log4j source code, you can download can be referenced

apache-log4j-1.2.16\BUILD-INFO.txt
...................\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
...................\........\...ie Tsao\JMSQueueAppender.java
...................\........\..........\mail-2001-06-20
...................\........\.imMoore\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
...................\........\.itchingSimon\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
...................\examples\customLevel\XLevel.java
...................\........\factor.html
...................\........\factor.lcf
...................\........\lf5\index.html
...................\........\...\InitUsingDefaultConfigurator\InitUsingDefaultConfigurator.java
...................\........\...\.........Log4JProperties\InitUsingLog4JProperties.java
...................\........\...\........................\log4j.properties
...................\........\...\.........MultipleAppenders\example.properties
...................\........\...\..........................\InitUsingMultipleAppenders.java
...................\........\...\.........PropertiesFile\example.properties
...................\........\...\.......................\InitUsingPropertiesFile.java
...................\........\...\.........XMLPropertiesFile\example.xml
...................\........\...\..........................\InitUsingXMLPropertiesFile.java
...................\........\...\UsingL

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