.OK_OPTION) {
            saveText();
        }
        mainTextArea.setText("");
        setTitle("新建文本文档.txt");
    }

    private void openText() {
        int selection = JOptionPane.showConfirmDialog(this,
                "是否保存当前文本文档？", "保存提示", JOptionPane.OK_CANCEL_OPTION,
                JOptionPane.WARNING_MESSAGE);
        if (selection == JOptionPane.OK_OPTION) {
            saveText();
        }
        try {
            Frame f = new Frame();
            FileDialog fd = new FileDialog(f, "打开文件", FileDialog.LOAD);
            fd.setVisible(true);
            String fpath = fd.getDirectory();
            final String fname = fd.getFile();
            BufferedReader br = new BufferedReader(new FileReader(fpath + fname));
            mainTextArea.setText("");
            setTitle(fname);
            String s = br.readLine();
            while (s != null) {
                mainTextArea.append(s + "\n");
                s = br.readLine();
            }
            br.close();
        } catch (Exception ex) {
        }
    }

    private void saveText() {
        String fns = null;
        Frame f = new Frame("保存");
        FileDialog fd = new FileDialog(f, "保存文件", FileDialog.SAVE);
        String savepath = fd.getDirectory();
        String savename = fd.getFile();
        fd.setFile("*.txt");
        fd.setVisible(true);
        try {
            if (savename != null) {
                PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter(savepath + savename)));
                pw.write(mainTextArea.getText(), 0, mainTextArea.getText().length());
                pw.flush();
            }
        } catch (Exception esave) {
        }
    }

    private void repeal() {
        try {
            undo.undo();
//System.out.println(undo.canUndo()); 
        } catch (Exception eundo) {
        }
    }

    private void cutText() {
        mainTextArea.cut();
    }

    private void copyText() {
        mainTextArea.copy();
    }

    private void pasteText() {
        mainTextArea.paste();
    }

    private void del() {
        if (mainTextArea.getSelectedText() != null) {
            mainTextArea.replaceSelection("");
        } else {
            int length = mainTextArea.getSelectionEnd();
            mainTextArea.select(length - 1, length);
            mainTextArea.replaceSelection("");
        }

    }

    private void selectall() {
        mainTextArea.selectAll();
    }

    public void search() {
        try {
            final JDialog jd = new JDialog(this, "查找", true);
            GridBagLayout gbl = new GridBagLayout();
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.weightx = 0.5;
            gbc.weighty = 0.5;
            gbc.gridwidth = 1;
            gbc.gridheight = 1;
            jd.getContentPane().setLayout(gbl);
            jd.setSize(320, 100);
            jd.setResizable(false);
//jd.setDefaultLookAndFeelDecorated(true); 
            JLabel jlFind = new JLabel("查找内容:");
            gbc.gridx = 0;
            gbc.gridy = 0;
            jd.getContentPane().add(jlFind);
            JButton jbFind = new JButton("查找");

            jbFind.addActionListener(new ActionListener() {

                public void actionPerformed(ActionEvent efind) {
                    String strA = mainTextArea.getText();
                    String strB = jtf.getText();
                    if (a >= 0) {
                        a = strA.indexOf(strB, StartFindPos);

                        b = strB.length();
                        StartFindPos = a + b;
                        if (a == -1) {
                            JOptionPane.showMessageDialog(null, "没有您要查找的信息", "查找结果", 1);
                            a = 0;
                            StartFindPos = 0;
                        }
                        mainTextArea.select(a, StartFindPos);
                    }
                }
                });
            JButton jbCancel = new JButton("取消");
            jbCancel.addActionListener(new ActionListener() {

                public void actionPerformed(ActionEvent ejb) {
                    jd.dispose();
                }
                });
            gbc.gridx = 1;
            gbc.gridy = 0;
            jd.getContentPane().add(jtf, gbc);
            gbc.gridx = 0;
            gbc.gridy = 1;
            jd.getContentPane().add(jbFind, gbc);
            gbc.gridx = 1;
            gbc.gridy = 1;
            jd.getContentPane().add(jbCancel, gbc);
//jd.setResizable(false); 
            jd.setLocation(240, 200);
            jd.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
            jd.setVisible(true);
        } catch (Exception efind) {
        }
    }

    public void searchnext() {
        String strA = mainTextArea.getText();
        String strB = jtf.getText();
        if (a >= 0) {
            a = strA.indexOf(strB, StartFindPos);

            b = strB.length();
            StartFindPos = a + b;
            if (a == -1) {
                JOptionPane.showMessageDialog(null, "没有您要查找的信息", "查找结果", 1);
                a = 0;
                StartFindPos = 0;
            }
            mainTextArea.select(a, StartFindPos);
        }
    }

    private void exchange() {
        final JDialog jd = new JDialog(this, "替换", true);
        GridBagLayout gbl = new GridBagLayout();
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.weightx = 1;
        gbc.weighty = 1;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
        JLabel jlFind = new JLabel("查找:");
        JLabel jp = new JLabel("替换内容:");
        final JTextField jtf = new JTextField(15);
        final JTextField jtf1 = new JTextField(15);
        jd.getContentPane().setLayout(gbl);
        jd.setSize(330, 150);
        jd.setResizable(false);
        final JButton jbReplaceAll = new JButton("替换");
        final JButton jbCancel = new JButton("取消");
        final JButton jbFind = new JButton("查找");
        gbc.gridx = 0;
        gbc.gridy = 0;
        jd.getContentPane().add(jlFind, gbc);
        gbc.gridx = 1;
        gbc.gridy = 0;
        jd.getContentPane().add(jtf1, gbc);
        gbc.gridx = 2;
        gbc.gridy = 0;
        jd.getContentPane().add(jbFind, gbc);
        gbc.gridx = 0;
        gbc.gridy = 1;