springboot集成log4j日志

一、在springboot的pom.xml配置文件中引入依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <!--排除默认spring-boot-starter-logging启动器-->
            <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-log4j2</artifactId>
            <version>1.3.8.RELEASE</version>
        </dependency>
      </dependencies>

二、在项目目录resources目录下面新建文件log4j2.xml,如图

三、在log4j2.xml文件中输入如下代码

<?xml version="1.0" encoding="UTF-8"?>

<configuration status="OFF">
    <Properties>
        <property name="console_log_pattern">%d{yyyy-MM-dd HH:mm:ss.SSS} [%level] [%t] %l %n %m%n</property>
        <property name="file_log_pattern">%d{yyyy-MM-dd HH:mm:ss.SSS} [%level] [%t] %C.%M[%L line] %n %m%n</property>
        <property name="every_file_size">20MB</property>
    </Properties>

    <appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <ThresholdFilter level="INFO" onMatch="ACCEPT" onMismatch="DENY"/>
            <PatternLayout pattern="${console_log_pattern}"/>
        </Console>

        <RollingFile name="DEBUG" fileName="./log/log4j2/debug.log"
                     filePattern="./log/log4j2/debug_log_archive/debug-%d{yyyy-MM-dd}-%i.log.zip">
            <PatternLayout pattern="${file_log_pattern}"/>
            <Policies>
                <SizeBasedTriggeringPolicy size="${every_file_size}"/>
            </Policies>
            <Filters>
                <ThresholdFilter level="DEBUG" onMatch="ACCEPT" onMismatch="DENY"/>
            </Filters>
        </RollingFile>

        <RollingFile name="INFO" fileName="./log/log4j2/info.log"
                     filePattern="./log/log4j2/info_log_archive/info-%d{yyyy-MM-dd}-%i.log.zip">
            <PatternLayout pattern="${file_log_pattern}"/>
            <Policies>
                <SizeBasedTriggeringPolicy size="${every_file_size}"/>
            </Policies>
            <Filters>
                <ThresholdFilter level="INFO" onMatch="ACCEPT" onMismatch="DENY"/>
            </Filters>
        </RollingFile>

        <RollingFile name="WARN" fileName="./log/log4j2/warn.log"
                     filePattern="./log/log4j2/warn_log_archive/warn-%d{yyyy-MM-dd}-%i.log.zip">
            <PatternLayout pattern="${file_log_pattern}"/>
            <Policies>
                <SizeBasedTriggeringPolicy size="${every_file_size}"/>
            </Policies>
            <Filters>
                <ThresholdFilter level="WARN" onMatch="ACCEPT" onMismatch="DENY"/>
            </Filters>
        </RollingFile>

        <RollingFile name="ERROR" fileName="./log/log4j2/error.log"
                     filePattern="./log/log4j2/error_log_archive/error-%d{yyyy-MM-dd}-%i.log.zip">
            <PatternLayout pattern="${file_log_pattern}"/>
            <Policies>
                <SizeBasedTriggeringPolicy size="${every_file_size}"/>
            </Policies>
            <Filters>
                <ThresholdFilter level="ERROR" onMatch="ACCEPT" onMismatch="DENY"/>
            </Filters>
        </RollingFile>

    </appenders>

    <loggers>
        <!-- 属性 level 是用于设置最低需要输出的日志输出级别 -->
        <root level="DEBUG">
            <appender-ref ref="Console"/>
            <appender-ref ref="DEBUG"/>
            <appender-ref ref="INFO"/>
            <appender-ref ref="WARN"/>
            <appender-ref ref="ERROR"/>
        </root>
    </loggers>
</configuration>

四、在application.yaml文件中做如下配置，如果 Log4j2 的日志配置文件名为 log4j2.xml 或 log4j2-spring.xml，且放在 resource 目录下，那就算是不在 Spring Boot 配置文件中引入此 Log4j2 的日志配置，Spring Boot 也会自动读取该 Log4j2 的日志配置。不过，最好还是显式地引入此配置。

五、在需要使用日志的类上面加上注解@Slf4j即可

文章参考：https://blog.csdn.net/qq_29864051/article/details/130881230
https://blog.csdn.net/wangpaiblog/article/details/132178523