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+"\r\n";
                     }
                     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