SpringBoot项目从0到1配置logback日志打印

目录

一、写文背景
二、准备篇
三、基础篇
  1、输出日志到控制台（console）
  2、将日志输出到文件，如application.log文件
  3、日志分级，将INFO、WARN、ERROR日志分别打印
四、进阶篇
  1、打印指定目录下的日志
  2、切面日志打印
五、写在最后

大家好！我是sum墨，一个一线的底层码农，平时喜欢研究和思考一些技术相关的问题并整理成文，限于本人水平，如果文章和代码有表述不当之处，还请不吝赐教。

以下是正文！

一、写文背景

我们在写后端项目的时候，日志打印是必需的。支持SpringBoot项目的日志框架一般有log4j、logback，这二者各有优劣，这里就不展开对比了。我们项目中常用的是logback框架，该框架主要是一个logback-spring.xml配置文件起作用。每次起新的项目我都是从老项目中copy一份出来，这份配置文件内容很详细，几百行左右，我一般都是修改一下应用名、日志输出路径，新项目就可以用了。这份老文件是之前的一个师兄留下的，我使用的时候也没深入去思考过各个配置的作用，这段时间刚好比较空闲，打算从0开始写出一个自己能看懂的logback-spring.xml。

二、准备篇

首先，我准备了一个空的SpringBoot项目，版本为2.7.13。项目结构图如下：

初始的pom.xml配置文件内容如下：

查看代码

xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0modelVersion>
    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.7.13version>
        <relativePath/> 
    parent>
    <groupId>com.examplegroupId>
    <artifactId>logbackartifactId>
    <version>0.0.1-SNAPSHOTversion>
    <name>logbackname>
    <description>Demo project for Spring Bootdescription>
    <properties>
        <java.version>1.8java.version>
    properties>
    <dependencies>
        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
    dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
            plugin>
        plugins>
    build>

project>

启动日志输出如下：

其次，引入logback核心组件，因为SpringBoot自带logback组件，所以我们在引入的时候不需要指定logback的版本号。

<dependency>
  <groupId>ch.qos.logbackgroupId>
  <artifactId>logback-coreartifactId>
dependency>

 

最后，我们在resources目录下新建一个空的logback-spring.xml文件，代码如下：

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

 

这样我们在启动的时候，打印只有一个banner

三、基础篇

1、输出日志到控制台（console）

刚才我们看到如果logback-spring.xml的配置为空的话，那么只会输出一个banner，其他的日志都不会被打印，所以我们第一步就是要把日志打印到控制台上来。

第一步、配置控制台的appender（logback中appender是负责写日志的组件）

xml version="1.0" encoding="UTF-8"?>
<configuration>
    
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] ${PID:- } %logger{36} %-5level - %msg%npattern>
            <charset>utf8charset>
        encoder>
    appender>
configuration>

第二步、设置打印到控制台的日志的级别

xml version="1.0" encoding="UTF-8"?>
<configuration>
    
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] ${PID:- } %logger{36} %-5level - %msg%npattern>
            <charset>utf8charset>
        encoder>
    appender>

    
    <root level="INFO">
        <appender-ref ref="CONSOLE"/>
    root>
configuration>

 

这时控制台已经有日志输出了，输出格式如下

第三步、加入logback默认的一些配置

上面自定义的输出格式有点丑，logback给我们提供了一些默认的配置和格式，只需要使用include标签引入即可。
代码如下：

xml version="1.0" encoding="UTF-8"?>
<configuration>
    
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>

    
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
    appender>

    
    <root level="INFO">
        <appender-ref ref="CONSOLE"/>
    root>
configuration>

这时我们再启动，发现样式就好看多了

2、将日志输出到文件，如application.log文件

刚才的日志是打印到控制台的，我们一旦把ide关闭就看不到了，所以我们需要把日志输出到一个文件中，以便将日志留存下来。

第一步、定义应用名称，区分应用

xml version="1.0" encoding="UTF-8"?>
<configuration>
    
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>

　　 
　　 <property name="APP_NAME" value="logback-test"/>

　　
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
    appender>

    
    <root level="INFO">
        <appender-ref ref="CONSOLE"/>
    root>
configuration>

