Note that all option keys are case sensitive.

 public  void activateOptions() 
{

}

No options to activate.

  void appendThrowableAsHTML(String[] s,
    StringBuffer sbuf) 
{
    if(s != null) {
      int len = s.length;
      if(len == 0)
	return;
      sbuf.append(Transform.escapeTags(s[0]));
      sbuf.append(Layout.LINE_SEP);
      for(int i = 1; i <  len; i++) {
	sbuf.append(TRACE_PREFIX);
	sbuf.append(Transform.escapeTags(s[i]));
	sbuf.append(Layout.LINE_SEP);
      }
    }
}

 public String format(LoggingEvent event) 
{
    if(sbuf.capacity()  > MAX_CAPACITY) {
      sbuf = new StringBuffer(BUF_SIZE);
    } else {
      sbuf.setLength(0);
    }
    sbuf.append(Layout.LINE_SEP + "< tr >" + Layout.LINE_SEP);
    sbuf.append("< td >");
    sbuf.append(event.timeStamp - LoggingEvent.getStartTime());
    sbuf.append("< /td >" + Layout.LINE_SEP);
    String escapedThread = Transform.escapeTags(event.getThreadName());
    sbuf.append("< td title=\"" + escapedThread + " thread\" >");
    sbuf.append(escapedThread);
    sbuf.append("< /td >" + Layout.LINE_SEP);
    sbuf.append("< td title=\"Level\" >");
    if (event.getLevel().equals(Level.DEBUG)) {
      sbuf.append("< font color=\"#339933\" >");
      sbuf.append(Transform.escapeTags(String.valueOf(event.getLevel())));
      sbuf.append("< /font >");
    }
    else if(event.getLevel().isGreaterOrEqual(Level.WARN)) {
      sbuf.append("< font color=\"#993300\" >< strong >");
      sbuf.append(Transform.escapeTags(String.valueOf(event.getLevel())));
      sbuf.append("< /strong >< /font >");
    } else {
      sbuf.append(Transform.escapeTags(String.valueOf(event.getLevel())));
    }
    sbuf.append("< /td >" + Layout.LINE_SEP);
    String escapedLogger = Transform.escapeTags(event.getLoggerName());
    sbuf.append("< td title=\"" + escapedLogger + " category\" >");
    sbuf.append(escapedLogger);
    sbuf.append("< /td >" + Layout.LINE_SEP);
    if(locationInfo) {
      LocationInfo locInfo = event.getLocationInformation();
      sbuf.append("< td >");
      sbuf.append(Transform.escapeTags(locInfo.getFileName()));
      sbuf.append(':");
      sbuf.append(locInfo.getLineNumber());
      sbuf.append("< /td >" + Layout.LINE_SEP);
    }
    sbuf.append("< td title=\"Message\" >");
    sbuf.append(Transform.escapeTags(event.getRenderedMessage()));
    sbuf.append("< /td >" + Layout.LINE_SEP);
    sbuf.append("< /tr >" + Layout.LINE_SEP);
    if (event.getNDC() != null) {
      sbuf.append("< tr >< td bgcolor=\"#EEEEEE\" style=\"font-size : xx-small;\" colspan=\"6\" title=\"Nested Diagnostic Context\" >");
      sbuf.append("NDC: " + Transform.escapeTags(event.getNDC()));
      sbuf.append("< /td >< /tr >" + Layout.LINE_SEP);
    }
    String[] s = event.getThrowableStrRep();
    if(s != null) {
      sbuf.append("< tr >< td bgcolor=\"#993300\" style=\"color:White; font-size : xx-small;\" colspan=\"6\" >");
      appendThrowableAsHTML(s, sbuf);
      sbuf.append("< /td >< /tr >" + Layout.LINE_SEP);
    }
    return sbuf.toString();
}

 public String getContentType() 
{
    return "text/html";
}

Returns the content type output by this layout, i.e "text/html".

 public String getFooter() 
{
    StringBuffer sbuf = new StringBuffer();
    sbuf.append("< /table >" + Layout.LINE_SEP);
    sbuf.append("< br >" + Layout.LINE_SEP);
    sbuf.append("< /body >< /html >");
    return sbuf.toString();
}

Returns the appropriate HTML footers.

 public String getHeader() 
{
    StringBuffer sbuf = new StringBuffer();
    sbuf.append("< !DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\" >"  + Layout.LINE_SEP);
    sbuf.append("< html >" + Layout.LINE_SEP);
    sbuf.append("< head >" + Layout.LINE_SEP);
    sbuf.append("< title >" + title + "< /title >" + Layout.LINE_SEP);
    sbuf.append("< style type=\"text/css\" >"  + Layout.LINE_SEP);
    sbuf.append("< !--"  + Layout.LINE_SEP);
    sbuf.append("body, table {font-family: arial,sans-serif; font-size: x-small;}" + Layout.LINE_SEP);
    sbuf.append("th {background: #336699; color: #FFFFFF; text-align: left;}" + Layout.LINE_SEP);
    sbuf.append("-- >" + Layout.LINE_SEP);
    sbuf.append("< /style >" + Layout.LINE_SEP);
    sbuf.append("< /head >" + Layout.LINE_SEP);
    sbuf.append("< body bgcolor=\"#FFFFFF\" topmargin=\"6\" leftmargin=\"6\" >" + Layout.LINE_SEP);
    sbuf.append("< hr size=\"1\" noshade >" + Layout.LINE_SEP);
    sbuf.append("Log session start time " + new java.util.Date() + "< br >" + Layout.LINE_SEP);
    sbuf.append("< br >" + Layout.LINE_SEP);
    sbuf.append("< table cellspacing=\"0\" cellpadding=\"4\" border=\"1\" bordercolor=\"#224466\" width=\"100%\" >" + Layout.LINE_SEP);
    sbuf.append("< tr >" + Layout.LINE_SEP);
    sbuf.append("< th >Time< /th >" + Layout.LINE_SEP);
    sbuf.append("< th >Thread< /th >" + Layout.LINE_SEP);
    sbuf.append("< th >Level< /th >" + Layout.LINE_SEP);
    sbuf.append("< th >Category< /th >" + Layout.LINE_SEP);
    if(locationInfo) {
      sbuf.append("< th >File:Line< /th >" + Layout.LINE_SEP);
    }
    sbuf.append("< th >Message< /th >" + Layout.LINE_SEP);
    sbuf.append("< /tr >" + Layout.LINE_SEP);
    return sbuf.toString();
}

Returns appropriate HTML headers.

 public boolean getLocationInfo() 
{
    return locationInfo;
}

Returns the current value of the LocationInfo option.

 public String getTitle() 
{
    return title;
}

Returns the current value of the Title option.

 public boolean ignoresThrowable() 
{
    return false;
}

The HTML layout handles the throwable contained in logging events. Hence, this method return false.

 public  void setLocationInfo(boolean flag) 
{
                                                                                                                  
    locationInfo = flag;
}

The LocationInfo option takes a boolean value. By default, it is set to false which means there will be no location information output by this layout. If the the option is set to true, then the file name and line number of the statement at the origin of the log statement will be output.

If you are embedding this layout within an org.apache.log4j.net.SMTPAppender then make sure to set the LocationInfo option of that appender as well.

 public  void setTitle(String title) 
{
    this.title = title;
}

The Title option takes a String value. This option sets the document title of the generated HTML document.

Defaults to 'Log4J Log Messages'.