1. 简介
Logback：是由 log4j 创始人设计的一个开源日志组件。
- Logback官网：https://logback.qos.ch/
- Logback文档：https://logback.qos.ch/documentation.html
Logback 模块：
- logback-core：提供了 Logback 的核心功能，是另外两个组件的基础。
- logback-classic：实现了 Slf4j 的 API，所以当想配合 Slf4j 使用时，需要引入 logback-classic。
- logback-access：为了集成 Servlet 环境而准备的，可提供 HTTP-access 的日志接口。
Logback 是要与 Slf4j 结合起来使用。
Slf4j： Simple Logging Facade for Java，充当各种日志框架（例如：java.util.loggin、logback、log4j）的简单外观或抽象，允许最终用户在部署时插入所需的日志框架。
- Slf4j 官网：https://www.slf4j.org/
- Slf4j 文档：https://www.slf4j.org/manual.html
2. 项目结构
3. 配置文件
3.1 Maven
spring boot依赖：
在Web 项目中，我们直接引入 spring-boot-starter-web 依赖即可。因为 spring-boot-starter-web 包含 spring-boot-starter 包含 spring-boot-starter-logging，所以我们只需要引入 web 组件即可。
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
spring native依赖：
<properties>
<slf4j.version>1.7.32</slf4j.version>
<logback.version>1.2.5</logback.version>
</properties>
<dependencies>
<!-- slf4j -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<!-- logback -->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>${logback.version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>${logback.version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-access</artifactId>
<version>${logback.version}</version>
</dependency>
</dependencies>
3.2 logback-spring.xml
注意：这里使用了 spring.profiles.active，那么配置文件中必须要指定该配置，不然日志会不输出！
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<contextName>${APP_NAME}</contextName>
<springProperty name="APP_NAME" scope="context" source="spring.application.name"/>
<springProperty name="LOG_FILE" scope="context" source="logging.file" defaultValue="../logs"/>
<springProperty name="LOG_POINT_FILE" scope="context" source="logging.file" defaultValue="../logs/point"/>
<springProperty name="LOG_MAXFILESIZE" scope="context" source="logback.filesize" defaultValue="50MB"/>
<springProperty name="LOG_FILEMAXDAY" scope="context" source="logback.filemaxday" defaultValue="7"/>
<springProperty name="ServerIP" scope="context" source="spring.cloud.client.ip-address" defaultValue="0.0.0.0"/>
<springProperty name="ServerPort" scope="context" source="server.port" defaultValue="0000"/>
<!-- 彩色日志 -->
<!-- 彩色日志依赖的渲染类 -->
<conversionRule conversionWord="clr" converterClass="org.springframework.boot.logging.logback.ColorConverter"/>
<conversionRule conversionWord="wex"
converterClass="org.springframework.boot.logging.logback.WhitespaceThrowableProxyConverter"/>
<conversionRule conversionWord="wEx"
converterClass="org.springframework.boot.logging.logback.ExtendedWhitespaceThrowableProxyConverter"/>
<!-- 彩色日志格式 -->
<property name="CONSOLE_LOG_PATTERN"
value="%clr(%d{yyyy-MM-dd HH:mm:ss.SSS}){faint} [%clr(%X{traceId}){yellow},%clr(%X{X-B3-TraceId}){yellow}] %clr(%level){blue} %clr(%logger){cyan} %m%n${LOG_EXCEPTION_CONVERSION_WORD:-%wEx}"/>
<!-- value="[${APP_NAME}:${ServerIP}:${ServerPort}] %clr(%d{yyyy-MM-dd HH:mm:ss.SSS}){faint} [%clr(%X{traceId}){yellow},%clr(%X{X-B3-TraceId}){yellow}] %clr(%level){blue} %clr(${PID}){magenta} %clr([%thread]){orange} %clr(%logger){cyan} %m%n${LOG_EXCEPTION_CONVERSION_WORD:-%wEx}"/> -->
<property name="CONSOLE_LOG_PATTERN_NO_COLOR"
value="%d{yyyy-MM-dd HH:mm:ss.SSS} [%X{traceId},%X{X-B3-TraceId}] %level %logger %m%n${LOG_EXCEPTION_CONVERSION_WORD:-%wEx}"/>
<!-- 控制台日志 -->
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<withJansi>true</withJansi>
<encoder>
<pattern>${CONSOLE_LOG_PATTERN}</pattern>
<charset>UTF-8</charset>
</encoder>
<filter class="com.demo.example.config.MyLogBackFilter"/>
</appender>
<!-- 按照每天生成常规日志文件 -->
<!-- 不用的时候注释掉，防止生成无用的空白文件 -->
<!-- <appender name="ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">-->
<!-- <file>${LOG_FILE}/${APP_NAME}-error.log</file>-->
