有没有办法定义默认布局？

Question

# Root logger option
log4j.rootLogger=ALL, stdout, A1
log4j.logger.org.apache.jsp=ALL, stdout, A1

# Direct log messages to stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} [%p] [%c:%L] - %m%n

# LOG4J daily rolling log files configuration
log4j.appender.A1=org.apache.log4j.DailyRollingFileAppender
log4j.appender.A1.File=logs/file.log
log4j.appender.A1.DatePattern='.'yyyy-MM-dd
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} [%p] [%c:%L] - %m%n

大多数时候我定义了几个appender ...一个用于Console，另一些用于文件。但大多数时候我使用相同的布局输出。 有没有办法定义默认的？

那样的东西？

log4j.appender.layout=org.apache.log4j.PatternLayout
log4j.appender.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} [%p] [%c:%L] - %m%n

Answer 1

# Root logger option
log4j.rootLogger=ALL, stdout, A1
log4j.logger.org.apache.jsp=ALL, stdout, A1

PATTERN=%d{yyyy-MM-dd HH:mm:ss} [%p] %l - %m%n

# Direct log messages to stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=${PATTERN}

# LOG4J daily rolling log files configuration
log4j.appender.A1=org.apache.log4j.DailyRollingFileAppender
log4j.appender.A1.File=logs/file.log
log4j.appender.A1.DatePattern='.'yyyy-MM-dd
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=${PATTERN}

似乎这样做的唯一方法是设置变量，因为我已完成PATTERN=%d{yyyy-MM-dd HH:mm:ss} [%p] %l - %m%n