javaseday28(Swing 插件 做个小界面)

public class SwingDemo_02 extends javax.swing.JFrame{//需要继承后才能用它的对话框    protected static final String LINE_SEPARATOR = System.getProperty("line.separator");    protected   TextArea textArea = new TextArea();    private JFrame frame;    private JTextField textField;    private final Action action = new SwingAction();    protected JDialog dialog;    private JFileChooser chooser = null;    private JMenuBar menuBar;    private JMenu mnNewMenu;    private JMenu menu;    private JDialog jd;    private JMenuItem menuItem_1;    /**     * Launch the application.     */    public static void main(String[] args) {        EventQueue.invokeLater(new Runnable() {            public void run() {                try {                    SwingDemo_02 window = new SwingDemo_02();                    window.frame.setVisible(true);                } catch (Exception e) {                    e.printStackTrace();                }            }        });    }    /**     * Create the application.     */    public SwingDemo_02() {        initialize();    }    /**     * Initialize the contents of the frame.     */    private void initialize() {        frame = new JFrame();        frame.setBounds(100, 100, 450, 300);        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        frame.getContentPane().setLayout(null);        textArea.setBounds(10, 77, 300, 186);        frame.getContentPane().add(textArea);        textField = new JTextField();        textField.addKeyListener(new KeyAdapter() {            @Override            public void keyPressed(KeyEvent e) {                if(e.getKeyCode()==KeyEvent.VK_ENTER);                showDir(textArea);            }        });        textField.setBounds(10, 32, 197, 23);        frame.getContentPane().add(textField);        textField.setColumns(10);        JButton btnNewButton = new JButton("ee");        btnNewButton.setAction(action);        btnNewButton.addActionListener(new ActionListener() {            public void actionPerformed(ActionEvent e) {                /*                 * 通过点击按钮获取文本框中目录                 * 将目录中的内容演示到文本区域                 */                showDir(textArea);            }        });        btnNewButton.setBounds(280, 32, 93, 23);        frame.getContentPane().add(btnNewButton);        menuBar = new JMenuBar();        menuBar.setBounds(40, 10, 333, 21);        frame.getContentPane().add(menuBar);        menu = new JMenu("\u6211\u64E6");        menuBar.add(menu);        mnNewMenu = new JMenu("\u83DC\u5355");        menuBar.add(mnNewMenu);        JMenuItem menuItem = new JMenuItem("\u6253\u5F00");        menuItem.addActionListener(new ActionListener() {            public void actionPerformed(ActionEvent e) {                try {                    jMenuItemlActionPerformed( e);                } catch (IOException e1) {                    // TODO Auto-generated catch block                    e1.printStackTrace();                }            }        });        menuItem.setAction(action);        mnNewMenu.add(menuItem);        menuItem_1 = new JMenuItem("\u4FDD\u5B58");        menuItem_1.addActionListener(new ActionListener() {            public void actionPerformed(ActionEvent e) {                try {                    jMenuItem2ActionPerformed(e);                } catch (IOException e1) {                    // TODO Auto-generated catch block                    e1.printStackTrace();                }            }        });        mnNewMenu.add(menuItem_1);    }    protected void showDir(TextArea textArea2) {        // TODO Auto-generated method stub        String dir_str = textField.getText();        File dir = new File(dir_str);        if(dir.exists()&&dir.isDirectory()) {            textArea.setText("");            String[] names = dir.list();            for(String name :names) {                textArea.append(name+LINE_SEPARATOR);            }        }    }    private void jMenuItemlActionPerformed(ActionEvent e) throws IOException {         chooser = new JFileChooser();//      FileNameExtensionFilter filter = new FileNameExtensionFilter(//          "JPG & GIF Images", "jpg", "gif");//      chooser.setFileFilter(filter);        int returnVal = chooser.showOpenDialog(this);        if(returnVal == JFileChooser.CANCEL_OPTION) {            System.out.println("没有选取文件");            return;        }         File file = chooser.getSelectedFile();        BufferedReader br = new BufferedReader(new FileReader(file));        String line = null;        while((line = br.readLine())!=null) {            textArea.append(line+LINE_SEPARATOR);        }        br.close();//      if(returnVal == JFileChooser.APPROVE_OPTION) { //         System.out.println("You chose to open this file: " +//              chooser.getSelectedFile().getName());//      }     }    private void jMenuItem2ActionPerformed(ActionEvent e) throws IOException {        chooser = new JFileChooser();        int returnVal = chooser.showSaveDialog(this);        if(returnVal == JFileChooser.CANCEL_OPTION) {            System.out.println("没有选取文件");            return;        }        File file = chooser.getSelectedFile();        String txte = textArea.getText();        BufferedWriter br = new BufferedWriter(new FileWriter(file));        br.write(txte);//记事本不能解析 可以用别的 就有换行了        br.close();    }    private class SwingAction extends AbstractAction {        private static final long serialVersionUID = 1L;        public SwingAction() {            putValue(NAME, "呵呵");            putValue(SHORT_DESCRIPTION, "Some short description");        }        public void actionPerformed(ActionEvent e) {        }    }}