Java Reading text file content into a JTextArea help

[Java] Reading text file content into a JTextArea help - Printable Version

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+---- Thread: [Java] Reading text file content into a JTextArea help (/showthread.php?tid=5817356)

Reading text file content into a JTextArea help - friiz1337 - Mar 28, 2018

Here is my code and I can't seem to get the text file content to display when I run my program. Also I tried removing the txtNewNote.setEditable(false) still didn't work.

Code 
JTextArea txtNewNote = new JTextArea();

if ("Savee".equals(ae.getActionCommand())) {

            int dialogButton = JOptionPane.YES_NO_OPTION;

            JOptionPane.showConfirmDialog(null, "Do you want to save?", "", dialogButton);

            txtNewNote.setEditable(false);

            String fileName = "CourseDetails.txt";

            String line;

            try { // writing

                BufferedWriter writer = new BufferedWriter(new FileWriter(fileName, true));

                txtNewNote.write(writer);

                writer.newLine();

                writer.close();

            } catch (IOException ex) {

                System.out.println("Error");

                // reading

                try (BufferedReader myReader = new BufferedReader(new FileReader("CourseDetails.txt"))) {

                    String text = null;

                    while ((text = myReader.readLine()) != null) {

                        txtNewNote.read(myReader, "CourseDetails");

                    }

                } catch (IOException exp) {

                    exp.printStackTrace();

                }

RE: Reading text file content into a JTextArea help - m0noxide - Mar 28, 2018

Code 
if ("Savee".equals(ae.getActionCommand())) {

Could it be because you misspelled save?

RE: Reading text file content into a JTextArea help - friiz1337 - Mar 28, 2018

(Mar 28, 2018 12:06 PM)m0noxide Wrote:
Code
if ("Savee".equals(ae.getActionCommand())) {

Could it be because you misspelled save?

It's not it. I've named my button "Savee".

(Mar 28, 2018 05:01 PM)friiz1337 Wrote: It's not it. I've named my button "Savee".

When the button is pressed it saves the info into a text file and that info I want to be displayed in the same text area where I write it. Basically a frame where I store notes on a text area :)

RE: Reading text file content into a JTextArea help - ✔ Soufian ✔ - Mar 28, 2018

Try this to read, it must work:

Code 
try {

        FileReader file = new FileReader("CourseDetails.txt");

        BufferedReader br = new BufferedReader(file);

        String line = br.readLine();

        while (line != null) {

            System.out.println(line);

            line = br.readLine();

        }

        br.close();

    } catch (IOException e) {

        System.out.println("Error: " + e);

    }

RE: Reading text file content into a JTextArea help - friiz1337 - Mar 28, 2018

(Mar 28, 2018 05:06 PM)✔ Soufian ✔ Wrote: Try this to read, it must work:

Code
try { FileReader file = new FileReader("CourseDetails.txt"); BufferedReader br = new BufferedReader(file); String line = br.readLine(); while (line != null) { System.out.println(line); line = br.readLine(); } br.close(); } catch (IOException e) { System.out.println("Error: " + e); }

Doesn't work. And I have to change the string name since I've already defined it before.
What I want to do is whenever I type a text into that text area I want the text to be saved on a txt file and also to be read and shown by the text area. In short I want a text file(textarea) inside my program(frame)

(Mar 28, 2018 05:23 PM)friiz1337 Wrote: Doesn't work. And I have to change the string name since I've already defined it before.
What I want to do is whenever I type a text into that text area I want the text to be saved on a txt file and also to be read and shown by the text area. In short I want a text file(textarea) inside my program(frame)

I've done the saving to a txt file part. But reading it and getting the output on the textarea is the big problem :/

RE: Reading text file content into a JTextArea help - friiz1337 - Mar 30, 2018

Still struggling to figure out how to do it :/

RE: Reading text file content into a JTextArea help - RootFolder - Mar 31, 2018

Read from file

Code 
    public static String readTextFromFile( String filepath ) throws IOException

    {

        BufferedReader reader = new BufferedReader( new FileReader( new File( filepath )));

        StringBuilder textFromFile = new StringBuilder();

        String line = "";

        while( ( line = reader.readLine() ) != null )

        {

            textFromFile.append( line + "\n" );

        }

        return textFromFile.toString();

    }

Write to file

Code 
public static void writeToFile( String filepath, String textToWrite ) throws IOException

    {

        PrintWriter writer = new PrintWriter( new File( filepath ));

        writer.write( textToWrite );

        writer.close();

    }

Frame, don't know why i threw that one in..
Spoiler (Click to View)

Code 
public static void main( String[] args ) throws Exception

    {

        final String testFile = "test.txt";

        JFrame frame = new JFrame();

        JTextArea textArea = new JTextArea();

        JScrollPane scrollPane = new JScrollPane( textArea, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER );

        JButton load = new JButton( "Load text from test.txt" );

        JButton save = new JButton( "Save to test.txt" );

        JPanel buttonPanel = new JPanel();

        buttonPanel.add( load );

        buttonPanel.add( save );

        frame.add( scrollPane, BorderLayout.CENTER );

        frame.add( buttonPanel, BorderLayout.SOUTH );

        load.addActionListener( new ActionListener() {

            public void actionPerformed( ActionEvent event )

            {

                try

                {

                    String text = readTextFromFile( testFile );

                    textArea.setText( text );

                    textArea.validate();

                }

                catch( IOException exception )

                {

                    System.err.println( "Couldn't read from \"" + testFile + "\"" );

                    exception.printStackTrace();

                }

            }

        });

        save.addActionListener( new ActionListener() {

            public void actionPerformed( ActionEvent event )

            {

                try

                {

                    writeToFile( testFile, textArea.getText() );

                }

                catch( IOException exception )

                {

                    System.err.println( "Couldn't write to \"" + testFile + "\"" );

                    exception.printStackTrace();

                }

            }

        });

        frame.setSize( 500, 500 );

        frame.setVisible( true );

    }

RE: Reading text file content into a JTextArea help - Conejo - Apr 3, 2018

You can try something like that

Code 
public class ReadFileExample1 {

 private static final String FILENAME = "E:\\test\\filename.txt";

 public static void main(String[] args) {

 BufferedReader br = null;

 FileReader fr = null;

 try {

 //br = new BufferedReader(new FileReader(FILENAME));

 fr = new FileReader(FILENAME);

 br = new BufferedReader(fr);

 String sCurrentLine;

 while ((sCurrentLine = br.readLine()) != null) {

 System.out.println(sCurrentLine);

 }

 } catch (IOException e) {

 e.printStackTrace();

 } finally {

 try {

 if (br != null)

 br.close();

 if (fr != null)

 fr.close();

 } catch (IOException ex) {

 ex.printStackTrace();

 }

 }

 }

}