예제 9월 2일 FileInputStream 객체를 이용한 텍스트 뷰어

package net.jeongsam.gui;

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

@SuppressWarnings("serial")
class MyViewer extends Frame implements ActionListener {
	private TextField txtFileName;
	private Button btnOpen;
	private TextArea txtTextArea;
	
	public MyViewer() {
		super("텍스트 뷰어");
		
		txtFileName = new TextField(20);
		btnOpen = new Button("열기");
		txtTextArea = new TextArea(20, 20);
		
		btnOpen.addActionListener(this);
		
		Panel p = new Panel();
		
		p.add(new Label("파일명:"));
		p.add(txtFileName);
		p.add(btnOpen);
		
		add(p, BorderLayout.NORTH);
		add(txtTextArea, BorderLayout.CENTER);
		
		setSize(400, 300);
		setVisible(true);
	}

	public static void main(String[] args) {
		new MyViewer();
	}
	
	public void actionPerformed(ActionEvent e) {
		try {
			int rByte = 0;
			FileInputStream fis = new FileInputStream(txtFileName.getText());
			
			while ((rByte = fis.read()) != -1) {
				txtTextArea.setText(txtTextArea.getText() + (char)rByte);
			}
			
			fis.close();
		} catch (FileNotFoundException e1) {
			e1.printStackTrace();
		} catch (IOException e1) {
			e1.printStackTrace();	
		}
	}
}