如何在SpringBoot将log4j替换为logback

SpringBoot项目中将log4j替换为logback

方法如下
1、去掉所有log4j的相关依赖，主要有：

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

以及

<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
</dependency>

2、SpringBoot项目中依赖包spring-boot-starter中已经包含spring-boot-starter-logging，该依赖包就是默认的logback日志框架，则不需额外引入。但是要看项目中有没有排除掉，如下，有的话删除掉或者注释掉就OK了

<exclusions>
    <exclusion>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-logging</artifactId>
    </exclusion>
</exclusions>

以下是非springboot项目则需要添加以下依赖

<!-- logback日志配置开始 -->
<dependency>
 <groupId>ch.qos.logback</groupId>
 <artifactId>logback-core</artifactId>
</dependency>
<dependency>
 <groupId>ch.qos.logback</groupId>
 <artifactId>logback-access</artifactId>
</dependency>
<dependency>
 <groupId>ch.qos.logback</groupId>
 <artifactId>logback-classic</artifactId>
</dependency>
<dependency>
 <groupId>org.slf4j</groupId>
 <artifactId>log4j-over-slf4j</artifactId>
</dependency>
<!-- logback日志配置结束 -->

3、删除项目下/src/main/resources目录下的log4j.properties，并在该目录添加logback.xml文件，logback.xml文件如下：

<?xml version="1.0" encoding="UTF-8" ?>
<configuration scan="true" scanPeriod="30 seconds">
    <property name="logBase" value="./logs"/>
    <property name="log.archive.max.file.size" value="60MB"/>
    <property name="log.archive.max.history" value="15"/>
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>
            <!-- %highlight(%-5level)日志级别高亮显示 -->
                %date [%thread] %highlight(%-5level) %logger{10} [%file:%line] %msg%n
            </pattern>
            <charset>UTF-8</charset>
        </encoder>
    </appender>

    <!-- 服务日志 -->
    <appender name="GW_ROOT_LOG"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${logBase}/${serviceName}_ROOT.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            <!-- rollover daily -->
            <fileNamePattern>${logBase}/${serviceName}_ROOT-%d{yyyy-MM-dd}.%i.log
            </fileNamePattern>
            <maxHistory>${log.archive.max.history}</maxHistory>
            <maxFileSize>${log.archive.max.file.size}</maxFileSize>
        </rollingPolicy>
        <encoder>
            <pattern>%date [%thread] [%X{requestId}] %highlight(%-5level) %logger{10} [%file:%line] %msg%n</pattern>
            <charset>UTF-8</charset>
        </encoder>
    </appender>

    <root level="INFO">
        <appender-ref ref="CONSOLE"/>
        <appender-ref ref="FILE"/>
    </root>
</configuration>

4、最后在application.yml中替换logging的指向地址

logging:
  config: classpath:logback.xml