默认使用slf4j + logback 进行实现

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

快速入门

直接使用spring配置

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logging.level.cn.quguai = debug

logging.pattern.console=[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%p] %c -%m%n
logging.pattern.file=[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%p] %c -%m%n

# 两者只能留下一个path默认文件名是spring.log
#logging.file.name=./logs/springboot.log
logging.file.path=./logs 

logging.logback.rollingpolicy.file-name-pattern=${logging.file.path}/roll_logback.%d{yyyy-MM-dd-HH-mm-ss}.log%i.zip
logging.logback.rollingpolicy.max-file-size=1KB
logging.logback.rollingpolicy.max-history=30
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@SpringBootTest
class SpringBootLogApplicationTests {
	
	private static final Logger logger = LoggerFactory.getLogger(SpringBootLogApplicationTests.class);
	
	@Test
	void contextLoads() {
		logger.info("info");  // 默认级别
		logger.debug("debug");
		
		// 即使桥接器的形式使用log4j2的门面输出，默认还是会转为slf4j+logback
		org.apache.logging.log4j.Logger logger = LogManager.getLogger(SpringBootLogApplicationTests.class);
		logger.info("info log4j2");
		logger.debug("debug log4j2");
	}
}

指定配置

给类路径下放上每个日志框架自己的配置文件；SpringBoot就不使用默认配置的了

日志框架 配置文件
Logback logback-spring.xml, logback.xml
Log4j2 log4j2-spring.xml ， log4j2.xml
JUL logging.properties

使用SpringBoot解析日志配置

logback-spring.xml：由SpringBoot解析日志配置。

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<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
	<springProfile name="default">
		<pattern>${pattern}</pattern>
	</springProfile>
	<springProfile name="test">
		<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %c{36} ==== %msg%n</pattern>
	</springProfile>
</encoder>
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spring.profiles.active=test

日志切换到log4j2

image.png

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<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-web</artifactId>
	<exclusions>
		<exclusion>   <== 排除logging依赖：logback依赖
																				 <groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-logging</artifactId>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupId>org.springframework.boot</groupId>  <== 引入log4j2的依赖，底层依然使用slf4j
	<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>

image.png