<!-- <!– 基于时间的分包策略 –>-->
<!-- <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">-->
<!-- <fileNamePattern>${LOG_FILE}/${APP_NAME}-error.%d{yyyy-MM-dd}.%i.log</fileNamePattern>-->
<!-- <maxFileSize>100MB</maxFileSize>-->
<!-- <!–保留时间,单位:天–>-->
<!-- <maxHistory>60</maxHistory>-->
<!-- </rollingPolicy>-->
<!-- <encoder>-->
<!-- <pattern>${CONSOLE_LOG_PATTERN_NO_COLOR}</pattern>-->
<!-- <charset>UTF-8</charset>-->
<!-- </encoder>-->
<!-- <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">-->
<!-- <MaxFileSize>100MB</MaxFileSize>-->
<!-- </triggeringPolicy>-->
<!-- <filter class="ch.qos.logback.classic.filter.LevelFilter"><!– 只打印错误日志 –>-->
<!-- <level>ERROR</level>-->
<!-- <onMatch>ACCEPT</onMatch>-->
<!-- <onMismatch>DENY</onMismatch>-->
<!-- </filter>-->
<!-- </appender>-->
<!-- 按照每天生成常规日志文件 -->
<!-- 不用的时候注释掉，防止生成无用的空白文件 -->
<!-- <appender name="INFO" class="ch.qos.logback.core.rolling.RollingFileAppender">-->
<!-- <file>${LOG_FILE}/${APP_NAME}-info.log</file>-->
<!-- <!– 基于时间的分包策略 –>-->
<!-- <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">-->
<!-- <fileNamePattern>${LOG_FILE}/${APP_NAME}-info.%d{yyyy-MM-dd}.%i.log</fileNamePattern>-->
<!-- <maxFileSize>100MB</maxFileSize>-->
<!-- <!–保留时间,单位:天–>-->
<!-- <maxHistory>60</maxHistory>-->
<!-- </rollingPolicy>-->
<!-- <encoder>-->
<!-- <pattern>${CONSOLE_LOG_PATTERN_NO_COLOR}</pattern>-->
<!-- <charset>UTF-8</charset>-->
<!-- </encoder>-->
<!-- <filter class="ch.qos.logback.classic.filter.LevelFilter">-->
<!-- <level>INFO</level>-->
<!-- <onMatch>ACCEPT</onMatch>-->
<!-- <onMismatch>DENY</onMismatch>-->
<!-- </filter>-->
<!-- </appender>-->
<!-- 按照每天生成常规日志文件 -->
<appender name="ALL" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${LOG_FILE}/${APP_NAME}/${APP_NAME}.jar.log</file>
<!-- 基于时间的分包策略 -->
<rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
<fileNamePattern>${LOG_FILE}/${APP_NAME}/${APP_NAME}.%d{yyyy-MM-dd}.%i.log</fileNamePattern>
<maxFileSize>100MB</maxFileSize>
<!--保留时间,单位:天-->
<maxHistory>60</maxHistory>
</rollingPolicy>
<encoder>
<pattern>${CONSOLE_LOG_PATTERN_NO_COLOR}</pattern>
<charset>UTF-8</charset>
</encoder>
</appender>
<!-- 增加无关日志的显示等级 -->
<logger name="com.ulisesbocchio" level="INFO"/>
<logger name="com.netflix" level="INFO"/>
<logger name="com.zaxxer.hikari" level="INFO"/>
<logger name="com.baomidou" level="INFO"/>
<logger name="org" level="INFO"/>
<logger name="_org" level="INFO"/>
<logger name="io" level="INFO"/>
<!-- 设置输出级别 -->
<!-- 如果不需要根据环境区分配置，则不需要使用springPorfile -->
<!-- <root>-->
<!-- <appender-ref ref="STDOUT"/>-->
<!-- <appender-ref ref="ALL"/>-->
<!-- </root>-->
<!-- 根据环境区分 -->
<!-- 设置输出级别，开发环境(根据spring.profiles.active判断) -->
<springProfile name="dev">
<root level="DEBUG">
<appender-ref ref="STDOUT"/>
<appender-ref ref="ALL"/>
<!-- <appender-ref ref="ERROR"/>-->
<!-- <appender-ref ref="INFO"/>-->
</root>
</springProfile>
<!-- 设置输出级别，生产环境(根据spring.profiles.active判断) -->
<springProfile name="prod">
<root level="DEBUG">
<!-- <appender-ref ref="STDOUT"/>-->
<appender-ref ref="ALL"/>
<!-- <appender-ref ref="ERROR"/>-->
<!-- <appender-ref ref="INFO"/>-->
</root>
</springProfile>
</configuration>
3.3 application.yml
spring:
application:
name: spring-boot-logback 用于生成日志文件名
profiles:
active: dev 用于根据环境输出不同日志级别
4. 自定义输出级别
import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.filter.Filter;
import ch.qos.logback.core.spi.FilterReply;
import java.util.Arrays;
import java.util.List;
/**
* <p> @Title MyLogBackFilter
* <p> @Description 定制控制台日志过滤器
*
* @author DDKK.COM 弟弟快看，程序员编程资料站
* @date 2022/1/6 11:15
*/
public class MyLogBackFilter extends Filter<ILoggingEvent> {
