Tomcat 中使用Log4j 作为服务器的日志输出

Tomcat 默认使用java.util.logging 作为日志输出，在出现异常时有可能没有很好的输出异常信息，导致不容易跟踪问题。因此在某些情况下可以修改为使用 Log4j 作为日志输出

1. 创建一个log4j.properties文件放在 Tomcat 的 lib 目录中

   log4j.properties

   log4j.rootLogger = INFO, CATALINA, CONSOLE
   # Define all the appenders
   log4j.appender.CATALINA = org.apache.log4j.DailyRollingFileAppender
   log4j.appender.CATALINA.File = ${catalina.base}/logs/catalina
   log4j.appender.CATALINA.Append = true
   log4j.appender.CATALINA.Encoding = UTF-8
   # Roll-over the log once per day
   log4j.appender.CATALINA.DatePattern = '.'yyyy-MM-dd'.log'
   log4j.appender.CATALINA.layout = org.apache.log4j.PatternLayout
   log4j.appender.CATALINA.layout.ConversionPattern = %d [%t] %-5p %c- %m%n
   log4j.appender.LOCALHOST = org.apache.log4j.DailyRollingFileAppender
   log4j.appender.LOCALHOST.File = ${catalina.base}/logs/localhost
   log4j.appender.LOCALHOST.Append = true
   log4j.appender.LOCALHOST.Encoding = UTF-8
   log4j.appender.LOCALHOST.DatePattern = '.'yyyy-MM-dd'.log'
   log4j.appender.LOCALHOST.layout = org.apache.log4j.PatternLayout
   log4j.appender.LOCALHOST.layout.ConversionPattern = %d [%t] %-5p %c- %m%n
   log4j.appender.MANAGER = org.apache.log4j.DailyRollingFileAppender
   log4j.appender.MANAGER.File = ${catalina.base}/logs/manager
   log4j.appender.MANAGER.Append = true
   log4j.appender.MANAGER.Encoding = UTF-8
   log4j.appender.MANAGER.DatePattern = '.'yyyy-MM-dd'.log'
   log4j.appender.MANAGER.layout = org.apache.log4j.PatternLayout
   log4j.appender.MANAGER.layout.ConversionPattern = %d [%t] %-5p %c- %m%n
   log4j.appender.HOST-MANAGER = org.apache.log4j.DailyRollingFileAppender
   log4j.appender.HOST-MANAGER.File = ${catalina.base}/logs/host-manager
   log4j.appender.HOST-MANAGER.Append = true
   log4j.appender.HOST-MANAGER.Encoding = UTF-8
   log4j.appender.HOST-MANAGER.DatePattern = '.'yyyy-MM-dd'.log'
   log4j.appender.HOST-MANAGER.layout = org.apache.log4j.PatternLayout
   log4j.appender.HOST-MANAGER.layout.ConversionPattern = %d [%t] %-5p %c- %m%n
   log4j.appender.CONSOLE = org.apache.log4j.ConsoleAppender
   log4j.appender.CONSOLE.Encoding = UTF-8
   log4j.appender.CONSOLE.layout = org.apache.log4j.PatternLayout
   log4j.appender.CONSOLE.layout.ConversionPattern = %d [%t] %-5p %c- %m%n
   # Configure which loggers log to which appenders
   log4j.logger.org.apache.catalina.core.ContainerBase.[Catalina].[localhost] = INFO, LOCALHOST
   log4j.logger.org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/manager] =\
     INFO, MANAGER
   log4j.logger.org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/host-manager] =\
     INFO, HOST-MANAGER

2. 下载 tomcat-juli-adapters.jar 和 smartbi.war/WEB-INF/lib/log4j-1.2.13.jar 到 Tomcat 的 lib 目录
3. 下载 tomcat-juli.jar 到 Tomcat 的 bin 目录，替换同名文件
4. 删除 Tomcat 中 conf 目录中的 logging.properties 文件
5. 重启 Tomcat