第二步、定义日志文件的输出路径

xml version="1.0" encoding="UTF-8"?>
<configuration>
    
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>

    
    <property name="APP_NAME" value="logback-test"/>
    
    <property name="LOG_PATH" value="${user.home}/logs/${APP_NAME}"/>
    
    
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
    appender>

    
    <root level="INFO">
        <appender-ref ref="CONSOLE"/>
    root>
configuration>

第三步、定义日志文件名称和路径

xml version="1.0" encoding="UTF-8"?>
<configuration>
    
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>

    
    <property name="APP_NAME" value="logback-test"/>
    
    <property name="LOG_PATH" value="${user.home}/logs/${APP_NAME}"/>
    
    <property name="LOG_FILE" value="${LOG_PATH}/application.log"/>
    
    
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
    appender>

    
    <root level="INFO">
        <appender-ref ref="CONSOLE"/>
    root>
configuration>

第四步、将日志滚动输出到application.log文件中

xml version="1.0" encoding="UTF-8"?>
<configuration>
    
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>

    
    <property name="APP_NAME" value="logback-test"/>
    
    <property name="LOG_PATH" value="${user.home}/logs/${APP_NAME}"/>
    
    <property name="LOG_FILE" value="${LOG_PATH}/application.log"/>

    
    <appender name="APPLICATION"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        
        <file>${LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
    appender>

    
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
    appender>

    
    <root level="INFO">
        
        <appender-ref ref="CONSOLE"/>
    root>
configuration>

第五步、设置 RollingPolicy 属性，用于配置文件大小限制，保留天数、文件名格式

<configuration>
    
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
   
　　 
    <property name="APP_NAME" value="logback-test"/>
    
    <property name="LOG_PATH" value="${user.home}/logs/${APP_NAME}"/>
    
    <property name="LOG_FILE" value="${LOG_PATH}/application.log"/>

　　
    <appender name="APPLICATION"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        
        <file>${LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_FILE}.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>
    

　　
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
    appender>
  
 　　
    <root level="INFO">
        
        <appender-ref ref="CONSOLE"/>
    root>
configuration>

第六步、追加日志到APPLICATION中

<configuration>
    
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
    
　　
    <property name="APP_NAME" value="logback-test"/>
    
    <property name="LOG_PATH" value="${user.home}/logs/${APP_NAME}"/>
    
    <property name="LOG_FILE" value="${LOG_PATH}/application.log"/>

　　 
    <appender name="APPLICATION"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        
        <file>${LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_FILE}.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>
    
　
　　
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
    appender>
   
　　 
    <root level="INFO">
        
        <appender-ref ref="CONSOLE"/>
        
        <appender-ref ref="APPLICATION"/>
    root>
configuration>

配置好之后，启动项目，找到user.home会发现有一个logback-test的文件，里面有一个application.log文件，如下图

 

温馨提示：如何找到user.home

?

1 2 3 4 5

在Windows上，可以通过打开Windows资源管理器，然后在地址栏中键入%userprofile%来找到user.home。   在Mac上，可以通过打开终端应用程序，然后输入echo $HOME命令来找到user.home。   在Linux上，可以通过打开终端应用程序，然后输入echo $HOME命令来找到user.home。

　　

3、日志分级，将INFO、WARN、ERROR日志分别打印

其实INFO的日志已经在打印在控制台中了，这里我们需要单独把WARN、ERROR拎出来打印，主要是为了方便后续排查bug使用。

第一步、定义WARN、ERROR日志文件路径

<configuration>
    
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
    
    <property name="APP_NAME" value="logback-test"/>
    
    <property name="LOG_PATH" value="${user.home}/logs/${APP_NAME}"/>
    
    <property name="LOG_FILE" value="${LOG_PATH}/application.log"/>
    
    <property name="WARN_LOG_FILE" value="${LOG_PATH}/warn.log"/>
    
    <property name="ERROR_LOG_FILE" value="${LOG_PATH}/error.log"/>
    
    
    <appender name="APPLICATION"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        
        <file>${LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_FILE}.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>
    
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
    appender>
    
    <root level="INFO">
        
        <appender-ref ref="CONSOLE"/>
        
        <appender-ref ref="APPLICATION"/>
    root>
configuration>

第二步、将WARN、ERROR日志摘取出并输出到指定文件中 

<configuration>
    
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
    
    <property name="APP_NAME" value="logback-test"/>
    
    <property name="LOG_PATH" value="${user.home}/logs/${APP_NAME}"/>
    
    <property name="LOG_FILE" value="${LOG_PATH}/application.log"/>
    
    <property name="WARN_LOG_FILE" value="${LOG_PATH}/warn.log"/>
    
    <property name="ERROR_LOG_FILE" value="${LOG_PATH}/error.log"/>

    
    <appender name="APPLICATION"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        
        <file>${LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_FILE}.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>

