# learn-log

**Repository Path**: dwdyoung/learn-log

## Basic Information

- **Project Name**: learn-log
- **Description**: 使用log4j，log4j2，logback
- **Primary Language**: Java
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 1
- **Created**: 2023-02-22
- **Last Updated**: 2023-02-22

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# log4j,log4j2,logback日志框架的使用
## SpringBoot环境下使用
> 目标：
> 以debug，info，error三个日志级别为例，控制台能打印这三个日志级别，同时将不同的级别输出到不同的日志文件
### log4j
- Maven依赖
```xml
    <dependencies>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.36</version>
    </dependency>

    <!--添加log4j-->
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.7.32</version>
    </dependency>
</dependencies>
```
- log4j.properties
```properties
# LOG4J配置
#注意：DEBUG控制全局的日志级别
log4j.rootCategory=DEBUG, console, infoFile, errorFile ,debugFile
LOG_PATH=E:/logs/learn-log/log4j
LOG_PATTERN=[%d{yyyy-MM-dd HH:mm:ss,SSS}]-[%p]:%m %x %n
# 控制台输出
log4j.appender.console = org.apache.log4j.ConsoleAppender
log4j.appender.console.Target = System.out
log4j.appender.console.layout = org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern =${LOG_PATTERN}

##debug以上级别的日志会进入改文件
#log4j.appender.debugFile = org.apache.log4j.DailyRollingFileAppender
log4j.appender.debugFile =com.hx.learn.log.log4j.config.AppenderConfig
log4j.appender.debugFile.Threshold = DEBUG
log4j.appender.debugFile.File = ${LOG_PATH}/debug.log
log4j.appender.debugFile.DatePattern = '.'yyyy-MM-dd'.log'
log4j.appender.debugFile.Append=true
log4j.appender.debugFile.layout = org.apache.log4j.PatternLayout
log4j.appender.debugFile.layout.ConversionPattern =${LOG_PATTERN}

##info以上级别的日志会进入改文件
#log4j.appender.infoFile = org.apache.log4j.DailyRollingFileAppender
log4j.appender.infoFile =com.hx.learn.log.log4j.config.AppenderConfig
log4j.appender.infoFile.Threshold = INFO
log4j.appender.infoFile.File = ${LOG_PATH}/log.log
log4j.appender.infoFile.DatePattern = '.'yyyy-MM-dd'.log'
log4j.appender.infoFile.Append=true
log4j.appender.infoFile.layout = org.apache.log4j.PatternLayout
log4j.appender.infoFile.layout.ConversionPattern =${LOG_PATTERN}
## error以上级别的日志会进入改文件
#log4j.appender.errorFile = org.apache.log4j.DailyRollingFileAppender
log4j.appender.errorFile =com.hx.learn.log.log4j.config.AppenderConfig
log4j.appender.errorFile.Threshold = ERROR
log4j.appender.errorFile.File = ${LOG_PATH}/error.log
log4j.appender.errorFile.DatePattern = '.'yyyy-MM-dd'.log'
log4j.appender.errorFile.Append=true
log4j.appender.errorFile.layout = org.apache.log4j.PatternLayout
log4j.appender.errorFile.layout.ConversionPattern =${LOG_PATTERN}

```
### log4j2
- Maven依赖
```xml
<dependencies>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.36</version>
    </dependency>

    <!--添加log4j2-->
    <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-slf4j-impl</artifactId>
        <version>2.17.1</version>
    </dependency>
</dependencies>

