Dimitri PISSARENKO wrote:
>Hello!
>
>Is it possible to write an appender which prints the log messages in a
>textarea of a window?
>
>If yes, are there any examples for that?
>
>Thanks
>
>Dimitri PIssarenko
>
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>
>
>
I wrote one of those a little while ago:
// basic imports
import java.util.*;
import java.io.*;
import java.text.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;
// log4j-specific imports
import org.apache.log4j.*;
import org.apache.log4j.spi.LoggingEvent;
public class Log4JGUIConsoleSessionLog extends AppenderSkeleton {
protected static SimpleAttributeSet simpleAttributeSet = new
SimpleAttributeSet();
protected int width;
protected int height;
protected int tlcornerXcoord;
protected int tlcornerYcoord;
protected String resetScrollPoint = "false";
protected Document document;
protected Log4JConsoleSessionLogFrame logFrame = null;
public Log4JGUIConsoleSessionLog() {
super();
}
public void close() {
}
public boolean requiresLayout() {
return true;
}
public Layout getLayout() {
return layout;
}
public void setLayout(Layout layout) {
this.layout=layout;
}
public void setName(String name) {
this.name = name;
}
// Java bean-style get/set methods for parameters
public int getWidth() {
return width;
}
public void setWidth(int width) {
this.width = width;
}
public int getHeight() {
return height;
}
public void setHeight(int height) {
this.height = height;
}
public int getTlcornerXcoord() {
return tlcornerXcoord;
}
public void setTlcornerXcoord(int tlcornerXcoord) {
this.tlcornerXcoord = tlcornerXcoord;
}
public int getTlcornerYcoord() {
return tlcornerYcoord;
}
public void setTlcornerYcoord(int tlcornerYcoord) {
this.tlcornerYcoord = tlcornerYcoord;
}
public String getResetScrollPoint() {
return resetScrollPoint;
}
public void setResetScrollPoint(String resetScrollPoint) {
this.resetScrollPoint = resetScrollPoint;
}
/**
* Append the event's message to the Document
*/
protected void append(LoggingEvent event) {
if (logFrame == null) {
logFrame = new
Log4JConsoleSessionLogFrame(width, height);
document = logFrame.getDocument();
// Center the frame and show it
logFrame.validate();
logFrame.pack();
Dimension screenSize =
Toolkit.getDefaultToolkit().getScreenSize();
logFrame.setLocation(tlcornerXcoord,tlcornerYcoord);
logFrame.setVisible(true);
}
try {
String text = getLayout().format(event);
document.insertString(document.getLength(),
text, simpleAttributeSet);
if ("true".equals(resetScrollPoint)) {
logFrame.getJTextArea().setCaretPosition(document.getLength());
}
}
catch (BadLocationException ble) {
ble.printStackTrace();
}
}
class Log4JConsoleSessionLogFrame extends JFrame {
protected Document document = null;
protected JTextArea textArea = new JTextArea();
public Log4JConsoleSessionLogFrame(int width, int height) {
super("Log4JConsoleSessionLog");
setTitle("Log4JConsoleSessionLog");
setBackground(Color.white);
getContentPane().setLayout(new BorderLayout());
JPanel topPanel = new JPanel();
topPanel.setLayout(new BorderLayout());
getContentPane().add(topPanel, BorderLayout.CENTER);
textArea.setEditable(false);
document = textArea.getDocument();
JScrollPane scrollPane = new JScrollPane(textArea);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
//scrollPane.setPreferredSize(new Dimension(800,
500));
scrollPane.setPreferredSize(new Dimension(width,
height));
topPanel.add(scrollPane, BorderLayout.CENTER );
}
public Document getDocument() {
return document;
}
public JTextArea getJTextArea() {
return textArea;
}
}
}
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