SpringBoot日志框架

日志门面与具体实现

slf4j(http://www.slf4j.org/)、log4j、logback是同一个人开发的

log4j2是apache开发的,只是借了log4j的名字

springboot默认使用的是:slf4j+logback

其他框架统一使用slf4j

1.将其他框架的日志jar包排除掉

2.用中间包来替换原有的日志框架

3.然后导入slf4j和具体的实现jar包

springboot实现方式

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-logging</artifactId>
  <version>2.2.5.RELEASE</version>
  <scope>compile</scope>
</dependency>

模式使用上面的实现日志记录,同时spring-boot-starter-logging引入了如下的包

<dependencies>
  <dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-classic</artifactId>
    <version>1.2.3</version>
    <scope>compile</scope>
  </dependency>
  <dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-to-slf4j</artifactId>
    <version>2.12.1</version>
    <scope>compile</scope>
  </dependency>
  <dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>jul-to-slf4j</artifactId>
    <version>1.7.30</version>
    <scope>compile</scope>
  </dependency>
</dependencies>

默认使用的是logback,同时引入log4j和jul的转换jar包,使得使用log4j和jul的也是用slf4j来记录日志

假如要使用其他的日志框架,则要先排除spring-boot-starter-logging这个jar包,然后在引入其他日志框架的jar包。

logback配置文件

不同的日志框架对应的不同的配置文件名称

https://docs.spring.io/spring-boot/docs/current/reference/html/features.html#features.logging.custom-log-configuration

Logging SystemCustomization
Logbacklogback-spring.xml, logback-spring.groovy, logback.xml, or logback.groovy
Log4j2log4j2-spring.xml or log4j2.xml
JDK (Java Util Logging)logging.properties
# 推荐使用-spring.xml的文件,例如,优先使用logback-spring.xml而不是logback.xml
When possible, we recommend that you use the -spring variants for your logging configuration (for example, logback-spring.xml rather than logback.xml). If you use standard configuration locations, Spring cannot completely control log initialization.

logback.xml是日志框架自动加载的

logback-spring.xml文件是spring加载的

因此,使用标签允许根据配置文件选择性的包含或排除某些配置。使用该name属性指定哪个配置文件接受配置。

<springProfile name="staging">
    <!-- configuration to be enabled when the "staging" profile is active -->
</springProfile>

<springProfile name="dev | staging">
    <!-- configuration to be enabled when the "dev" or "staging" profiles are active -->
</springProfile>

<springProfile name="!production">
    <!-- configuration to be enabled when the "production" profile is not active -->
</springProfile>
<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
  <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
    <!--日志文件输出的文件名 -->
    <!--dev环境是用下面 -->
    <springProfile name="dev">
    	<FileNamePattern>${LOG_HOME}/upmsApi-dev-%d{yyyy-MM-dd}.%i.log</FileNamePattern>
    </springProfile>
    <!--非dev环境是用下面 -->
    <springProfile name="!dev">
    	<FileNamePattern>${LOG_HOME}/upmsApi-%d{yyyy-MM-dd}.%i.log</FileNamePattern>
    </springProfile>
    <!--日志文件保留天数 -->
    <MaxHistory>30</MaxHistory>
    <maxFileSize>10MB</maxFileSize>
  </rollingPolicy>
</appender>

切换日志框架

1.springboot默认使用的是slf4j+logback,现在切换为slf4j+log4j

<!-- 排除logback和log4j的转换包(因为就是用log4j了,就不用转换了) -->
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-web</artifactId>
  <exclusions>
  	<exclusion>
      <groupid>ch.qos.logback</groupid>
      <artifactid>logback-classic<atifactid>   
    </exclusion>
    <exclusion>
      <groupid>org.sif4j</groupid>
      <artifactid>1og4j-over-s1f4j<artifactid>   
    </exclusion>
  </exclusions>
</dependency>
<!-- slf4j-1og4j12依赖log4j,所以不用单独引入log4j -->
<dependency>
	<groupid>org.s1f4j<groupid>
  <artifactid>slf4j-1og4j12</artifactid>  
</dependency>

引入log4j的配置文件

2.切换为slf4j+log4j2

<!-- 排除logback和log4j的转换包(因为就是用log4j了,就不用转换了) -->
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-web</artifactId>
  <exclusions>
  	<exclusion>
      <groupid>org.springframework.boot</groupid>
      <artifactid>spring-boot-starter-logging<atifactid>   
    </exclusion>
  </exclusions>
</dependency>
<!-- 引入 -->
<dependency>
	<groupid>org.springframework.boot<groupid>
  <artifactid>spring-boot-starter-log4j2</artifactid>
</dependency>

引入log4j2的配置文件

# Java   Spring  

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