TextArea: schreiben/lesen

public void öffne()
	{
		FileDialog fd = new FileDialog(frame, "Öffnen", FileDialog.LOAD);
		fd.setFile("*.txt");
		fd.setVisible(true);
		
		String s1 = fd.getDirectory() + fd.getFile();
		File f1 = new File(s1);
		
		BufferedReader reader = null;
		
		if(f1 != null){
			
			frame.textArea.selectAll();
			frame.textArea.replaceRange("", frame.textArea.getSelectionStart(), //clear textArea
					frame.textArea.getSelectionEnd());
		}
			try{
				reader = new BufferedReader(new InputStreamReader(new FileInputStream(f1)));
				String textIn;
				textIn = reader.readLine();
				
				while(textIn != null){
					frame.textArea.append(textIn + "\n");
					textIn = reader.readLine();
				}
				reader.close();
			}
			catch(FileNotFoundException e){
				System.out.println("Datei nicht gefunden" + e);
			}
			catch(IOException e){
				System.out.println("Lesefehler" + e);
			}
		}

public void speichere()
	{
		FileDialog fd = new FileDialog(frame, "Speichern", FileDialog.SAVE);
		fd.setFile("*.txt");
		fd.setVisible(true);
		
		String s2 = fd.getDirectory() + fd.getFile();
		File f2 = new File(s2);
		
		if(fd.getFile() != null)
		{
			BufferedWriter writer = null;
		
			try{
				writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(f2)));
				
				String textOut = frame.textArea.getText();
				
				while(textOut != null){
					writer.write(textOut);
					textOut = frame.textArea.getText();
				}
				writer.close();
			}
			catch(FileNotFoundException e)
			{
				System.out.println("Fehler beim Speichern" + e);
			}
			catch(IOException e)
			{
				System.out.println("Schreibfehler..." + e);
			}
		}
	}

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

import javax.swing.JTextArea;

public class OpenAndSaveInAWT extends Frame implements ActionListener {
	private static PrintStream o = System.out;

	private TextArea tArea = new TextArea();

	private FileDialog openDialog = new FileDialog(this, "Open", FileDialog.LOAD);

	private FileDialog saveDialog = new FileDialog(this, "Save", FileDialog.SAVE);

	private Button openBtn = new Button("Open");

	private Button saveBtn = new Button("Save");

	private ReadandWriteHelpTool helpTool = new ReadandWriteHelpTool();

	public OpenAndSaveInAWT() {
		super("Open and Save in AWT Example");
		this.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
		this.setSize(400, 500);
		this.setLocationByPlatform(true);

		openBtn.addActionListener(this);
		saveBtn.addActionListener(this);

		this.add(openBtn, BorderLayout.NORTH);
		this.add(tArea, BorderLayout.CENTER);
		this.add(saveBtn, BorderLayout.SOUTH);

		this.setVisible(true);
	}

	public static void main(String[] args) {
		new OpenAndSaveInAWT();
	}

	public void actionPerformed(ActionEvent e) {
		if (e.getActionCommand().equals("Open"))
			open();
		else
			save();

	}

	public void open() {
		openDialog.setVisible(true);

		File file;
		if (openDialog.getFile() != null) {
			file = new File(openDialog.getFile());
			try {
				helpTool.read(new FileReader(file), null);
			} catch (FileNotFoundException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}
			tArea.setText(helpTool.getText());
		}
	}

	public void save() {
		saveDialog.setVisible(true);

		File file;
		if (saveDialog.getFile() != null) {
			file = new File(saveDialog.getDirectory(),saveDialog.getFile() + ".txt");
			try {
				helpTool.setText(tArea.getText());
				helpTool.write(new FileWriter(file));
			} catch (FileNotFoundException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	class ReadandWriteHelpTool extends JTextArea {
	}
}

 private ReadandWriteHelpTool helpTool = new ReadandWriteHelpTool();

class ReadandWriteHelpTool extends JTextArea {
    }

frame.textArea.append(textIn + "\n");

System.out.println(textIn + '\n');

frame.textArea.getText();

String textOut = "blablabla";

while(textOut != null){
  writer.write(textOut);
  textOut = frame.textArea.getText();
}

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

import javax.swing.*;

public class OpenAndSaveSwing extends JFrame implements ActionListener {
	private static PrintStream o = System.out;

	private JTextArea tArea = new JTextArea();
	
	private JScrollPane sPane = new JScrollPane(tArea);

	private JFileChooser fChooser = new JFileChooser();

	private JButton openBtn = new JButton("Open");

	private JButton saveBtn = new JButton("Save");
	
	private JPanel btnPanel = new JPanel();

	public OpenAndSaveSwing() {
		super("Open and Save in Swing Example");
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setSize(400, 500);
		this.setLocationByPlatform(true);
		this.setAlwaysOnTop(true);

		GridLayout gl = new GridLayout(1,2);
		btnPanel.setLayout(gl);
		btnPanel.add(openBtn);
		btnPanel.add(saveBtn);
		
		openBtn.addActionListener(this);
		saveBtn.addActionListener(this);
		
		tArea.setLineWrap(true);
		tArea.setWrapStyleWord(true);

		// Falls du das vertikale ScrollBalken immer sehen möchtest
		//sPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
		
		this.add(sPane, BorderLayout.CENTER);
		this.add(btnPanel, BorderLayout.SOUTH);

		this.setVisible(true);
	}

	public static void main(String[] args) {
		try {
			UIManager
					.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
		} catch (Exception e) {
		}
		new OpenAndSaveSwing();
	}

	public void actionPerformed(ActionEvent e) {
		if (e.getActionCommand().equals("Open"))
			open();
		else
			save();
	}

	public void open() {
		int result = fChooser.showOpenDialog(this);

		File file;
		if (result == JFileChooser.APPROVE_OPTION) {
			file = fChooser.getSelectedFile();
			try {
				tArea.read(new FileReader(file), null);
			} catch (FileNotFoundException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	public void save() {
		int result = fChooser.showSaveDialog(this);

		File file;
		if (result == JFileChooser.APPROVE_OPTION) {
			file = fChooser.getSelectedFile();
			if (!file.getAbsolutePath().endsWith(".txt"))
				file = new File(file.getAbsolutePath() + ".txt");
			try {
				tArea.write(new FileWriter(file));
			} catch (FileNotFoundException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
}