SpringBoot 配置Sl4j

springboot的slf4j底层采用logback作日志。简单的配置在properties文件中配就行了。需要更多功能时还要建xml文件进行配置。

一般的日志4种级别就足够了：

• ERROR 为严重错误 主要是程序的错误
• WARN 为一般警告，比如session丢失
• INFO 为一般要显示的信息，比如登录登出
• DEBUG 为程序的调试信息

级别排列从严重到不严重。如果配置的级别为INFO，INFO，WARN，ERROR都默认会在控制台打印。

1.Idea安装Lombok插件，或者导入jar包  配置pom.xml 文件

    org.projectlombok
    lombok
    true


@Slf4j可以省略private static final org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(LogExample.class);
可以直接使用log变量打印info级别以上的的日志,debug默认不打印;

2.application.properties配置文件

logging.config=src/main/resources/logback.xml
logging.level.root=info

指定的日志配置文件是根路径下的logback.xml文件。logging.level用来指示Mapper中的日志输出级别为info，是为了打印出具体的sql，
方便定位问题，部署到生产环境时，也将这个级别改成error即可。

3.配置logback文件

<?xml version="1.0" encoding="UTF-8"?>




<configuration  scan="true" scanPeriod="10 seconds">

    

    <contextName>logbackcontextName>
    
    <property name="log.path" value="E:/log" />

    
    
    <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" />
    
    <property name="CONSOLE_LOG_PATTERN" value="${CONSOLE_LOG_PATTERN:-%clr(%d{yyyy-MM-dd HH:mm:ss.SSS}){faint} %clr(${LOG_LEVEL_PATTERN:-%5p}) %clr(${PID:- }){magenta} %clr(---){faint} %clr([%15.15t]){faint} %clr(%-40.40logger{39}){cyan} %clr(:){faint} %m%n${LOG_EXCEPTION_CONVERSION_WORD:-%wEx}}"/>


    
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>infolevel>
        filter>
        <encoder>
            <Pattern>${CONSOLE_LOG_PATTERN}Pattern>
            
            <charset>UTF-8charset>
        encoder>
    appender>


    

    
    <appender name="DEBUG_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        
        <file>${log.path}/log_debug.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}/debug/log-debug-%d{yyyy-MM-dd}.%i.logfileNamePattern>
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>100MBmaxFileSize>
            timeBasedFileNamingAndTriggeringPolicy>
            
            <maxHistory>15maxHistory>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>debuglevel>
            <onMatch>ACCEPTonMatch>
            <onMismatch>DENYonMismatch>
        filter>
    appender>

    
    <appender name="INFO_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        
        <file>${log.path}/log_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}/info/log-info-%d{yyyy-MM-dd}.%i.logfileNamePattern>
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>100MBmaxFileSize>
            timeBasedFileNamingAndTriggeringPolicy>
            
            <maxHistory>15maxHistory>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>infolevel>
            <onMatch>ACCEPTonMatch>
            <onMismatch>DENYonMismatch>
        filter>
    appender>

    
    <appender name="WARN_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        
        <file>${log.path}/log_warn.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}/warn/log-warn-%d{yyyy-MM-dd}.%i.logfileNamePattern>
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>100MBmaxFileSize>
            timeBasedFileNamingAndTriggeringPolicy>
            
            <maxHistory>15maxHistory>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>warnlevel>
            <onMatch>ACCEPTonMatch>
            <onMismatch>DENYonMismatch>
        filter>
    appender>


    
    <appender name="ERROR_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        
        <file>${log.path}/log_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}/error/log-error-%d{yyyy-MM-dd}.%i.logfileNamePattern>
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>100MBmaxFileSize>
            timeBasedFileNamingAndTriggeringPolicy>
            
            <maxHistory>15maxHistory>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>ERRORlevel>
            <onMatch>ACCEPTonMatch>
            <onMismatch>DENYonMismatch>
        filter>
    appender>

    
    
    
    


    

    

    <root level="info">
        <appender-ref ref="CONSOLE" />
        <appender-ref ref="DEBUG_FILE" />
        <appender-ref ref="INFO_FILE" />
        <appender-ref ref="WARN_FILE" />
        <appender-ref ref="ERROR_FILE" />
    root>

    
    
    
    
    
    
    
    
    
    

configuration>

保存运行测试     ~~~~~~~~~~~over~~~~~~~~~