public Log4jRequestHandler() 
{
         
    this.setTitle("log4j");
    this.setDescription("log4j configuration");
    this.setHandledPath("/log4j/");
}

Creates a new Log4jRequestHandler object

 public boolean handleRequest(String request,
    Writer out) 
{
    String path = "";
    String query = null;
    String name;
    try {
      // check request url
      URL url = new URL("http://localhost"+request);
      path = url.getPath();
      query = url.getQuery();
      if (path.startsWith(this.getHandledPath()) == false) {
        return false;
      }
      out.write("HTTP/1.0 200 OK\r\n");
      out.write("Content-type: text/html\r\n\r\n");
      out.write("< HTML >< HEAD >< TITLE >" + this.getTitle() + "< /TITLE >< /HEAD >\r\n");
      out.write("< BODY >< H1 >log4j< /H1 >\r\n");
      out.write(this.getDescription() + "< br >< br >\r\n");
      // handle a request with query
      if ((query != null) && (query.length()  >= 0)) {
        StringTokenizer st = new StringTokenizer(query, "&");
        String cmd;
        String catname;
        String catval;
        int idx;
        while (st.hasMoreTokens()) {
          cmd = st.nextToken();
          idx = cmd.indexOf("=");
          catname = cmd.substring(0, idx);
          catval = cmd.substring(idx+1, cmd.length());
          if (catname.equalsIgnoreCase("root"))
            Category.getRoot().setPriority(Priority.toPriority(catval));
          else
            Category.getInstance(catname).setPriority(Priority.toPriority(catval));
        }
      }
      // output category information in a form with a simple table
      out.write("< form name=\"Formular\" ACTION=\""+this.getHandledPath()+"\" METHOD=\"PUT\" >");
      out.write("< table cellpadding=4 >\r\n");
      out.write(" < tr >\r\n");
      out.write("  < td >< b >Category< /b >< /td >\r\n");
      out.write("  < td >< b >Priority< /b >< /td >\r\n");
      out.write("  < td >< b >Appender< /b >< /td >\r\n");
      out.write(" < /tr >\r\n");
      // output for root category
      Category cat = Category.getRoot();
      out.write(" < tr >< td >root< /td >\r\n");
      out.write("  < td >\r\n");
      out.write("   < select size=1 name=\""+ cat.getName() +"\" >");
      for (int i = 0; i <  prios.length; i++) {
        if (cat.getChainedPriority().toString().equals(prios[i].toString()))
          out.write("< option selected >"+prios[i].toString());
        else
          out.write("< option >"+prios[i].toString());
      }
      out.write("< /select >\r\n");
      out.write("  < /td >\r\n");
      out.write("  < td >\r\n");
      for (Enumeration apds = cat.getAllAppenders(); apds.hasMoreElements();) {
        Appender apd = (Appender)apds.nextElement();
        name = apd.getName();
        if (name == null)
          name = "< i >(no name)< /i >";
        out.write(name);
        if (apd instanceof AppenderSkeleton) {
          try {
            AppenderSkeleton apskel = (AppenderSkeleton)apd;
            out.write(" [" + apskel.getThreshold().toString() + "]");
          } catch (Exception ex) {
          }
        }
        if (apds.hasMoreElements())
          out.write(",  ");
      }
      out.write("  < /td >\r\n");
      out.write(" < /tr >\r\n");
      // output for all other categories
      for (Enumeration en = Category.getCurrentCategories(); en.hasMoreElements();) {
        cat = (Category)en.nextElement();
        out.write(" < tr >\r\n");
        out.write("  < td >" + cat.getName() + "< /td >\r\n");
        out.write("  < td >\r\n");
        out.write("   < select size=1 name=\""+ cat.getName() +"\" >");
        for (int i = 0; i <  prios.length; i++) {
          if (cat.getChainedPriority().toString().equals(prios[i].toString()))
            out.write("< option selected >"+prios[i].toString());
          else
            out.write("< option >"+prios[i].toString());
        }
        out.write("< /select >\r\n");
        out.write("  < /td >\r\n");
        out.write("  < td >\r\n");
        for (Enumeration apds = cat.getAllAppenders(); apds.hasMoreElements();) {
          Appender apd = (Appender)apds.nextElement();
          name = apd.getName();
          if (name == null)
            name = "< i >(no name)< /i >";
          out.write(name);
          if (apd instanceof AppenderSkeleton) {
            try {
              AppenderSkeleton apskel = (AppenderSkeleton)apd;
              out.write(" [" + apskel.getThreshold().toString() + "]");
            } catch (Exception ex) {
            }
          }
          if (apds.hasMoreElements())
            out.write(",  ");
        }
        out.write("  < /td >\r\n");
        out.write(" < /tr >\r\n");
      }
      out.write("< /table >\r\n");
      out.write("< input type=submit value=\"Submit\" >");
      out.write("< /form >");
      out.write("< /BODY >< /HTML >\r\n");
      out.flush();
      return true;
    } catch (Exception ex) {
      return false;
    }
}

Handles the given request and writes the reply to the given out-stream.