log4j更新為log4j2（無需修改代碼）

1.Tomcat\webapps\app\WEB-INF\lib目錄下删除有關log4j的jar包

log4j-1.2.8.jar、slf4j-api-1.5.6.jar（版本有所不同，通過jar包開頭确定log4j jar包）

2.Tomcat\webapps\app\WEB-INF\lib目錄下添加log4j2相關jar包

log4j-api-2.13.0.jar、log4j-1.2-api-2.13.0.jar、log4j-core-2.13.0.jar

3.Tomcat\webapps\app\WEB-INF\classes目錄下删除log4j配置檔案

log4j.properties

4.Tomcat\webapps\app\WEB-INF\classes目錄下添加log4j2配置檔案

log4j.xml或者log4j2.properties

附上log4j2.properties配置

status = warn
name = MyApp

#指定輸出源‘類型’為控制台
appender.console.type = Console
appender.console.name = consoleLogDemo
appender.console.filter.threshold.type = ThresholdFilter
appender.console.filter.threshold.level = debug
appender.console.layout.type = PatternLayout
appender.console.layout.pattern = [%-5p] [%d{yyyy-MM-dd HH:mm:ss}] [%C{1}:%M:%L] %m%n
appender.console.target = System_out

appender.rolling.type = RollingFile
appender.rolling.name = fileLogDemo
appender.rolling.filter.threshold.type = ThresholdFilter
appender.rolling.filter.threshold.level = info
appender.rolling.layout.type = PatternLayout
appender.rolling.layout.pattern = [%-5p] [%d{yyyy-MM-dd HH:mm:ss}] [%C{1}:%M:%L] %m%n
appender.rolling.append = true
appender.rolling.fileName =/data/logs/workflow/web.log
appender.rolling.filePattern=/data/logs/wokflow/web.log.%d{yyyy-MM-dd}
appender.rolling.policies.type = Policies
appender.rolling.policies.time.type = TimeBasedTriggeringPolicy
appender.rolling.policies.time.interval = 2
appender.rolling.policies.time.modulate = true
appender.rolling.policies.size.type = SizeBasedTriggeringPolicy
appender.rolling.policies.size.size=100MB
appender.rolling.strategy.type = DefaultRolloverStrategy
appender.rolling.strategy.max = 5


logger.rolling.name = com.iqiyi
logger.rolling.level = info
logger.rolling.additivity = false
logger.rolling.appenderRef.rolling.ref = fileLogDemo

#指明根級日志的級别
rootLogger.level = info
#指定哪些appender輸出源是根級日志的輸出級别
rootLogger.appenderRef.consolelogdemo.ref = consoleLogDemo
rootLogger.appenderRef.filelogdemo.ref = fileLogDemo