logback 日志级别不可控问题解决

1、问题

在使用slf4j+log4j时,发现输出的日志总是在DEBUG级别,而且格式非logback.xml中给出的格式。

logback.xml内容如下:



	
	

	
		
			HERE %d{HH:mm:ss.SSS} [%thread] %-5level %C{36} %L - %msg%n 
		
	


	UTF-8

	
	
		   	
	

输出结果(部分截取):

信息: Initializing Spring root WebApplicationContext
14:20:53.084 [localhost-startStop-1] INFO org.springframework.web.context.ContextLoader - Root WebApplicationContext: initialization started
14:20:53.136 [localhost-startStop-1] DEBUG org.springframework.core.io.support.PathMatchingResourcePatternResolver - Found Equinox FileLocator for OSGi bundle URL resolution
14:20:53.206 [localhost-startStop-1] DEBUG org.springframework.web.context.support.StandardServletEnvironment - Adding [servletConfigInitParams] PropertySource with lowest search precedence
14:20:53.206 [localhost-startStop-1] DEBUG org.springframework.web.context.support.StandardServletEnvironment - Adding [servletContextInitParams] PropertySource with lowest search precedence
14:20:53.212 [localhost-startStop-1] DEBUG org.springframework.web.context.support.StandardServletEnvironment - Adding [jndiProperties] PropertySource with lowest search precedence
14:20:53.213 [localhost-startStop-1] DEBUG org.springframework.web.context.support.StandardServletEnvironment - Adding [systemProperties] PropertySource with lowest search precedence
14:20:53.217 [localhost-startStop-1] DEBUG org.springframework.web.context.support.StandardServletEnvironment - Adding [systemEnvironment] PropertySource with lowest search precedence
14:20:53.217 [localhost-startStop-1] DEBUG org.springframework.web.context.support.StandardServletEnvironment - Initialized StandardServletEnvironment with PropertySources [servletConfigInitParams,servletContextInitParams,jndiProperties,systemProperties,systemEnvironment]
14:20:53.227 [localhost-startStop-1] DEBUG org.springframework.web.context.support.StandardServletEnvironment - Replacing [servletContextInitParams] PropertySource with [servletContextInitParams]
14:20:53.228 [localhost-startStop-1] INFO org.springframework.web.context.support.XmlWebApplicationContext - Refreshing Root WebApplicationContext: startup date [Fri Jul 29 14:20:53 CST 2016]; root of context hierarchy
14:20:53.300 [localhost-startStop-1] DEBUG org.springframework.core.env.StandardEnvironment - Adding [systemProperties] PropertySource with lowest search precedence
14:20:53.300 [localhost-startStop-1] DEBUG org.springframework.core.env.StandardEnvironment - Adding [systemEnvironment] PropertySource with lowest search precedence
14:20:53.301 [localhost-startStop-1] DEBUG org.springframework.core.env.StandardEnvironment - Initialized StandardEnvironment with PropertySources [systemProperties,systemEnvironment]
14:20:53.317 [localhost-startStop-1] INFO org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loading XML bean definitions from ServletContext resource [/WEB-INF/dispatch-servlet.xml]
14:20:53.320 [localhost-startStop-1] DEBUG org.springframework.beans.factory.xml.DefaultDocumentLoader - Using JAXP provider [com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl]
14:20:53.354 [localhost-startStop-1] DEBUG org.springframework.beans.factory.xml.PluggableSchemaResolver - Loading schema mappings from [META-INF/spring.schemas]
