How to read File and write content into JTextArea?

Question

I want to transfer content from a text file into a JTextarea. I suppose my code just needs small adjustments but even through research. I am not able to find out, what is wrong. So far it is just displaying an empty JFrame instead of the text of the file.

this.setSize(this.width, this.height);
this.setVisible(true);
this.jScrollPane = new JScrollPane(this.jTextArea);
this.jPanel = new JPanel();
this.jPanel.setOpaque(true);
this.jTextArea.setVisible(true);

try {
    this.jTextArea = new JTextArea();
    this.jTextArea.read(new InputStreamReader(
        getClass().getResourceAsStream("C:\\wrk\\SapCommerceCloud\\src\\SwingUni\\name")),
        null);

} // catch

    this.add(this.jScrollPane);

And the usage:

public static void main(String[] args) {
    new TextFrame(new File("C:\\wrk\\SapCommerceCloud\\src\\SwingUni\\name"), 500, 500);
}

Answer 1

You have 2 important issues in this code:

• You are creating jScrollPane this.jScrollPane = new JScrollPane(this.jTextArea); before reading the file content using jTextArea
• The method does not work read(new InputStreamReader( getClass().getResourceAsStream("C:\\wrk\\SapCommerceCloud\\src\\SwingUni\\name")), null); Use the one in the following example.

You have to catch the exception to solve the problems

  public class TextAreaDemo extends JFrame {

    private JScrollPane jScrollPane;
    private JTextArea jTextArea ;
    private static final String FILE_PATH="/Users/user/IdeaProjects/StackOverflowIssues/file.txt";

 public TextAreaDemo() {

        try {
            jTextArea = new JTextArea(24, 31);

            jTextArea.read(new BufferedReader(new FileReader(FILE_PATH)), null);

        } catch (Exception e){

            e.printStackTrace();
        }

        jScrollPane = new JScrollPane(this.jTextArea);
        this.add(this.jScrollPane);
        this.setVisible(true);
        this.setSize(400, 200);
    }
    public static void main(String[] args) {
        TextAreaDemo textAreaDemo = new TextAreaDemo();
    }