```
- log4j.xml
```xml
<?xml version="1.0" encoding="UTF-8"?>
<!-- status表示log4j2本身的日志信息打印级别，和下面的level，不是一个概念 -->
<!--TRACE < DEBUG < INFO < WARN < ERROR < FATAL < OFF-->
<Configuration status="OFF" monitorInterval="30">
    <Properties>
        <!-- 格式化输出：%date表示日期，%thread表示线程名，%-5level：级别从左显示5个字符宽度 %msg：日志消息，%n是换行符-->
        <!-- %logger{36} 表示 Logger 名字最长36个字符 -->
        <property name="LOG_PATTERN" value="[%d{yyyy-MM-dd HH:mm:ss.SSS}] [%thread] %-5level %logger{36} - %msg%n" />
        <!-- 定义日志存储的路径 -->
        <Property name="LOG_FILE_PATH">E:/logs/learn-log/log4j2</Property>
        <property name="FILE_NAME" value="log4j2" />
    </Properties>
    <Appenders>
        <!--打印到控制台-->
        <Console name="ConsoleAppender" target="SYSTEM_OUT" follow="true">
            <PatternLayout pattern="${LOG_PATTERN}"/>
            <!--控制台只输出level及其以上级别的信息（onMatch），其他的直接拒绝（onMismatch）-->
            <ThresholdFilter level="debug" onMatch="ACCEPT" onMismatch="DENY"/>
        </Console>

        <!-- 这个会打印出所有的debug及以下级别的信息，每次大小超过size，则这size大小的日志会自动存入按年份-月份建立的文件夹下面并进行压缩，作为存档-->
        <RollingFile name="RollingFileDebug" fileName="${LOG_FILE_PATH}/${FILE_NAME}_debug.log" filePattern="${FILE_PATH}/${FILE_NAME}-INFO-%d{yyyy-MM-dd}_%i.log.gz">
            <!--控制台只输出level及以上级别的信息（onMatch），其他的直接拒绝（onMismatch）-->
           <!-- <ThresholdFilter level="debug" onMatch="ACCEPT" onMismatch="DENY"/>-->
            <Filters>
                <ThresholdFilter level="INFO" onMatch="DENY" onMismatch="NEUTRAL"/>
                <ThresholdFilter level="debug" onMatch="ACCEPT" onMismatch="DENY"/>
            </Filters>
            <PatternLayout pattern="${LOG_PATTERN}"/>
            <Policies>
                <!--interval属性用来指定多久滚动一次，默认是1 hour-->
                <TimeBasedTriggeringPolicy interval="1"/>
                <SizeBasedTriggeringPolicy size="10MB"/>
            </Policies>
            <!-- DefaultRolloverStrategy属性如不设置，则默认为最多同一文件夹下7个文件开始覆盖-->
            <DefaultRolloverStrategy max="15"/>
        </RollingFile>

        <!-- 这个会打印出所有的info及以下级别的信息，每次大小超过size，则这size大小的日志会自动存入按年份-月份建立的文件夹下面并进行压缩，作为存档-->
        <RollingFile name="RollingFileInfo" fileName="${LOG_FILE_PATH}/${FILE_NAME}_info.log" filePattern="${FILE_PATH}/${FILE_NAME}-INFO-%d{yyyy-MM-dd}_%i.log.gz">
            <!--控制台只输出level及以上级别的信息（onMatch），其他的直接拒绝（onMismatch）-->
            <!--<ThresholdFilter level="info" onMatch="ACCEPT" onMismatch="DENY"/>-->
            <Filters>
                <!--通过交集的方式只匹配INFO级别日志-->
                <ThresholdFilter level="ERROR" onMatch="DENY" onMismatch="NEUTRAL"/>
                <ThresholdFilter level="INFO" onMatch="ACCEPT" onMismatch="DENY"/>
            </Filters>
            <PatternLayout pattern="${LOG_PATTERN}"/>
            <Policies>
                <!--interval属性用来指定多久滚动一次，默认是1 hour-->
                <TimeBasedTriggeringPolicy interval="1"/>
                <SizeBasedTriggeringPolicy size="10MB"/>
            </Policies>
            <!-- DefaultRolloverStrategy属性如不设置，则默认为最多同一文件夹下7个文件开始覆盖-->
            <DefaultRolloverStrategy max="15"/>
        </RollingFile>

        <!-- 这个会打印出所有的info及以下级别的信息，每次大小超过size，则这size大小的日志会自动存入按年份-月份建立的文件夹下面并进行压缩，作为存档-->
        <RollingFile name="RollingFileError" fileName="${LOG_FILE_PATH}/${FILE_NAME}_error.log" filePattern="${FILE_PATH}/${FILE_NAME}-INFO-%d{yyyy-MM-dd}_%i.log.gz">
            <!--控制台只输出level及以上级别的信息（onMatch），其他的直接拒绝（onMismatch）-->
            <ThresholdFilter level="error" onMatch="ACCEPT" onMismatch="DENY"/>
            <PatternLayout pattern="${LOG_PATTERN}"/>
            <Policies>
                <!--interval属性用来指定多久滚动一次，默认是1 hour-->
                <TimeBasedTriggeringPolicy interval="1"/>
                <SizeBasedTriggeringPolicy size="10MB"/>
            </Policies>
            <!-- DefaultRolloverStrategy属性如不设置，则默认为最多同一文件夹下7个文件开始覆盖-->
            <DefaultRolloverStrategy max="15"/>
        </RollingFile>

    </Appenders>

    <Loggers>
        <!-- 此level设置的日志级别，是过滤项目中输出的日志信息，和ThresholdFilter的level有所区别 -->
        <Root level="DEBUG">
            <AppenderRef ref="ConsoleAppender" />
            <AppenderRef ref="RollingFileDebug" />
            <AppenderRef ref="RollingFileInfo" />
            <AppenderRef ref="RollingFileError" />
        </Root>
    </Loggers>
</Configuration>
