15.log4j.properties例子:log4j.appender.file.ImmediateFlush
packagecom.toogen.log4j;importorg.apache.log4j.Level;importorg.apache.log4j.Logger;publicclassHelloLog4JToogen{//构造记录器,形参是记录器所在的类,表示要在该类做日志privatestaticLoggerlogger=Logger.getLogger(HelloLog4JToogen.c