Redirect standard output in Java

--------------- Redirect.java ------------------

import java.io.PrintStream;
import java.io.FileOutputStream;
import java.io.FileDescriptor;
import java.io.File;
import java.io.ByteArrayOutputStream;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Date;
import java.text.SimpleDateFormat;

import javafx.application.*;
import javafx.scene.*;
import javafx.scene.image.*;
import javafx.scene.paint.*;
import javafx.scene.text.*;
import javafx.scene.canvas.*;
import javafx.embed.swing.*;

public class Redirect {

  static void systemOut() { systemOut("output.txt", Charset.defaultCharset(), Charset.defaultCharset()); }
  static void systemOut(String fileName, Charset charSetFile, Charset charSetConsole) {
    try {
      String base = StandardCharsets.UTF_8.name();
      PrintStream st = new PrintStream(new ByteArrayOutputStream() {
        PrintStream psFile = new PrintStream(new FileOutputStream(fileName));
        PrintStream psConsole = new PrintStream(new FileOutputStream(FileDescriptor.out));
        { psFile.write((new SimpleDateFormat("dd.MM.yy HH:mm:ss").format(new Date()) +
            System.getProperty("line.separator")).getBytes(charSetFile)); }

        @Override
        public void flush() {
          try {
            //writeTo(psFile);  //Without decoding
            //writeTo(psConsole);
            String s = toString(base);
            psFile.write(s.getBytes(charSetFile));
            psConsole.write(s.getBytes(charSetConsole));
          } catch (Exception e) { e.printStackTrace(); }
          reset();
        }

        @Override
        public void close() {
          psFile.close();
        }
      }, true, base);
      System.setOut(st);
      System.setErr(st);
    } catch (Exception e) { e.printStackTrace(); }
  }

  public static void main(String[] args) {
    systemOut();
    new JFXPanel();
    Platform.runLater(() -> {
      int w = 79, h = 25;
      Canvas canvas = new Canvas(w, h);
      GraphicsContext gc = canvas.getGraphicsContext2D();
      gc.setFill(Color.WHITE);
      gc.fillRect(0, 0, w, h);
      gc.setFill(Color.BLACK);
      gc.setFont(Font.font(24));
      gc.fillText("Java", 16, 19);
      WritableImage image = canvas.snapshot(new SnapshotParameters(), null);
      PixelReader pixelReader = image.getPixelReader();
      for (int y = 0; y < h; y++) {
        for (int x = 0; x < w; x++) {
          System.out.print(pixelReader.getColor(x, y).getBrightness() < 1 ? "*" : " ");
        }
        System.out.println();
      }
      Platform.exit();
      System.exit(0);
    });
  }
}

Download ZIP

Back