/*例9.3(P179) 说明BufferedWriter类用法的应用程序*/

import java.io.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

class MyWindow extends JFrame implements ActionListener
{
    JTextArea text; JButton button;
    FileWriter writefile; BufferedWriter out;
    MyWindow()
    {
        super("缓冲式样流的输出");
        Container con=this.getContentPane();//获得内容面板
        text=new JTextArea(20,30); text.setBackground(Color.cyan);
        button=new JButton("写文件"); button.addActionListener(this);
        con.setLayout(new BorderLayout());
        con.setSize(40,40);
        con.setVisible(true);
        con.add(text,"Center");
        con.add(button, "South");
        try
        {
            writefile=new FileWriter("d:\\file2.txt");
            out=new BufferedWriter(writefile);            
        }
        catch(IOException e) {}        
    }
    public void actionPerformed(ActionEvent e)
    {
        if(e.getSource()==button) //将文本区内容采用缓冲式输出到文件
            {try {
                out.write(text.getText(),0,(text.getText()).length());
                out.flush();
                text.setText(null);
                System.exit(0);
                }
            catch (IOException exp)
                {
                    text.setText("文件写出错!\n");
                    System.exit(-1);
                }
            }
    }
}

public class Test
{
    public static void main(String args[])
    {
        MyWindow myWin=new MyWindow();
        myWin.pack();
    }
}

import java.io.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

class MyWindow extends JFrame implements ActionListener
{
    static final long serialVersionUID=1L;
    JTextArea text; JButton button;
    FileWriter writefile; BufferedWriter out;
    MyWindow()
    {
        super("缓冲式样流的输出");
        Container con=this.getContentPane();//获得内容面板
        text=new JTextArea(20,30);
        text.setBackground(Color.cyan);
        button=new JButton("写文件");
        button.addActionListener(this);
        con.setLayout(new BorderLayout());
        con.setSize(40,40);
        con.setVisible(true);
        con.add(text,"Center");
        con.add(button, "South");
        try
        {
            writefile=new FileWriter("d:\\file2.txt");
            out=new BufferedWriter(writefile);
        }
        catch(IOException e) {
            e.printStackTrace();
        }
    }
    public void actionPerformed(ActionEvent e)
    {
        if(e.getSource()==button) //将文本区内容采用缓冲式输出到文件
            {try {
                out.write(text.getText(),0,(text.getText()).length());
                out.flush();
                text.setText(null);
                System.exit(0);
                }
            catch (IOException exp)
                {
                    text.setText("文件写出错!\n");
                    System.exit(-1);
                }
            }
    }
}

public class Test2
{
    public static void main(String args[])
    {
        MyWindow myWin=new MyWindow();

        myWin.pack();
        myWin.setVisible(true);
        myWin.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}