Slf4j + Logback日志框架
先引入相关依赖（当然很多包会间接依赖这些依赖）
<dependency>
<groupId>org.projectlombokgroupId>
<artifactId>lombokartifactId>
<version>1.18.0version>
dependency>
<dependency>
<groupId>org.slf4jgroupId>
<artifactId>slf4j-apiartifactId>
<version>1.7.25version>
dependency>
<dependency>
<groupId>ch.qos.logbackgroupId>
<artifactId>logback-classicartifactId>
<version>1.2.3version>
dependency>
<dependency>
<groupId>org.junit.jupitergroupId>
<artifactId>junit-jupiter-apiartifactId>
<version>5.2.0version>
<scope>testscope>
dependency>
这里使用Slf4j的原因，市面上有很多日志框架，Slf4j可以看作一个接口或类似jdbc，将不同的日志框架整合起来，方便我们在一个项目中需要改变日志框架时，可以很好的进行维护。这里我们使用的是Slf4j + logback的方式。
另外，Slf4j 日志输出采用占位符｛｝的方式，相对于其他的日志框架可以避免很多字符串拼接而造成的性能问题。
接下来聊一聊关于logback配置文件的问题：
<configuration scan="true" scanPeriod="10 seconds">
<contextName>austincontextName>
<property name="log.path" value="logs"/>
<springProperty scope="context" name="grayLogIp" source="austin.business.graylog.ip"/>
<property name="LOG_PATTERN" value="[%d{yyyy-MM-dd HH:mm:ss.SSS}][%-5level][%t][%file:%line][%X{traceId}] -| %m%n"/>
<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%npattern>
<charset>UTF-8charset>
encoder>
appender>
<appender name="INFO_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${log.path}/austin-info.logfile>
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%npattern>
<charset>UTF-8charset>
encoder>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${log.path}/logs/austin-info-%d{yyyy-MM-dd}.%i.logfileNamePattern>
<timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
<maxFileSize>1000MBmaxFileSize>
timeBasedFileNamingAndTriggeringPolicy>
<maxHistory>15maxHistory>
rollingPolicy>
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<level>infolevel>
<onMatch>ACCEPTonMatch>
<onMismatch>DENYonMismatch>
filter>
appender>
<appender name="ERROR_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${log.path}/austin-error.logfile>
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%npattern>
<charset>UTF-8charset>
encoder>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${log.path}/logs/austin-error-%d{yyyy-MM-dd}.%i.logfileNamePattern>
<timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
<maxFileSize>1000MBmaxFileSize>
timeBasedFileNamingAndTriggeringPolicy>
<maxHistory>15maxHistory>
rollingPolicy>
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<level>ERRORlevel>
<onMatch>ACCEPTonMatch>
<onMismatch>DENYonMismatch>
filter>
appender>
<appender name="GELF" class="de.siegmar.logbackgelf.GelfUdpAppender">
<graylogHost>${grayLogIp}graylogHost>
<graylogPort>12201graylogPort>
<maxChunkSize>508maxChunkSize>
<useCompression>trueuseCompression>
<encoder class="de.siegmar.logbackgelf.GelfEncoder">
<includeRawMessage>falseincludeRawMessage>
<includeMarker>trueincludeMarker>
<includeMdcData>trueincludeMdcData>
<includeCallerData>falseincludeCallerData>
<includeRootCauseData>falseincludeRootCauseData>
<includeLevelName>trueincludeLevelName>
<shortPatternLayout class="ch.qos.logback.classic.PatternLayout">
<pattern>%m%nopexpattern>
shortPatternLayout>
<fullPatternLayout class="ch.qos.logback.classic.PatternLayout">
<pattern>%d - [%thread] %-5level %logger{35} - %msg%npattern>
fullPatternLayout>
<staticField>app_name:austinstaticField>
encoder>
appender>
<root level="info">
<appender-ref ref="CONSOLE"/>
<appender-ref ref="INFO_FILE"/>
<appender-ref ref="ERROR_FILE"/>
<appender-ref ref="GELF"/>
root>
configuration>
当spring加载时会自动去路径下找到logback.xml的名字的文件并加载配置
另一种写法：
<configuration scan="true" scanPeriod="60 seconds" debug="false">
<property name="log.level" value="debug"/>
<property name="log.maxHistory" value="10" />
<property name="log.filePath" value="logs"/>
<property name="log.pattern"
value="%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n"/>
<appender name="consoleAppender" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>${log.pattern}pattern>
<charset>UTF-8charset>
encoder>
appender>
<appender name="debugAppender"
class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${log.filePath}/debug.logfile>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${log.filePath}/debug/debug.%d{yyyy-MM-dd}.logfileNamePattern>
<maxHistory>${log.maxHistory}maxHistory>
rollingPolicy>
<encoder>
<pattern>${log.pattern}pattern>
<charset>UTF-8charset>
encoder>
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<level>DEBUGlevel>
<onMatch>ACCEPTonMatch>
<onMismatch>DENYonMismatch>
filter>
appender>
<appender name="infoAppender"
class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${log.filePath}/info.logfile>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${log.filePath}/info/info.%d{yyyy-MM-dd}.logfileNamePattern>
<maxHistory>${log.maxHistory}maxHistory>
rollingPolicy>
<encoder>
<pattern>${log.pattern}pattern>
<charset>UTF-8charset>
encoder>
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<level>INFOlevel>
<onMatch>ACCEPTonMatch>
<onMismatch>DENYonMismatch>
filter>
appender>
<appender name="errorAppender"
class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${log.filePath}/error.logfile>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${log.filePath}/error/error.%d{yyyy-MM-dd}.logfileNamePattern>
<maxHistory>${log.maxHistory}maxHistory>
rollingPolicy>
<encoder>
<pattern>${log.pattern}pattern>
<charset>UTF-8charset>
encoder>
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<level>ERRORlevel>
<onMatch>ACCEPTonMatch>
<onMismatch>DENYonMismatch>
filter>
appender>
<logger name="com.joofeel.miniprogram" level="${log.level}" additivity="true">
<appender-ref ref="infoAppender"/>
<appender-ref ref="debugAppender"/>
<appender-ref ref="errorAppender"/>
logger>
<root level="info">
<appender-ref ref="consoleAppender"/>
root>
configuration>
使用
@Slf4j
class UserServiceImpl{
public void deleteUser(int id){
log.info("传入id为｛｝",id);
}
}
@Slf4j是Lombok的注解，代替了一下语句
Logger log=LoggerFactory.getLogger();