```
### log4back
- Maven依赖
```xml
    <dependencies>
    <!--日志门面-->
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.36</version>
    </dependency>
    <!--日志实现-->
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-classic</artifactId>
        <version>1.2.11</version>
    </dependency>
</dependencies>
```
- logback.xml
```xml
<configuration debug="false" scan="true" scanPeriod="10 seconds">

    <contextName>logback</contextName>

    <!--输出sql语句-->
    <!--    <logger name="com.hx.ams.admin.mapper" level="debug"/>-->
    <property name="path" value="E:/logs/learn-log/logback"/>
    <property name="maxHistory" value="30"/>
    <property name="maxFileSize" value="50MB"/>

    <appender name="console" class="ch.qos.logback.core.ConsoleAppender">
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>debug</level>
        </filter>
        <encoder>
            <pattern>[%date] %level [%thread] %logger{36} [%file : %line] %msg%n
            </pattern>
        </encoder>
    </appender>

    <appender name="debug_file" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${path}/debug.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- 每天一归档 -->
            <fileNamePattern>${path}/debug.log.%d{yyyy-MM-dd}-%i.zip</fileNamePattern>
            <maxHistory>${maxHistory}</maxHistory>
            <timeBasedFileNamingAndTriggeringPolicy
                    class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>${maxFileSize}</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
        </rollingPolicy>
        <encoder>
            <pattern>[%date] %level [%thread] %logger{36} [%file : %line] %msg%n
            </pattern>
        </encoder>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>DEBUG</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
    </appender>

    <appender name="info_file" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${path}/info.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- 每天一归档 -->
            <fileNamePattern>${path}/info.log.%d{yyyy-MM-dd}-%i.zip</fileNamePattern>
            <maxHistory>${maxHistory}</maxHistory>
            <timeBasedFileNamingAndTriggeringPolicy
                    class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>${maxFileSize}</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
        </rollingPolicy>
        <encoder>
            <pattern>[%date] %level [%thread] %logger{36} [%file : %line] %msg%n
            </pattern>
        </encoder>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>INFO</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
    </appender>

    <appender name="warn_file" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${path}/warn.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- 每天一归档 -->
            <fileNamePattern>${path}/warn.log.%d{yyyy-MM-dd}-%i.zip</fileNamePattern>
            <maxHistory>${maxHistory}</maxHistory>
            <timeBasedFileNamingAndTriggeringPolicy
                    class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>${maxFileSize}</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
        </rollingPolicy>
        <encoder>
            <pattern>[%date] %level [%thread] %logger{36} [%file : %line] %msg%n
            </pattern>
        </encoder>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>WARN</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
    </appender>


    <appender name="error_file" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${path}/error.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- 每天一归档 -->
            <fileNamePattern>${path}/error.log.%d{yyyy-MM-dd}-%i.zip</fileNamePattern>
            <maxHistory>${maxHistory}</maxHistory>
            <timeBasedFileNamingAndTriggeringPolicy
                    class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>${maxFileSize}</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
        </rollingPolicy>
        <encoder>
            <pattern>[%date] %level [%thread] %logger{36} [%file : %line] %msg%n
            </pattern>
        </encoder>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>ERROR</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
    </appender>

    <root>
        <level value="debug"/>
        <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>

```