14:20:53.360 [localhost-startStop-1] DEBUG org.springframework.beans.factory.xml.PluggableSchemaResolver - Loaded schema mappings: {http://www.springframework.org/schema/tx/spring-tx-2.5.xsd=org/springframework/transaction/config/spring-tx-2.5.xsd, http://www.springframework.org/schema/aop/spring-aop-4.1.xsd=org/springframework/aop/config/spring-aop-4.1.xsd, http://www.springframework.org/schema/context/spring-context-3.1.xsd=org/springframework/context/config/spring-context-3.1.xsd, http://www.springframework.org/schema/jdbc/spring-jdbc-4.1.xsd=org/springframework/jdbc/config/spring-jdbc-4.1.xsd, http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd=org/springframework/web/servlet/config/spring-mvc-4.1.xsd, http://www.springframework.org/schema/util/spring-util-3.0.xsd=org/springframework/beans/factory/xml/spring-util-3.0.xsd, http://www.springframework.org/schema/security/spring-security-3.0.3.xsd=org/springframework/security/config/spring-security-3.0.3.xsd, http://www.springframework.org/schema/security/spring-security-2.0.1.xsd=org/springframework/security/config/spring-security-2.0.1.xsd, http://www.springframework.org/schema/tool/spring-tool.xsd=org/springframework/beans/factory/xml/spring-tool-4.1.xsd, http://www.springframework.org/schema/aop/spring-aop-3.2.xsd=org/springframework/aop/config/spring-aop-3.2.xsd, http://www.springframework.org/schema/lang/spring-lang-4.1.xsd=org/springframework/scripting/config/spring-lang-4.1.xsd, http://www.springframework.org/schema/context/spring-context-4.0.xsd=org/springframework/context/config/spring-context-4.0.xsd, http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd=org/springframework/web/servlet/config/spring-mvc-3.2.xsd, http://www.springframework.org/schema/tool/spring-tool-4.1.xsd=org/springframework/beans/factory/xml/spring-tool-4.1.xsd, http://www.springframework.org/schema/lang/spring-lang-3.2.xsd=org/springframework/scripting/config/spring-lang-3.2.xsd, http://www.springframework.org/schema/cache/spring-cache-3.2.xsd=org/springframework/cache/config/spring-cache-3.2.xsd, http://www.springframework.org/schema/jee/spring-jee-4.1.xsd=org/springframework/ejb/config/spring-jee-4.1.xsd, http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd=org/springframework/jdbc/config/spring-jdbc-3.1.xsd, http://www.springframework.org/schema/util/spring-util-2.0.xsd=org/springframework/beans/factory/xml/spring-util-2.0.xsd, http://www.springframework.org/schema/tool/spring-tool-3.2.xsd=org/springframework/beans/factory/xml/spring-tool-3.2.xsd, http://www.springframework.org/schema/context/spring-context.xsd=org/springframework/context/config/spring-context-4.1.xsd, http://www.springframework.org/schema/cache/spring-cache-4.1.xsd=org/springframework/cache/config/spring-cache-4.1.xsd, http://www.springframework.org/schema/aop/spring-aop-4.0.xsd=org/springframework/aop/config/spring-aop-4.0.xsd, http://www.springframework.org/schema/security/spring-security-2.0.xsd=org/springframework/security/config/spring-security-2.0.xsd, http://www.springframework.org/schema/jee/spring-jee-3.2.xsd=org/springframework/ejb/config/spring-jee-3.2.xsd, http://www.springframework.org/schema/context/spring-context-3.0.xsd=org/springframework/context/config/spring-context-3.0.xsd, http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd=org/springframework/jdbc/config/spring-jdbc-4.0.xsd, http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd=org/springframework/web/servlet/config/spring-mvc-4.0.xsd, http://www.springframework.org/schema/util/spring-util-2.5.xsd=org/springframework/beans/factory/xml/spring-util-2.5.xsd, http://www.springframework.org/schema/beans/spring-beans-3.2.xsd=org/springframework/beans/factory/xml/spring-beans-3.2.xsd, http://www.springframework.org/schema/aop/spring-aop-3.1.xsd=org/springframework/aop/config/spring-aop-3.1.xsd, http://www.springframework.org/schema/lang/spring-lang-4.0.xsd=org/springframework/scripting/config/spring-lang-4.0.xsd, http://www.springframework.org/schema/mvc/spring-mvc.xsd=org/springframework/web/servlet/config/spring-mvc-4.1.xsd, http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd=org/springframework/