private final List<Level> SHOW_LEVELS = Arrays.asList(Level.ERROR, Level.WARN, Level.INFO, Level.DEBUG, Level.TRACE);
@Override
public FilterReply decide(ILoggingEvent event) {
// 指定打印日志类（供控制台用）
if (event.getLoggerName().contains("org.springframework.boot")
&& !event.getLoggerName().contains("org.springframework.boot.autoconfigure.security.servlet.UserDetailsServiceAutoConfiguration")
&& !event.getLoggerName().contains("org.springframework.boot.autoconfigure.security.reactive.ReactiveUserDetailsServiceAutoConfiguration")) {
// 打印启动信息
return FilterReply.ACCEPT;
} else if (SHOW_LEVELS.contains(event.getLevel())) {
// 打印异常信息
return FilterReply.ACCEPT;
} else {
return FilterReply.DENY;
}
}
}
5. 测试地址
测试地址：http://localhost:8080/tUser/findAll
指定日志路径： java -jar -Dlogging.file=/home/app/data/weblogs
6. 部分内容没有输出到日志文件中问题处理
e.printStackTrace() 和 System.out.println() 不会输出到日志。
如果要输出到日志，需要增加如下依赖：
<!-- System.out System.err 转 info -->
<dependency>
<groupId>uk.org.lidalia</groupId>
<artifactId>sysout-over-slf4j</artifactId>
<version>1.0.2</version>
</dependency>
启动类中进行如下设置：
public static void main(String[] args) {
// 加入这行代码时system.out输出为info日志
SysOutOverSLF4J.sendSystemOutAndErrToSLF4J();
// 启动应用
SpringApplication.run(SpringbootDemoApplication.class, args);
}
7.根据开发、测试、生产环境采用不同的配置
修改SpringBoot项目中 application.yml 文件，来加载不同的logback.xml文件。
loggin:
# 这里替换成你的logback配置文件名称，classpath:不能丢
config: classpath:logback-dev.xml
8.补充1：控制台和日志文件中都不输出日志
问题分析：
这是因为 logback-spring.xml 配置文件中使用了 <springProfile> 标签，当 spring.profiles.active 配置没有设置的时候，logback 不知道应该加载哪个配置，所以干脆不输出日志了。
解决方案：
修改系统配置文件，增加spring.profiles.active 配置即可。
9.补充2：启动报错java.lang.ClassNotFoundException: org.fusesource.jansi.WindowsAnsiOutputStream
虽然报错之后程序也正常启动了，但是我们还是要解决这个问题。
报错截图：
详细报错信息：
Connected to the target VM, address: '127.0.0.1:58824', transport: 'socket'
22:22:30,546 |-INFO in ch.qos.logback.classic.LoggerContext[APP_NAME_IS_UNDEFINED] - Could NOT find resource [logback-test.xml]
22:22:30,547 |-INFO in ch.qos.logback.classic.LoggerContext[APP_NAME_IS_UNDEFINED] - Could NOT find resource [logback.groovy]
22:22:30,548 |-INFO in ch.qos.logback.classic.LoggerContext[APP_NAME_IS_UNDEFINED] - Found resource [logback.xml] at [file:/D:/IdeaProjects/SpringBootExamples/springboot-logback/logback-integration/log-spring-boot-starter/target/classes/logback.xml]
22:22:30,677 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - debug attribute not set
22:22:30,689 |-INFO in ch.qos.logback.classic.joran.action.ContextNameAction - Setting logger context name as [APP_NAME_IS_UNDEFINED]
22:22:30,695 |-ERROR in ch.qos.logback.core.joran.spi.Interpreter@4:87 - no applicable action for [springProperty], current ElementPath is [[configuration][springProperty]]
22:22:30,696 |-ERROR in ch.qos.logback.core.joran.spi.Interpreter@5:99 - no applicable action for [springProperty], current ElementPath is [[configuration][springProperty]]
22:22:30,696 |-ERROR in ch.qos.logback.core.joran.spi.Interpreter@6:111 - no applicable action for [springProperty], current ElementPath is [[configuration][springProperty]]
22:22:30,696 |-ERROR in ch.qos.logback.core.joran.spi.Interpreter@7:107 - no applicable action for [springProperty], current ElementPath is [[configuration][springProperty]]
22:22:30,696 |-ERROR in ch.qos.logback.core.joran.spi.Interpreter@8:105 - no applicable action for [springProperty], current ElementPath is [[configuration][springProperty]]
22:22:30,696 |-ERROR in ch.qos.logback.core.joran.spi.Interpreter@9:117 - no applicable action for [springProperty], current ElementPath is [[configuration][springProperty]]
22:22:30,696 |-ERROR in ch.qos.logback.core.joran.spi.Interpreter@10:97 - no applicable action for [springProperty], current ElementPath is [[configuration][springProperty]]
