Log4j日志文件常用配置

1日志级别热修改web.xml===============================================================================<listener><listener-class>org.springframework.web.util.Log4jConfigListener</listener-class></listener><context-param> <param-name>log4jRefreshInterval</param-name> <param-value>5000</param-value></context-param>===============================================================================Spring的Log4jConfiglistener类会调用Log4j的PropertyConfigurator.configureAndWatch（），将刷新间隔作为参数传入。 public static void initLogging（String location, long refreshInterval） throws FileNotFoundException { String resolvedLocation =SystemPropertyUtils.resolvePlaceholders（location）; File file = ResourceUtils.getFile（resolvedLocation）; if （！file.exists（）） { throw new FileNotFoundException（"Log4j config file [" +resolvedLocation + "] not found"）; } if（resolvedLocation.toLowerCase（）.endsWith（XML_FILE_EXTENSION）） { DOMConfigurator.configureAndWatch（file.getAbsolutePath（）,refreshInterval）; } else { PropertyConfigurator.configureAndWatch（file.getAbsolutePath（）,refreshInterval）; } } 2日志文件编码格式<appender name="FILEOUT" class="org.apache.log4j.DailyRollingFileAppender"> <param name="File" value="${vc.log.path}/cdai_ssh.log" /> <param name="Encoding" value="UTF-8" /> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="[CDAI_SSH]%d{yyy-MM-dd HH:mm:ss}%-5p%m%n" /> </layout> <filter class="org.apache.log4j.varia.LevelRangeFilter"> <param name="LevelMin" value="DEBUG" /> <param name="LevelMax" value="DEBUG" /> </filter> </appender>3日志文件保留时间通过下面配置，可以限制DailyRollingFileAppender保留的文件个数。 <param name="MaxBackupIndex"value="10"/>