log4j配置模板:
log4j.properties:
log4j.rootLogger=info,CONSOLE,RFILE,FILE,DB 设置级别和三个输出端 log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender log4j.appender.CONSOLE.Target=System.out 控制台类型 log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout log4j.appender.CONSOLE.layout.ConversionPattern= %4p [%t] (%F:%L) - %m%n log4j.appender.FILE=org.apache.log4j.FileAppender log4j.appender.FILE.File=/help/my.properties 目标文件 log4j.appender.FILE.Append=false 是否追加 log4j.appender.FILE.layout=org.apache.log4j.PatternLayout 布局模式 log4j.appender.FILE.layout.ConversionPattern=%d{yyyy-MM-dd hh:mm:ss}:%p %c:%L - %m%n 格式化布局 log4j.appender.RFILE=org.apache.log4j.RollingFileAppender log4j.appender.RFILE.File=/help/my.properties 目标文件 log4j.appender.RFILE.MaxFileSize=1KB 最大长度 log4j.appender.RFILE.MaxBackupIndex=3 最多备份 log4j.appender.RFILE.layout=org.apache.log4j.PatternLayout 布局模式 log4j.appender.RFILE.layout.ConversionPattern=%d{yyyy-MM-dd hh:mm:ss}:%p %c:%L - %m%n 格式化布局 log4j.appender.DB=org.apache.log4j.jdbc.JDBCAppender log4j.appender.DB.URL=jdbc:oracle:thin:@127.0.0.1:1521:mumu URL log4j.appender.DB.driver=oracle.jdbc.driver.OracleDriver 驱动 log4j.appender.DB.user=liulibo 用户名 log4j.appender.DB.password=liulibo 密码 log4j.appender.DB.layout=org.apache.log4j.PatternLayout 布局模式 log4j.appender.DB.layout.ConversionPattern=insert into log4j(createdate,thread,level_,class,message) values(\'%d\',\'%t\',\'%-5p\',\'%c\',\'%m\') create table log4j(createdate varchar2(32),thread varchar2(32),level_ varchar2(32),class varchar2(32),message varchar2(32));
log4j.xml:
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration> <appender name="ConsoleAppender" class="org.apache.log4j.ConsoleAppender"> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{yyyy-MM-dd hh:mm:ss}:%p %t %c - %m%n"/> </layout> </appender> <appender name="RollingFileAppender" class="org.apache.log4j.RollingFileAppender"> <param name="Append" value="false"/> <param name="MaxFileSize" value="1KB"/> <param name="File" value="dom/my.log"/> <param name="MaxBackupIndex" value="3"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{yyyy-MM-dd hh:mm:ss}:%p %t %c - %m%n"/> </layout> </appender> <appender name="JDBCAppender" class="org.apache.log4j.jdbc.JDBCAppender"> <param name="URL" value="jdbc:oracle:thin:@127.0.0.1:1521:mumu"/> <param name="user" value="liulibo"/> <param name="password" value="liulibo"/> <param name="driver" value="oracle.jdbc.driver.OracleDriver"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="insert into log4j(createdate,thread,level_,class,message) values(\'%d\',\'%t\',\'%-5p\',\'%c\',\'%m\')"/> </layout> </appender> <root> <priority value ="debug" /> <appender-ref ref="ConsoleAppender"/> <appender-ref ref="RollingFileAppender"/> <appender-ref ref="JDBCAppender"/> </root> </log4j:configuration>
如果文件不完整总是会出现
log4j:ERROR No appender named [consoleAppender] could be found.
log4j:WARN No appenders could be found for logger (org.springframework.test.context.junit4.SpringJUnit4ClassRunner).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
这样的错误。
(1). 输出方式appender一般有5种:
org.apache.log4j.RollingFileAppender(滚动文件,自动记录最新日志)
org.apache.log4j.ConsoleAppender (控制台)
org.apache.log4j.FileAppender (文件)
org.apache.log4j.DailyRollingFileAppender (每天产生一个日志文件)
org.apache.log4j.WriterAppender (将日志信息以流格式发送到任意指定的地方)
(2). 日记记录的优先级priority,优先级由高到低分为
OFF ,FATAL ,ERROR ,WARN ,INFO ,DEBUG ,ALL。
Log4j建议只使用FATAL ,ERROR ,WARN ,INFO ,DEBUG这五个级别。
(3). 格式说明layout中的参数都以%开始,后面不同的参数代表不同的格式化信息(参数按字母表顺序列出):
%c 输出所属类的全名,可在修改为 %d{Num} ,Num类名输出的维(如:"org.apache.elathen.ClassName",%C{2}将输出elathen.ClassName)
%d 输出日志时间其格式为 %d{yyyy-MM-dd HH:mm:ss,SSS},可指定格式 如 %d{HH:mm:ss}
%l 输出日志事件发生位置,包括类目名、发生线程,在代码中的行数
%n 换行符
%m 输出代码指定信息,如info(“message”),输出message
%p 输出优先级,即 FATAL ,ERROR 等
%r 输出从启动到显示该log信息所耗费的毫秒数
%t 输出产生该日志事件的线程名
参考:http://www.blogjava.net/hello-yun/archive/2011/10/09/360283.html