java程序文件读取与保存实例代码

class RadioHere extends JFrame implements ActionListener
{
    private JTextArea ta=new JTextArea(10,20);
    private JFileChooser jfc=new JFileChooser(new File("."));
    private JButton bOpen,bSave;
    public RadioHere()
    {
        super("文档选择框应用程序");
        JScrollPane ps=new JScrollPane(ta);
        bOpen=new JButton("选取");
        bSave=new JButton("存盘"); 
        setLayout(new FlowLayout(FlowLayout.CENTER,15,10));
        add(ps);
        add(bOpen);
        add(bSave);
        bOpen.addActionListener(this);
        bSave.addActionListener(this);
        setVisible(true);
        setSize(600,560);
    }
    public static void main(String[] args)
    {
        RadioHere frm=new RadioHere();
        frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    public void actionPerformed(ActionEvent e)
    {
        JButton jbt=(JButton)e.getSource();
        if(jbt==bOpen)
        {
            int status=jfc.showOpenDialog(this);
            if(status!=JFileChooser.APPROVE_OPTION)
                ta.setText("没有选择文件");
            else {
                try{
                    File file1=jfc.getSelectedFile();
                    Scanner scan=new Scanner(file1);
                    String info="";
                    while(scan.hasNext())
                    {
                        String str=scan.nextLine();
                        info+=str+"
";
                    }
                    ta.setText(info);
                }
                catch(FileNotFoundException ex){
            
                }
                }
            }
            else{
                int re=jfc.showSaveDialog(this);
                if(re==JFileChooser.APPROVE_OPTION)
                {
                    try{
                        File file2=jfc.getSelectedFile();
                        FileOutputStream f=new FileOutputStream(file2);
                        BufferedOutputStream out=new BufferedOutputStream(f);
                        byte[] b=(ta.getText()).getBytes();
                        out.write(b,0,b.length);
                        out.close();
                    }
                    catch(IOException ie)
                    {
                    }
                }
            }
    }
}

可以读取txt和cpp文档，并且能够将textarea里面的内容进行保存