Redirect Console Output to JavaFX TextArea?


Question

I want to show the console output in a JavaFX TextArea... unfortunately I cannot find any working example for JavaFX but only for Java Swing, which not seems to work in my case.

EDIT:

I tried to follow this example: http://unserializableone.blogspot.ch/2009/01/redirecting-systemout-and-systemerr-to.html

and extended my code as shown below. However, there is no console output anymore in my Eclipse IDE but also no output in my TextArea. Any idea where I am doing wrong?

public class Activity extends OutputStream implements Initializable {

@FXML
public static TextArea taRecentActivity;

public Activity() {
    // TODO Auto-generated constructor stub
}

@Override
public void initialize(URL location, ResourceBundle resources) {

    OutputStream out = new OutputStream() {
        @Override
        public void write(int b) throws IOException {
            updateTextArea(String.valueOf((char) b));
        }

        @Override
        public void write(byte[] b, int off, int len) throws IOException {
            updateTextArea(new String(b, off, len));
        }

        @Override
        public void write(byte[] b) throws IOException {
            write(b, 0, b.length);
        }
    };

    System.setOut(new PrintStream(out, true));
    System.setErr(new PrintStream(out, true));
}

private void updateTextArea(final String text) {
    SwingUtilities.invokeLater(new Runnable() {
        public void run() {
            taRecentActivity.appendText(text);
        }
    });
}

@Override
public void write(int arg0) throws IOException {
    // TODO Auto-generated method stub

}
}
1
3
11/16/2014 4:00:28 PM

Accepted Answer

I just did this and it worked. Though it was very slow with large amounts of text.

public void appendText(String str) {
    Platform.runLater(() -> textField.appendText(str));
}

and

@Override
public void initialize(URL location, ResourceBundle resources) {
    OutputStream out = new OutputStream() {
        @Override
        public void write(int b) throws IOException {
            appendText(String.valueOf((char) b));
        }
    };
    System.setOut(new PrintStream(out, true));
}
6
11/16/2014 8:19:37 PM

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