web/servlet/config/spring-mvc-3.1.xsd, http://www.springframework.org/schema/beans/spring-beans-4.1.xsd=org/springframework/beans/factory/xml/spring-beans-4.1.xsd, http://www.springframework.org/schema/tool/spring-tool-4.0.xsd=org/springframework/beans/factory/xml/spring-tool-4.0.xsd, http://www.springframework.org/schema/tx/spring-tx-3.2.xsd=org/springframework/transaction/config/spring-tx-3.2.xsd, http://www.springframework.org/schema/lang/spring-lang-3.1.xsd=org/springframework/scripting/config/spring-lang-3.1.xsd, http://www.springframework.org/schema/cache/spring-cache-3.1.xsd=org/springframework/cache/config/spring-cache-3.1.xsd, http://www.springframework.org/schema/jee/spring-jee-4.0.xsd=org/springframework/ejb/config/spring-jee-4.0.xsd, http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd=org/springframework/jdbc/config/spring-jdbc-3.0.xsd, http://www.springframework.org/schema/task/spring-task-4.1.xsd=org/springframework/scheduling/config/spring-task-4.1.xsd, http://www.springframework.org/schema/jdbc/spring-jdbc.xsd=org/springframework/jdbc/config/spring-jdbc-4.1.xsd, http://www.springframework.org/schema/tool/spring-tool-3.1.xsd=org/springframework/beans/factory/xml/spring-tool-3.1.xsd, http://www.springframework.org/schema/tx/spring-tx-4.1.xsd=org/springframework/transaction/config/spring-tx-4.1.xsd, http://www.springframework.org/schema/cache/spring-cache-4.0.xsd=org/springframework/cache/config/spring-cache-4.0.xsd, http://www.springframework.org/schema/jee/spring-jee-3.1.xsd=org/springframework/ejb/config/spring-jee-3.1.xsd, http://www.springframework.org/schema/task/spring-task-3.2.xsd=org/springframework/scheduling/config/spring-task-3.2.xsd, http://www.springframework.org/schema/beans/spring-beans-3.1.xsd=org/springframework/beans/factory/xml/spring-beans-3.1.xsd, http://www.springframework.org/schema/util/spring-util.xsd=org/springframework/beans/factory/xml/spring-util-4.1.xsd, http://www.springframework.org/schema/aop/spring-aop-3.0.xsd=org/springframework/aop/config/spring-aop-3.0.xsd, http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd=org/springframework/web/servlet/config/spring-mvc-3.0.xsd, http://www.springframework.org/schema/beans/spring-beans-4.0.xsd=org/springframework/beans/factory/xml/spring-beans-4.0.xsd, http://www.springframework.org/schema/beans/spring-beans.xsd=org/springframework/beans/factory/xml/spring-beans-4.1.xsd, http://www.springframework.org/schema/security/spring-security-2.0.4.xsd=org/springframework/security/config/spring-security-2.0.4.xsd, http://www.springframework.org/schema/tx/spring-tx-3.1.xsd=org/springframework/transaction/config/spring-tx-3.1.xsd, http://www.springframework.org/schema/lang/spring-lang-3.0.xsd=org/springframework/scripting/config/spring-lang-3.0.xsd, http://www.springframework.org/schema/context/spring-context-2.5.xsd=org/springframework/context/config/spring-context-2.5.xsd, http://www.springframework.org/schema/task/spring-task-4.0.xsd=org/springframework/scheduling/config/spring-task-4.0.xsd, http://www.springframework.org/schema/tool/spring-tool-3.0.xsd=org/springframework/beans/factory/xml/spring-tool-3.0.xsd, http://www.springframework.org/schema/tx/spring-tx-4.0.xsd=org/springframework/transaction/config/spring-tx-4.0.xsd, http://www.springframework.org/schema/aop/spring-aop-2.0.xsd=org/springframework/aop/config/spring-aop-2.0.xsd, http://www.springframework.org/schema/security/spring-security-3.2.xsd=org/springframework/security/config/spring-security-3.2.xsd, http://www.springframework.org/schema/jee/spring-jee-3.0.xsd=org/springframework/ejb/config/spring-jee-3.0.xsd, http://www.springframework.org/schema/util/spring-util-4.1.xsd=org/springframework/beans/factory/xml/spring-util-4.1.xsd, http://www.springframework.org/schema/task/spring-task-3.1.xsd=org/springframework/scheduling/config/spring-task-3.1.xsd, http://www.springframework.org/schema/beans/spring-beans-3.0.xsd=org/springframework/beans/factory/xml/spring-beans-3.0.xsd, http://www.springframework.org/schema/jee/spring-jee.xsd=org/springframework/ejb/config/spring-jee-4.1.xsd, http://www.springframework.org/schema/aop/spring-aop-2.5.xsd=org/springframework/aop/config/spring-aop-2.5.xsd, http://www.springframework.org/schema/lang/spring-lang-2.0.xsd=org/springframework/scripting/config/spring-lang-2.0.xsd, http://www.springframework.org/schema/util/spring-util-3.2.xsd=org/springframework/beans/factory/xml/spring-util-3.2.xsd, http://www.springframework.org/schema/task/spring-task.xsd=org/springframework/scheduling/config/spring-task-4.1.xsd, http://www.springframework.org/schema/tool/spring-tool-2.0.xsd=org/springframework/beans/factory/xml/spring-tool-2.0.xsd, http://www.springframework.org/schema/tx/spring-tx-3.0.xsd=org/springframework/transaction/config/spring-tx-3.0.xsd, http://www.springframework.org/schema/lang/spring-lang-2.5.xsd=org/springframework/scripting/config/spring-lang-2.5.xsd, http://www.springframework.org/schema/jee/spring-jee-2.0.xsd=org/springframework/ejb/config/spring-jee-2.0.xsd, http://www.springframework.org/schema/tool/spring-tool-2.5.xsd=org/springframework/beans/factory/xml/spring-tool-2.5.xsd, http://www.springframework.org/schema/security/spring-security-3.1.xsd=org/springframework/security/config/spring-security-3.1.xsd, http://www.springframework.org/schema/jee/spring-jee-2.5.xsd=org/springframework/ejb/config/spring-jee-2.5.xsd, http://www.springframework.org/schema/util/spring-util-4.0.xsd=org/springframework/beans/factory/xml/spring-util-4.0.xsd, http://www.springframework.org/schema/task/spring-task-3.0.xsd=org/springframework/scheduling/config/spring-task-3.0.xsd, http://www.springframework.org/schema/lang/spring-lang.xsd=org/springframework/scripting/config/spring-lang-4.1.xsd, http://www.springframework.org/schema/context/spring-context-3.2.xsd=org/springframework/context/config/spring-context-3.2.xsd, http://www.springframework.org/schema/util/spring-util-3.1.xsd=org/springframework/beans/factory/xml/spring-util-3.1.xsd, http://www.springframework.org/schema/beans/spring-beans-2.0.xsd=org/springframework/beans/factory/xml/spring-beans-2.0.xsd, http://www.springframework.org/schema/cache/spring-cache.xsd=org/springframework/cache/config/spring-cache-4.1.xsd, http://www.springframework.org/schema/tx/spring-tx.xsd=org/springframework/transaction/config/spring-tx-4.1.xsd, http://www.springframework.org/schema/security/spring-security-2.0.2.xsd=org/springframework/security/config/spring-security-2.0.2.xsd, http://www.springframework.org/schema/context/spring-context-4.1.xsd=org/springframework/context/config/spring-context-4.1.xsd, http://www.springframework.org/schema/beans/spring-beans-2.5.xsd=org/springframework/beans/factory/xml/spring-beans-2.5.xsd, http://www.springframework.org/schema/tx/spring-tx-2.0.xsd=org/springframework/transaction/config/spring-tx-2.0.xsd, http://www.springframework.org/schema/security/spring-security.xsd=org/springframework/security/config/spring-security-3.2.xsd, http://www.alibaba.com/schema/stat.xsd=META-INF/stat.xsd, http://www.springframework.org/schema/security/spring-security-3.0.xsd=org/springframework/security/config/spring-security-3.0.xsd, http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd=org/springframework/jdbc/config/spring-jdbc-3.2.xsd, http://www.springframework.org/schema/aop/spring-aop.xsd=org/springframework/aop/config/spring-aop-4.1.xsd}
1

