0、前言
日志记录对系统来说必不可少,spring boot中常用的日志组件有log4j、logback、log4j2,其中logback是spring boot默认的,已自带;选用log4j2就可以,其他的不必去关注;
一、集成log4j2日志组件
1、pom依赖中去除默认的logback日志框架:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<!-- 7-1 去掉自带的日志依赖-->
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
2、添加依赖
<!-- 7-2、集成log4j2 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>
<!-- 额外添加disruptor依赖,用于解决log4j2日志版本较低报错问题-->
<dependency>
<groupId>com.lmax</groupId>
<artifactId>disruptor</artifactId>
<version>3.4.2</version>
</dependency>
3、增加日志配置文件log4j2-dev.xml
<?xml version="1.0" encoding="UTF-8"?>
<!--设置log4j2的自身log级别为warn-->
<!--日志级别以及优先级排序: OFF > FATAL > ERROR > WARN > INFO > DEBUG > TRACE > ALL -->
<!--Configuration后面的status,这个用于设置log4j2自身内部的信息输出,可以不设置,
当设置成trace时,你会看到log4j2内部各种详细输出-->
<!--monitorInterval:Log4j能够自动检测修改配置 文件和重新配置本身,设置间隔秒数-->
<Configuration status="INFO" monitorInterval="30">
<Properties>
<!-- 输出路径 -->
<Property name="logpath">/Log4j/logs/log/dev</Property>
</Properties>
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout
pattern="[%d][%-5p][%t] %m (%F:%L)%n"/>
</Console>
<RollingFile name="debug" fileName="${logpath}/debug/erp_debug.log"
filePattern="${logpath}/debug/erp_debug_%d{yyyy-MM-dd}-%i.log">
<Filters>
<ThresholdFilter level="info" onMatch="DENY" onMismatch="NEUTRAL"/>
<ThresholdFilter level="debug" onMatch="ACCEPT" onMismatch="DENY"/>
</Filters>
<PatternLayout pattern="[%d][%-5p][%t] %m (%F:%L)%n"/>
<Policies>
<TimeBasedTriggeringPolicy interval="24" modulate="true"/>
<SizeBasedTriggeringPolicy size="50 MB"/>\
</Policies>
<DefaultRolloverStrategy max="30">
<Delete basePath="${logpath}/debug" maxDepth="1">
<IfFileName glob="erp_debug_*.log"/>
<IfLastModified age="15d"/>
</Delete>
</DefaultRolloverStrategy>
</RollingFile>
<RollingFile name="info" fileName="${logpath}/info/erp_info.log"
filePattern="${logpath}/info/erp_info_%d{yyyy-MM-dd}-%i.log">
<Filters>
<ThresholdFilter level="warn" onMatch="DENY" onMismatch="NEUTRAL"/>
<ThresholdFilter level="info" onMatch="ACCEPT" onMismatch="DENY"/>
</Filters>
<PatternLayout pattern="[%d][%-5p][%t] %m (%F:%L)%n"/>
<Policies>
<TimeBasedTriggeringPolicy interval="24" modulate="true"/>
<SizeBasedTriggeringPolicy size="50 MB"/>\
</Policies>
<DefaultRolloverStrategy max="30">
<Delete basePath="${logpath}/info" maxDepth="1">
<IfFileName glob="erp_info_*.log"/>
<IfLastModified age="15d"/>
</Delete>
</DefaultRolloverStrategy>
</RollingFile>
<RollingFile name="warn" fileName="${logpath}/warn/erp_warn.log"
filePattern="${logpath}/warn/erp_warn_%d{yyyy-MM-dd}-%i.log">
<Filters>
<ThresholdFilter level="error" onMatch="DENY" onMismatch="NEUTRAL"/>
<ThresholdFilter level="warn" onMatch="ACCEPT" onMismatch="DENY"/>
</Filters>
<PatternLayout pattern="[%d][%-5p][%t] %m (%F:%L)%n"/>
<Policies>
<TimeBasedTriggeringPolicy interval="24" modulate="true"/>
<SizeBasedTriggeringPolicy size="50 MB"/>\
</Policies>
<DefaultRolloverStrategy max="30">
<Delete basePath="${logpath}/warn" maxDepth="1">
<IfFileName glob="erp_warn_*.log"/>
<IfLastModified age="15d"/>
</Delete>
</DefaultRolloverStrategy>
</RollingFile>
<RollingFile name="error" fileName="${logpath}/error/erp_error.log"
filePattern="${logpath}/error/erp_error_%d{yyyy-MM-dd}-%i.log">
<Filters>
<ThresholdFilter level="fatal" onMatch="DENY" onMismatch="NEUTRAL"/>
<ThresholdFilter level="error" onMatch="ACCEPT" onMismatch="DENY"/>
</Filters>
<PatternLayout pattern="[%d][%-5p][%t] %m (%F:%L)%n"/>
<Policies>
<TimeBasedTriggeringPolicy interval="24" modulate="true"/>
<!-- 每个文件最大50M -->
<SizeBasedTriggeringPolicy size="50 MB"/>\
</Policies>
<DefaultRolloverStrategy max="30">
<Delete basePath="${logpath}/error" maxDepth="1">
<IfFileName glob="erp_error_*.log"/>
<!-- 设置最大保存时间为15天-->
<IfLastModified age="15d"/>
</Delete>
</DefaultRolloverStrategy>
</RollingFile>
</Appenders>
<!--切换输出级别-->
<Loggers>
<Root level="info">
<AppenderRef ref="Console"/>
<AppenderRef ref="debug"/>
<AppenderRef ref="info"/>
<AppenderRef ref="warn"/>
<AppenderRef ref="error"/>
</Root>
</Loggers>
</Configuration>
配置文件中增加配置:
#################### 7 log4j2 ###################
logging.config=classpath:log4j2-dev.xml
logging.level.org.springframework=INFO
4、使用
private static final Logger logger = LoggerFactory.getLogger(UserController.class);
logger.info("未知异常!原因是:info");
logger.error("未知异常!原因是:error");
logger.warn("未知异常!原因是:warn");
简单用法,完毕~
微服务中,服务众多,分布在各个服务器中,我们一般不这样使用,我们一般使用ELK来对日志进行统一收集和分析处理,ELK后面再说