从控制台打印行到 GUI 文本框/lebel

Question

I'm trying to build user interface for my automatic test in webdriver.

My question how can I print all the console line in the label or textbox ?

Method set on the button:

    public void AutologinTest(ActionEvent event){
    try {
        Runtime rt = Runtime.getRuntime();
        Process pr = rt.exec("C:\\lottotest2\\workspace\\Lotteryscript\\Autologin.bat");
        BufferedReader input = new BufferedReader(
                new InputStreamReader(pr.getInputStream()));
        String line = null;
        while ((line = input.readLine()) != null)
            System.out.println(line);

    } catch (Exception e) {
        System.out.println(e.toString());
        e.printStackTrace();
    }

Answer 1

You can use System.setOut(PrintStream stream):

PrintStream ps = new PrintStream(
    new OutputStream() {
        public void write(int c){
            myLabel.setText(myLabel.getText() + (char) c);
        }
    }
);

System.setOut(ps);

System.out.println("Hello!"); // will print on the label

Answer 2

You can do something like this to redirect STDOUT to TextArea or other control:

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.TextArea;
import javafx.stage.Stage;

import java.io.PrintStream;

public class Main22 extends Application {
    @Override
    public void start(Stage primaryStage) throws Exception {
        TextArea textArea = new TextArea();

        primaryStage.setScene(new Scene(textArea));
        primaryStage.show();

        System.setOut(new PrintStream(System.out) {
            @Override
            public void write(byte[] buf, int off, int len) {
                super.write(buf, off, len);

                String msg = new String(buf, off, len);

                textArea.setText(textArea.getText() + msg);
            }
        });

        System.out.println("bla-bla-bla");
        System.out.println("Yet one line!");
    }
}

As you can see I just override write method of PrintStream and append incoming text message for text in TextArea .

FYI: I don't recommend to use TextArea for display logs because it have very poor performance when trying to process large text.