log4j source code, there are many ideas we can draw on.

logging-log4j-1.2.14
....................\build
....................\.....\manifest.mf
....................\.....\package-list
....................\build.properties.sample
....................\build.xml
....................\contribs
....................\........\CekiGulcu
....................\........\.........\AppenderTable.java
....................\........\.........\Transform.java
....................\........\CONTENTS
....................\........\EirikLygre
....................\........\..........\DailyFileAppender1.java
....................\........\..........\mail-2001-01-18
....................\........\JamesHouse
....................\........\..........\LogTextPanel.java
....................\........\..........\LogTextPanelExample.java
....................\........\..........\mail-2001-01-23
....................\........\..........\TextPanelAppender.java
....................\........\Jamie Tsao
....................\........\..........\JMSQueueAppender.java
....................\........\..........\mail-2001-06-20
....................\........\JimMoore
....................\........\........\LoggingOutputStream.java
....................\........\........\mail-2001-03-12T1326
....................\........\........\mail-2001-03-12T1454
....................\........\........\mail-2001-03-13T0646
....................\........\KevinSteppe
....................\........\...........\CompositeRollingAppender.java
....................\........\...........\JDBCTest.java
....................\........\...........\mail-2001-02-01
....................\........\...........\mail-2002-03-27.txt
....................\........\KitchingSimon
....................\........\.............\DatagramStringAppender.java
....................\........\.............\DatagramStringWriter.java
....................\........\.............\logconfig.xml
....................\........\.............\mail-2001-02-07
....................\........\.............\SingleLineTracerPrintWriter.java
....................\........\.............\udpserver.pl
....................\........\LeosLiterak
....................\........\...........\mail
....................\........\...........\TempFileAppender.java
....................\........\MarkDouglas
....................\........\...........\Log.txt
....................\........\...........\mail-2001-01-17
....................\........\...........\SocketNode2.java
....................\........\...........\SocketServer2.java
....................\........\SvenReimers
....................\........\...........\gui
....................\........\...........\...\examples
....................\........\...........\...\........\TextPaneAppenderExample.java
....................\........\...........\...\JListView.java
....................\........\...........\...\JTableAppender.java
....................\........\...........\...\TextPaneAppender.java
....................\........\ThomasFenner
....................\........\............\code_example1.java
....................\........\............\code_example2.java
....................\........\............\configfile_example.txt
....................\........\............\JDBCAppender.java
....................\........\............\JDBCConnectionHandler.java
....................\........\............\JDBCIDHandler.java
....................\........\............\JDBCLogger.java
....................\........\............\Log4JTest.java
....................\........\VolkerMentzner
....................\........\..............\HTTPRequestHandler.java
....................\........\..............\Log4jRequestHandler.java
....................\........\..............\mail-03-05-2001
....................\........\..............\PluggableHTTPServer.java
....................\........\..............\RootRequestHandler.java
....................\........\..............\UserDialogRequestHandler.java
....................\dist
....................\....\classes
....................\....\.......\examples
....................\....\.......\........\customLevel
....................\....\.......\........\

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