java 项目 添加 log4j

public static void main(String[] args) throws Exception {
InputStream in = FXMLExample.class.getResourceAsStream("/log4j.properties");
PropertyConfigurator.configure(in);
in.close();
Application.launch();
}

### set log levels ###
log4j.rootLogger = TRACE , history

log4j.appender.history = org.apache.log4j.DailyRollingFileAppender
log4j.appender.history.File = logs/history
log4j.appender.history.datePattern='-'yyyy-MM-dd'.log'
log4j.appender.history.Append = true
log4j.appender.history.layout = org.apache.log4j.PatternLayout
log4j.appender.history.layout.ConversionPattern = %d %t %-5p %l - %m%n
log4j.appender.history.Threshold=TRACE