logback

• logback-core：其它两个模块的基础模块。
• logback-classic：它是log4j的一个改良版本，同时它完整实现了slf4j API使你可以很方便地更换成其它日志系统如log4j或JDK14 Logging。
• logback-access：访问模块与Servlet容器集成提供通过Http来访问日志的功能。

默认情况下，Spring Boot会用Logback来记录日志，并用INFO级别输出到控制台。

一、依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><parent><artifactId>springboot-demo</artifactId><groupId>com.et</groupId><version>1.0-SNAPSHOT</version></parent><modelVersion>4.0.0</modelVersion><artifactId>logback</artifactId><properties><maven.compiler.source>8</maven.compiler.source><maven.compiler.target>8</maven.compiler.target></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-autoconfigure</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.16.20</version><scope>provided</scope></dependency></dependencies>
</project>

二、配置文件和启动类

server:port: 8088
logging:config: classpath:logback-spring.xml

logback-spring.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration><property name="LOG_PATH" value="logs" /><property name="LOG_PATTERN" value="%d{yyyy-MM-dd HH:mm:ss.SSS} [%-5level] %-40.40logger{39} : %msg%n" /><!-- 控制台输出 --><appender name="consoleLog" class="ch.qos.logback.core.ConsoleAppender"><!-- 彩色日志 --><layout class="ch.qos.logback.classic.PatternLayout"><pattern>%d{yyyy-MM-dd HH:mm:ss} [%thread] %magenta(%-5level) %green([%-50.50class]) >>> %cyan(%msg) %n</pattern></layout></appender><!-- 按照每天生成日志文件 --><appender name="fileLog"  class="ch.qos.logback.core.rolling.RollingFileAppender"><rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"><!--日志文件输出的文件名--><FileNamePattern>${LOG_PATH}/cms.%d{yyyy-MM-dd}.%i.log</FileNamePattern><!--日志文件最大的大小--><timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP"><maxFileSize>100MB</maxFileSize></timeBasedFileNamingAndTriggeringPolicy><!--日志文件保留天数--><MaxHistory>30</MaxHistory></rollingPolicy><encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder"><pattern>${LOG_PATTERN}</pattern></encoder></appender><!-- 日志输出级别 --><root level="info"><appender-ref ref="consoleLog" /><appender-ref ref="fileLog" /></root></configuration>

三、Controller

@Controller
@Slf4j
public class HelloWorldController {@RequestMapping("/hello")@ResponseBodypublic Map<String, Object> showHelloWorld(){log.info("info日志");Map<String, Object> map = new HashMap<>();map.put("msg", "HelloWorld");return map;}
}

测试：