从日志输出结果可以看到:即便在logback.xml配置文件中设置了输入级别为info,却仍然有DEBUG级别的日志输出,而且,日志应以“HERE”前缀开头,因为输出格式中有配置:

HERE %d{HH:mm:ss.SSS} [%thread] %-5level %C{36} %L - %msg%n 
但结果却没有HERE字样的日志输出,这说明logback.xml并未生效,系统使用的是其他的配置文件或缺省的配置(缺省配置级别为DEBUG)。

2、分析

通过反复的测试,发现竟然是类的加载先后顺序问题。在web.xml中配置了logback.xml加载的文件即加载方式(监听器),见下面的文件:



  Archetype Created Web Application

  
    webAppRootKey
    Workflow
  
  
  
    contextConfigLocation
    /WEB-INF/dispatch-servlet.xml,/WEB-INF/conf/spring/*.xml,classpath*:META-INF/conf/spring/*.xml
  
  
  
    logbackConfigLocation
    /WEB-INF/conf/logback.xml
  


  
    org.springframework.web.context.ContextLoaderListener
     

  
    ch.qos.logback.ext.spring.web.LogbackConfigListener
    
 


  
    dispatch
    org.springframework.web.servlet.DispatcherServlet
    1
  
  
    dispatch
    /api/*
  

spring 启动的监听器(org.springframework.web.context.ContextLoaderListener) 在logback日志配置监听器(ch.qos.logback.ext.spring.web.LogbackConfigListener)之前加载,这时日志配置尚未加载,SPRING容器已启动,采用缺省的logback配置,随后即便logback日志加载成功,logback级别已经为DEBUG,且不能再改回来。

3、解决办法

解决的办法竟然很简单,那就是将spring 启动的监听器(org.springframework.web.context.ContextLoaderListener)和logback日志配置监听器(ch.qos.logback.ext.spring.web.LogbackConfigListener)掉过个,正确的配置顺序为:

(1)ch.qos.logback.ext.spring.web.LogbackConfigListener

(2)org.springframework.web.context.ContextLoaderListener

修改后的web.xml为:



  Archetype Created Web Application

  
    webAppRootKey
    Workflow
  
  
  
    contextConfigLocation
    /WEB-INF/dispatch-servlet.xml,/WEB-INF/conf/spring/*.xml,classpath*:META-INF/conf/spring/*.xml
  
  
  
    logbackConfigLocation
    /WEB-INF/conf/logback.xml
  

  
    ch.qos.logback.ext.spring.web.LogbackConfigListener
   

  
    org.springframework.web.context.ContextLoaderListener
     

  
    dispatch
    org.springframework.web.servlet.DispatcherServlet
    1
  
  
    dispatch
    /api/*
  

正常输出样例:

HERE 14:48:33.510 [localhost-startStop-1] INFO  o.s.web.context.ContextLoader 285 - Root WebApplicationContext: initialization started
HERE 14:48:33.643 [localhost-startStop-1] INFO  o.s.c.s.AbstractApplicationContext 510 - Refreshing Root WebApplicationContext: startup date [Fri Jul 29 14:48:33 CST 2016]; root of context hierarchy
HERE 14:48:33.720 [localhost-startStop-1] INFO  o.s.b.f.xml.XmlBeanDefinitionReader 317 - Loading XML bean definitions from ServletContext resource [/WEB-INF/dispatch-servlet.xml]
HERE 14:48:36.290 [localhost-startStop-1] INFO  o.s.b.f.xml.XmlBeanDefinitionReader 317 - Loading XML bean definitions from ServletContext resource [/WEB-INF/conf/spring/px-hessian-client.xml]
HERE 14:48:36.327 [localhost-startStop-1] INFO  o.s.b.f.xml.XmlBeanDefinitionReader 317 - Loading XML bean definitions from ServletContext resource [/WEB-INF/conf/spring/px-common.xml]
HERE 14:48:37.545 [localhost-startStop-1] INFO  o.s.b.f.s.DefaultListableBeanFactory 822 - Overriding bean definition for bean 'beanFactory': replacing [Generic bean: class [com.nariit.pi6000.framework.platform.PXBeanFactory]; scope=; abstract=false; lazyInit=false; autowireMode=1; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null; defined in ServletContext resource [/WEB-INF/dispatch-servlet.xml]] with [Generic bean: class [com.nariit.pi6000.framework.platform.PXBeanFactory]; scope=; abstract=false; lazyInit=false; autowireMode=1; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null; defined in ServletContext resource [/WEB-INF/conf/spring/px-common.xml]]
HERE 14:48:37.548 [localhost-startStop-1] INFO  o.s.b.f.xml.XmlBeanDefinitionReader 317 - Loading XML bean definitions from ServletContext resource [/WEB-INF/conf/spring/px-ds.xml]
HERE 14:48:37.599 [localhost-startStop-1] INFO  o.s.b.f.xml.XmlBeanDefinitionReader 317 - Loading XML bean definitions from ServletContext resource [/WEB-INF/conf/spring/px-bpm.xml]
HERE 14:48:37.972 [localhost-startStop-1] INFO  o.s.c.i.s.PropertiesLoaderSupport 172 - Loading properties file from ServletContext resource [/WEB-INF/conf/jdbc.properties]
HERE 14:48:37.973 [localhost-startStop-1] INFO  o.s.c.i.s.PropertiesLoaderSupport 172 - Loading properties file from ServletContext resource [/WEB-INF/conf/props/platform.properties]

