1 import java.io.*;
   2 import java.awt.*;
   3 import java.awt.event.*;
   4 import javax.swing.*;
   5 import javax.swing.text.*;
   6 
   7 public class ConsoleOutputStream extends OutputStream {
   8   private Document              document     = null;
   9   private ByteArrayOutputStream outputStream = new ByteArrayOutputStream(256);
  10   private PrintStream           ps           = null;
  11 
  12   public ConsoleOutputStream(Document document, PrintStream ps) {
  13     this.document = document;
  14     this.ps = ps;
  15   }
  16 
  17   public void write(int b) {
  18     outputStream.write(b);
  19   }
  20 
  21   public void flush() throws IOException {
  22     super.flush();
  23 
  24     try {
  25       if (document != null) {
  26         document.insertString(document.getLength(),
  27           new String(outputStream.toByteArray()), null);
  28       }
  29 
  30       if (ps != null) {
  31         ps.write(outputStream.toByteArray());
  32       }
  33 
  34       outputStream.reset();
  35     }
  36     catch(Exception e) {}
  37   }
  38 
  39   public static void main(String[] args) {
  40     JTextArea   textArea   = new JTextArea();
  41     JScrollPane scrollPane = new JScrollPane(textArea);
  42 
  43     JFrame      frame      = new JFrame("Redirect Output");
  44     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  45     frame.getContentPane().add(scrollPane);
  46     frame.setSize(300, 600);
  47     frame.setVisible(true);
  48 
  49     System.setOut(new PrintStream(
  50       new ConsoleOutputStream(textArea.getDocument(), System.out), true));
  51     System.setErr(new PrintStream(
  52       new ConsoleOutputStream(textArea.getDocument(), null), true));
  53 
  54     Timer timer = new Timer(1000, new ActionListener() {
  55       public void actionPerformed(ActionEvent e) {
  56         System.out.println(new java.util.Date().toString());
  57         System.err.println(System.currentTimeMillis());
  58       }
  59     });
  60     timer.start();
  61   }
  62 }