SpringBoot 2.x Druid中整合上Log4j2

本文主要是在整合了druid的情况下整合log4j2，如果还没有整合druid的可以先参考我的另一篇文章：SpringBoot2.x 整合druid，并将数据库密码加密。

下面开始整合log4j2：

步骤一

在pom.xml中添加以下依赖：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
    <exclusions>
        <!--移除默认的logback-->
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-logging</artifactId>
        </exclusion>
    </exclusions>
</dependency>

<!--log4j2-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>

<!-- 加上这个才能辨认到log4j2.yml文件 -->
<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-yaml</artifactId>
</dependency>

步骤二

在resources目录下新建一个log4j2.yml文件：

#log4j2.yml
Configuration:
  status: OFF
  name: YAMLConfigTest
  properties:
    property:
      name: filename
      value: target/test-yaml.log
  thresholdFilter:
    level: debug
  appenders:
    #只接受程序中DEBUG级别的日志进行处理
    Console:
      name: Console
      target: SYSTEM_OUT
      ThresholdFilter:
        level: DEBUG
        onMatch: ACCEPT
        onMismatch: DENY
      PatternLayout:
        Pattern: "[%d{HH:mm:ss.SSS}] %-5level %class{36} %L %M - %msg%xEx%n"
    #处理DEBUG级别的日志，并把该日志放到logs/debug.log文件中
    RollingFile:
    #打印出DEBUG级别日志，每次大小超过size，则这size大小的日志会自动存入按年份-月份建立的文件夹下面并进行压缩，作为存档
    - name: RollingFileDebug
      fileName: ./logs/bulb/debug.log
      filePattern: "logs/$${date:yyyy-MM}/debug-%d{yyyy-MM-dd}-%i.log.gz"
      PatternLayout:
        Pattern: "[%d{yyyy-MM-dd HH:mm:ss}] %-5level %class{36} %L %M - %msg%xEx%n"
      Filters:
        ThresholdFilter:
        - level: DEBUG
        - level: INFO
          onMatch: DENY
          onMismatch: NEUTRAL
      Policies:
        SizeBasedTriggeringPolicy:
          size: 512MB
    #处理INFO级别的日志，并把该日志放到tomcat根目录/bin/logs/info.log文件中
    - name: RollingFileInfo
      fileName: ./logs/bulb/info.log
      filePattern: "logs/$${date:yyyy-MM}/info-%d{yyyy-MM-dd}-%i.log.gz"
      PatternLayout:
        Pattern: "[%d{yyyy-MM-dd HH:mm:ss}] %-5level %class{36} %L %M - %msg%xEx%n"
      Filters:
        #只接受INFO级别的日志，其余的全部拒绝处理
        ThresholdFilter:
        - level: INFO
        - level: WARN
          onMatch: DENY
          onMismatch: NEUTRAL
      Policies:
        SizeBasedTriggeringPolicy:
          size: 512MB
    #处理WARN级别的日志，并把该日志放到logs/warn.log文件中
    - name: RollingFileWarn
      fileName: ./logs/bulb/warn.log
      filePattern: "logs/$${date:yyyy-MM}/warn-%d{yyyy-MM-dd}-%i.log.gz"
      PatternLayout:
        Pattern: "[%d{yyyy-MM-dd HH:mm:ss}] %-5level %class{36} %L %M - %msg%xEx%n"
      Filters:
        ThresholdFilter:
        - level: WARN
        - level: ERROR
          onMatch: DENY
          onMismatch: NEUTRAL
      Policies:
        SizeBasedTriggeringPolicy:
          size: 512MB
    #处理error级别的日志，并把该日志放到logs/error.log文件中
    - name: RollingFileError
      fileName: ./logs/bulb/error.log
      filePattern: "logs/$${date:yyyy-MM}/error-%d{yyyy-MM-dd}-%i.log.gz"
      PatternLayout:
        Pattern: "[%d{yyyy-MM-dd HH:mm:ss}] %-5level %class{36} %L %M - %msg%xEx%n"
      ThresholdFilter:
        level: ERROR
      Policies:
        SizeBasedTriggeringPolicy:
          size: 512MB
    #druid的日志记录追加器
    - name: druidSqlRollingFile
      fileName: ./logs/bulb/druid-sql.log
      filePattern: "logs/$${date:yyyy-MM}/api-%d{yyyy-MM-dd}-%i.log.gz"
      PatternLayout:
        Pattern: "[%d{yyyy-MM-dd HH:mm:ss}] %-5level %L %M - %msg%xEx%n"
      Policies:
        SizeBasedTriggeringPolicy:
          size: 512MB
  loggers:
    logger:
      #记录druid-sql的记录
      name: druid.sql.Statement
      level: debug
      additivity: false
      appender-ref:
        ref: druidSqlRollingFile
    #log4j2 自带过滤日志
    Logger:
    - name: org.apache.catalina.startup.DigesterFactory
      level: error
    - name: org.apache.catalina.util.LifecycleBase
      level: error
    - name: org.apache.coyote.http11.Http11NioProtocol
      level: warn
    - name: org.apache.sshd.common.util.SecurityUtils
      level: warn
    - name: org.apache.tomcat.util.net.NioSelectorPool
      level: warn
    - name: org.crsh.plugin
      level: warn
    - name: org.crsh.ssh
      level: warn
    - name: org.eclipse.jetty.util.component.AbstractLifeCycle
      level: error
    - name: org.hibernate.validator.internal.util.Version
      level: warn
    - name: org.springframework.boot.actuate.autoconfigure.CrshAutoConfiguration
      level: warn
    - name: org.springframework.boot.actuate.endpoint.jmx
      level: warn
    - name: org.thymeleaf
      level: warn
    root:
      level: DEBUG
      appender-ref:
      - ref: Console
      - ref: RollingFileInfo
      - ref: RollingFileWarn
      - ref: RollingFileError
      - ref: RollingFileDebug

步骤三

在application.yml中添加：

spring:
    druid:
      #开启log4j2
      log4j2:
        enabled: true
logging:
  config: classpath:log4j2.yml

这样就整合完成了，按照我的这个yml文件运行后log文件在tomcat根目录/bin/logs/bulb目录下。