FileReader和FileWriter

public class Ftest extends JFrame{
    private static final long sertalVersionUID = 1L;
    private JPanel jContentPane = null;
    private JTextArea jTextArea = null;
    private JPanel controlPane = null;
    private JButton openButton = null;
    private JButton closeButton = null;
    
    private JTextArea geJTextArea(){
        if(jTextArea == null){
            jTextArea = new JTextArea();
        }
        return jTextArea;
    }
    private JPanel getControlPanel(){
        if(controlPane == null){
            controlPane = new JPanel();
            controlPane.setLayout(new FlowLayout());
            controlPane.add(getOpenButton(),null);
            controlPane.add(getCloseButton(),null);
        }
        return controlPane;
    }
    private JButton getOpenButton() {
        if(openButton == null){
            openButton = new JButton();
            openButton.setText("写入文件");
            openButton.addActionListener(new ActionListener() {
                
                @Override
                public void actionPerformed(ActionEvent e) {
                    // TODO Auto-generated method stub
                    File file = new File("word.txt");
                    try {
                        FileWriter out = new FileWriter(file);
                        String s = jTextArea.getText();
                        out.write(s);
                        out.close();
                    } catch (Exception e1) {
                        // TODO: handle exception
                        e1.printStackTrace();
                    }
                }
            });
        }
        return openButton;
    }
    
    private JButton getCloseButton(){
        if(closeButton == null){
            closeButton = new JButton();
            closeButton.setText("读取文件");
            closeButton.addActionListener(new ActionListener() {
                
                @Override
                public void actionPerformed(ActionEvent e) {
                    // TODO Auto-generated method stub
                    File file = new File("word.txt");
                    try {
                        FileReader in = new FileReader(file);
                        char byt[] = new char[1024];
                        int len = in.read(byt);
                        jTextArea.setText(new String(byt,0,len));
                        in.close();
                    } catch (Exception e1) {
                        // TODO: handle exception
                        e1.printStackTrace();
                    }
                }
            });
        }
        return closeButton;
    }
    
    private void initialize(){
        this.setSize(300,200);
        this.setContentPane(getJContentPane());
        this.setTitle("JFrame");
    }
    
    private JPanel getJContentPane(){
        if(jContentPane == null){
            jContentPane = new JPanel();
            jContentPane.setLayout(new BorderLayout());
            jContentPane.add(geJTextArea(),BorderLayout.CENTER);
            jContentPane.add(getControlPanel(), BorderLayout.SOUTH);
        }
        return jContentPane;
    }
    
    public Ftest(){
        super();
        initialize();
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Ftest thisClass = new Ftest();
        thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        thisClass.setVisible(true);
    }

}