正常输出没有DEBUG级别的日志输出,而且输出日志中带有“HERE ”前缀,与预设logback.xml配置一致。

4、注意事项

slf4j+logback需要用到的包:

slf4j1个包:

(1)slf4j-api-1.7.6.jar(必选)

下载地址:http://www.slf4j.org/download.html

Spring slf4j 1个包:

(1)logback-ext-spring-0.1.2.jar(必选)

二进制包下载地址:http://maven.outofmemory.cn/org.logback-extensions/logback-ext-spring/0.1.2/

源码:https://github.com/qos-ch/logback-extensions

loback3个包:

(2)logback-core-1.1.7.jar(必选)

(3)logback-classic-1.1.7.jar(必选)

(4)logback-access-1.1.7.jar(可选)

下载地址:http://logback.qos.ch/download.html


附:

输出格式参考:http://logback.qos.ch/manual/layouts.html

简要参考:


转换符 作用
c {length } 
lo {length } 
logger {length } 
输出日志的logger名,可有一个整形参数,功能是缩短logger名,设置为0表示只输入logger最右边点符号之后的字符串。
Conversion specifier Logger name Result
%logger mainPackage.sub.sample.Bar mainPackage.sub.sample.Bar
%logger{0} mainPackage.sub.sample.Bar Bar
%logger{5} mainPackage.sub.sample.Bar m.s.s.Bar
%logger{10} mainPackage.sub.sample.Bar m.s.s.Bar
%logger{15} mainPackage.sub.sample.Bar m.s.sample.Bar
%logger{16} mainPackage.sub.sample.Bar m.sub.sample.Bar
%logger{26} mainPackage.sub.sample.Bar mainPackage.sub.sample.Bar

 

C {length } 
class {length } 
输出执行记录请求的调用者的全限定名。参数与上面的一样。尽量避免使用,除非执行速度不造成任何问题。
contextName 
cn 
输出上下文名称。
d {pattern } 
date {pattern } 
输出日志的打印日志,模式语法与java.text.SimpleDateFormat 兼容。
Conversion Pattern Result
%d 2006-10-20 14:06:49,812
%date 2006-10-20 14:06:49,812
%date{ISO8601} 2006-10-20 14:06:49,812
%date{HH:mm:ss.SSS} 14:06:49.812
%date{dd MMM yyyy ;HH:mm:ss.SSS} 20 oct. 2006;14:06:49.812
F / file 输出执行记录请求的java源文件名。尽量避免使用,除非执行速度不造成任何问题。
caller{depth}caller{depth, evaluator-1, ... evaluator-n} 输出生成日志的调用者的位置信息,整数选项表示输出信息深度。

例如, %caller{2}   输出为:

0    [main] DEBUG - logging statement 
Caller+0   at mainPackage.sub.sample.Bar.sampleMethodName(Bar.java:22)
Caller+1   at mainPackage.sub.sample.Bar.createLoggingRequest(Bar.java:17)

例如, %caller{3}   输出为:

16   [main] DEBUG - logging statement 
Caller+0   at mainPackage.sub.sample.Bar.sampleMethodName(Bar.java:22)
Caller+1   at mainPackage.sub.sample.Bar.createLoggingRequest(Bar.java:17)
Caller+2   at mainPackage.ConfigTester.main(ConfigTester.java:38)
L / line 输出执行日志请求的行号。尽量避免使用,除非执行速度不造成任何问题。
m / msg / message

输出应用程序提供的信息。

M / method 输出执行日志请求的方法名。尽量避免使用,除非执行速度不造成任何问题。
n 输出平台先关的分行符“\n”或者“\r\n”。
p / le / level 输出日志级别。
r / relative 输出从程序启动到创建日志记录的时间,单位是毫秒
t / thread 输出产生日志的线程名。
replace(p ){r, t}

p 为日志内容,r 是正则表达式,将p 中符合r 的内容替换为t 。

例如, "%replace(%msg){'\s', ''}"



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