22:22:30,696 |-INFO in ch.qos.logback.core.joran.action.ConversionRuleAction - registering conversion word clr with class [org.springframework.boot.logging.logback.ColorConverter]
22:22:30,696 |-INFO in ch.qos.logback.core.joran.action.ConversionRuleAction - registering conversion word wex with class [org.springframework.boot.logging.logback.WhitespaceThrowableProxyConverter]
22:22:30,696 |-INFO in ch.qos.logback.core.joran.action.ConversionRuleAction - registering conversion word wEx with class [org.springframework.boot.logging.logback.ExtendedWhitespaceThrowableProxyConverter]
22:22:30,701 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender]
22:22:30,704 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [STDOUT]
22:22:30,707 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property
22:22:30,756 |-INFO in ch.qos.logback.core.ConsoleAppender[STDOUT] - Enabling JANSI WindowsAnsiOutputStream for the console.
22:22:30,758 |-WARN in ch.qos.logback.core.ConsoleAppender[STDOUT] - Failed to create WindowsAnsiOutputStream. Falling back on the default stream. ch.qos.logback.core.util.DynamicClassLoadingException: Failed to instantiate type org.fusesource.jansi.WindowsAnsiOutputStream
at ch.qos.logback.core.util.DynamicClassLoadingException: Failed to instantiate type org.fusesource.jansi.WindowsAnsiOutputStream
at at ch.qos.logback.core.util.OptionHelper.instantiateByClassNameAndParameter(OptionHelper.java:69)
at at ch.qos.logback.core.util.OptionHelper.instantiateByClassNameAndParameter(OptionHelper.java:40)
at at ch.qos.logback.core.ConsoleAppender.getTargetStreamForWindows(ConsoleAppender.java:88)
at at ch.qos.logback.core.ConsoleAppender.start(ConsoleAppender.java:79)
at at ch.qos.logback.core.joran.action.AppenderAction.end(AppenderAction.java:90)
at at ch.qos.logback.core.joran.spi.Interpreter.callEndAction(Interpreter.java:309)
at at ch.qos.logback.core.joran.spi.Interpreter.endElement(Interpreter.java:193)
at at ch.qos.logback.core.joran.spi.Interpreter.endElement(Interpreter.java:179)
at at ch.qos.logback.core.joran.spi.EventPlayer.play(EventPlayer.java:62)
at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:165)
at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:152)
at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:110)
at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:53)
at at ch.qos.logback.classic.util.ContextInitializer.configureByResource(ContextInitializer.java:75)
at at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:150)
at at org.slf4j.impl.StaticLoggerBinder.init(StaticLoggerBinder.java:84)
at at org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:55)
at at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150)
at at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)
at at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:417)
at at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:362)
at at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:388)
at at uk.org.lidalia.sysoutslf4j.context.LoggingSystemRegister.<clinit>(LoggingSystemRegister.java:35)
at at uk.org.lidalia.sysoutslf4j.context.SysOutOverSLF4J.<clinit>(SysOutOverSLF4J.java:48)
at at com.demo.TLogEurekaApplication.main(TLogEurekaApplication.java:14)
Caused by: java.lang.ClassNotFoundException: org.fusesource.jansi.WindowsAnsiOutputStream
at at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at at ch.qos.logback.core.util.OptionHelper.instantiateByClassNameAndParameter(OptionHelper.java:56)
at ... 24 common frames omitted
解决方案：
其实这种情况只是一个logback的重命名问题，将 logback.xml 文件名修改为 logback-spring.xml 就好了。
logback.xml --> logback-spring.xml
整理完毕，完结撒花~ 🌻