您只需要更改默认输出…

public static void main(String[] args) throws UnsupportedEncodingException

{

ByteArrayOutputStream bos = new ByteArrayOutputStream();

System.setOut(new PrintStream(bos));

System.out.println("outputing an example");

JOptionPane.showMessageDialog(null, "Captured: " + bos.toString("UTF-8"));

}

public static void main(String[] args) throws UnsupportedEncodingException

{

CapturePane capturePane = new CapturePane();

System.setOut(new PrintStream(new StreamCapturer("STDOUT", capturePane, System.out)));

System.out.println("Output test");

JFrame frame = new JFrame();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setLayout(new BorderLayout());

frame.add(capturePane);

frame.setSize(200, 200);

frame.setLocationRelativeTo(null);

frame.setVisible(true);

System.out.println("More output test");

}

public static class CapturePane extends JPanel implements Consumer {

private JLabel output;

public CapturePane() {

setLayout(new BorderLayout());

output = new JLabel("");

add(new JScrollPane(output));

}

@Override

public void appendText(final String text) {

if (EventQueue.isDispatchThread()) {

output.setText(output.getText() + text + "
");

} else {

EventQueue.invokeLater(new Runnable() {

@Override

public void run() {

appendText(text);

}

});

}

}

}

public interface Consumer {

public void appendText(String text);

}

public static class StreamCapturer extends OutputStream {

private StringBuilder buffer;

private String prefix;

private Consumer consumer;

private PrintStream old;

public StreamCapturer(String prefix, Consumer consumer, PrintStream old) {

this.prefix = prefix;

buffer = new StringBuilder(128);

buffer.append("[").append(prefix).append("] ");

this.old = old;

this.consumer = consumer;

}

@Override

public void write(int b) throws IOException {

char c = (char) b;

String value = Character.toString(c);

buffer.append(value);

if (value.equals("

")) {

consumer.appendText(buffer.toString());

buffer.delete(0, buffer.length());

buffer.append("[").append(prefix).append("] ");

}

old.print(c);

}

}