Spring Boot项目——log4j日志配置案例

背景

• 公司使用maven、Spring Boot搭建微服务项目，使用log4j输出日志
• Maven 3.5
• SPring Boot 2.2

项目配置

• 项目目录如下
  • 
• pom.xml配置(只显示和log4j有关的配置)

  • <dependency>
       <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-web</artifactId>
          <version>${spring-boot-starter.version}</version>
          <exclusions>
             <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-logging</artifactId>
             </exclusion>
          </exclusions>
    </dependency>
    
    <dependency>
       <groupId>io.github.lognet</groupId>
       <artifactId>grpc-spring-boot-starter</artifactId>
       <version>3.5.1</version>
       <exclusions>
          <exclusion>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-logging</artifactId>
          </exclusion>
       </exclusions>
    </dependency>
    <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-log4j</artifactId>
          <version>1.3.8.RELEASE</version>
    </dependency>

• log4j.properties

  • log4j.rootLogger=INFO,DEBUG,ERROR, stdout
    log4j.appender.stdout=org.apache.log4j.ConsoleAppender
    log4j.appender.stdout.Target=System.out
    log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
    log4j.appender.stdout.layout.ConversionPattern=%d{yy/MM/dd HH:mm:ss} %p %c{2}: %m%n
    
    #----------------------------文件存在项目根目录下-----------------------#
    #----------------------------------------------------------------------------------------------------
    #输出INFO级别以上的内容到info.log中
    log4j.logger.INFO=INFO
    log4j.appender.INFO = org.apache.log4j.DailyRollingFileAppender
    log4j.appender.INFO.File = logs/supersiver/objects/info.log
    log4j.appender.INFO.Threshold = INFO
    log4j.appender.INFO.Append = true
    log4j.appender.INFO.layout = org.apache.log4j.PatternLayout
    log4j.appender.INFO.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n
    #-----------------------------------------------------------------------------------------------------
    #输出DEBUG 级别以上的日志到debugger.log
    log4j.logger.DEBUG=DEBUG
    log4j.appender.DEBUG = org.apache.log4j.DailyRollingFileAppender
    log4j.appender.DEBUG.File = logs/supersiver/objects/debugger.log
    log4j.appender.DEBUG.Threshold = DEBUG
    log4j.appender.DEBUG.Append = true
    log4j.appender.DEBUG.layout = org.apache.log4j.PatternLayout
    log4j.appender.DEBUG.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n
    #-----------------------------------------------------------------------------------------------------
    #输出ERROR 级别以上的日志到error.log
    log4j.logger.ERROR=ERROR
    log4j.appender.ERROR = org.apache.log4j.DailyRollingFileAppender
    log4j.appender.ERROR.File =logs/supersiver/objects/error.log
    log4j.appender.ERROR.Threshold = ERROR 
    log4j.appender.ERROR.Append = true
    log4j.appender.ERROR.layout = org.apache.log4j.PatternLayout
    log4j.appender.ERROR.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

拓展

• Spring Boot本身就内置了日志功能，使用的是LogBack，所以我们想要使用log4j作为日志输出的话，需要在pom.xml中将Spring Boot内置的日志LogBack排除，否则很容易和log4j产生冲入，导致项目报错