Java 99. Cách mở file hoặc lưu file trong Java Swing

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Video giải thích chi tiết

 Code chi tiết 

package model;

public class MyNotepadModel {
	private String fileName;
	private String content;
	
	public MyNotepadModel() {
		this.fileName = "";
		this.content = "";
	}
	public String getFileName() {
		return fileName;
	}
	public void setFileName(String fileName) {
		this.fileName = fileName;
	}
	public String getContent() {
		return content;
	}
	public void setContent(String content) {
		this.content = content;
	}
	
	
}

package view;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

import controller.MyNotepadController;
import model.MyNotepadModel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import java.awt.Font;
import javax.swing.JButton;
import javax.swing.JLabel;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class MyNotepadView extends JFrame {

	private JPanel contentPane;
	public MyNotepadModel model;
	public JLabel lblNewLabel;
	public JTextArea textArea; 

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					MyNotepadView frame = new MyNotepadView();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public MyNotepadView() {
		this.model = new MyNotepadModel();
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 689, 475);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(new BorderLayout(0, 0));
		
		textArea = new JTextArea();
		textArea.setFont(new Font("Monospaced", Font.PLAIN, 18));

		JScrollPane scrollPane = new JScrollPane(textArea);
		contentPane.add(scrollPane, BorderLayout.CENTER);
		
		JPanel panel = new JPanel();
		panel.setPreferredSize(new Dimension(10, 50));
		contentPane.add(panel, BorderLayout.SOUTH);
		panel.setLayout(null);
		
		lblNewLabel = new JLabel("New label");
		lblNewLabel.setFont(new Font("Tahoma", Font.PLAIN, 18));
		lblNewLabel.setBounds(10, 0, 314, 39);
		panel.add(lblNewLabel);
		
		ActionListener action = new MyNotepadController(this);
		
		JButton btnOpen = new JButton("Open");
		btnOpen.addActionListener(action);
		btnOpen.setFont(new Font("Tahoma", Font.PLAIN, 18));
		btnOpen.setBounds(398, 11, 89, 28);
		panel.add(btnOpen);
		
		JButton btnSave = new JButton("Save");
		btnSave.addActionListener(action);
		btnSave.setFont(new Font("Tahoma", Font.PLAIN, 18));
		btnSave.setBounds(497, 11, 89, 28);
		panel.add(btnSave);
		this.setVisible(true);
	}
}

package controller;

import java.awt.event.ActionEvent;
import java.beans.PropertyChangeListener;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.util.List;

import javax.swing.Action;
import javax.swing.JFileChooser;

import view.MyNotepadView;

import java.awt.event.ActionListener;

public class MyNotepadController implements ActionListener {
	MyNotepadView myNotepadView;

	public MyNotepadController(MyNotepadView myNotepadView) {
		this.myNotepadView = myNotepadView;
	}

	@Override
	public void actionPerformed(ActionEvent e) {
		String command = e.getActionCommand();
		JFileChooser fc = new JFileChooser();
		
		if (command.equals("Open")) {
			int returnVal = fc.showOpenDialog(this.myNotepadView);
			if (returnVal == JFileChooser.APPROVE_OPTION) {
				File file = fc.getSelectedFile();
				String fileName = file.getName();
				this.myNotepadView.model.setFileName(file.getAbsolutePath());
				this.myNotepadView.lblNewLabel.setText(this.myNotepadView.model.getFileName());
				if(fileName.endsWith(".txt")) {
					try {
						List<String> allText = Files.readAllLines(file.toPath(), StandardCharsets.UTF_8);
						String result = "";
						for (String line : allText) {
							result+=line;
							result+="\n";
						}
						this.myNotepadView.model.setContent(result);
						this.myNotepadView.textArea.setText(this.myNotepadView.model.getContent());
					} catch (Exception e1) {
						e1.printStackTrace();
					}
				}
			} 
		} else if (command.equals("Save")) {
			if(this.myNotepadView.model.getFileName().length()>0) {
				save(this.myNotepadView.model.getFileName());
			}else {
				int returnVal = fc.showSaveDialog(this.myNotepadView);
				if (returnVal == JFileChooser.APPROVE_OPTION) {
					File file = fc.getSelectedFile();
					save(file.getAbsolutePath());
				} 
			}
		}
	}
	public void save(String fileName) {
		try {
			PrintWriter pw = new PrintWriter(fileName, "UTF-8");
			String data = this.myNotepadView.textArea.getText();
			pw.print(data);
			pw.flush();
			pw.close();
		} catch (FileNotFoundException e1) {
			e1.printStackTrace();
		} catch (UnsupportedEncodingException e1) {
			e1.printStackTrace();
		}
	}
}

package test;

import javax.swing.UIManager;

import view.MyNotepadView;

public class Test {
	public static void main(String[] args) {
		try {
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
			new MyNotepadView();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}