    
    <appender name="WARN" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${WARN_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/warn.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>WARNlevel>
        filter>
    appender>

    
    <appender name="ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${ERROR_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/error.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>ERRORlevel>
        filter>
    appender>

    
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
    appender>
    
    <root level="INFO">
        
        <appender-ref ref="CONSOLE"/>
        
        <appender-ref ref="APPLICATION"/>
    root>
configuration>

第三步、将WARN、ERROR日志加到控制台打印，并输出到指定文件中 

<configuration>
    
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
    
    <property name="APP_NAME" value="logback-test"/>
    
    <property name="LOG_PATH" value="${user.home}/logs/${APP_NAME}"/>
    
    <property name="LOG_FILE" value="${LOG_PATH}/application.log"/>
    
    <property name="WARN_LOG_FILE" value="${LOG_PATH}/warn.log"/>
    
    <property name="ERROR_LOG_FILE" value="${LOG_PATH}/error.log"/>

    
    <appender name="APPLICATION"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        
        <file>${LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_FILE}.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>

    
    <appender name="WARN" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${WARN_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/warn.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>WARNlevel>
        filter>
    appender>

    
    <appender name="ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${ERROR_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/error.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>ERRORlevel>
        filter>
    appender>

    
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
    appender>

    
    <root level="INFO">
        
        <appender-ref ref="CONSOLE"/>
        
        <appender-ref ref="APPLICATION"/>
        
        <appender-ref ref="WARN"/>
        
        <appender-ref ref="ERROR"/>
    root>
configuration>

在启动之前，我分别加了一条WARN、ERROR日志，启动时自动打印，如下

 同时在logback-test目录下也生成了warn.log和error.log文件。

 

四、进阶篇

1、打印指定目录下的日志

现在我们调整项目结构如下：

我想把service中的日志单独打印出来，输出到service.log中，步骤如下

第一步、定义指定目录日志文件输出路径 

<configuration>
    
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
    
    <property name="APP_NAME" value="logback-test"/>
    
    <property name="LOG_PATH" value="${user.home}/logs/${APP_NAME}"/>
    
    <property name="LOG_FILE" value="${LOG_PATH}/application.log"/>
    
    <property name="WARN_LOG_FILE" value="${LOG_PATH}/warn.log"/>
    
    <property name="ERROR_LOG_FILE" value="${LOG_PATH}/error.log"/>
    
    <property name="SERVICE_LOG_FILE" value="${LOG_PATH}/service.log"/>

    
    <appender name="APPLICATION"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        
        <file>${LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_FILE}.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>

    
    <appender name="WARN" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${WARN_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/warn.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>WARNlevel>
        filter>
    appender>

    
    <appender name="ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${ERROR_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/error.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>ERRORlevel>
        filter>
    appender>

    
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
    appender>

    
    <root level="INFO">
        
        <appender-ref ref="CONSOLE"/>
        
        <appender-ref ref="APPLICATION"/>
        
        <appender-ref ref="WARN"/>
        
        <appender-ref ref="ERROR"/>
    root>
configuration>

第二步、定义指定目录日志的appender

<configuration>
    
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
    
    <property name="APP_NAME" value="logback-test"/>
    
    <property name="LOG_PATH" value="${user.home}/logs/${APP_NAME}"/>
    
    <property name="LOG_FILE" value="${LOG_PATH}/application.log"/>
    
    <property name="WARN_LOG_FILE" value="${LOG_PATH}/warn.log"/>
    
    <property name="ERROR_LOG_FILE" value="${LOG_PATH}/error.log"/>
    
    <property name="SERVICE_LOG_FILE" value="${LOG_PATH}/service.log"/>

    
    <appender name="APPLICATION"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        
        <file>${LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_FILE}.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>

    
    <appender name="WARN" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${WARN_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/warn.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>WARNlevel>
        filter>
    appender>

    
    <appender name="ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${ERROR_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/error.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>ERRORlevel>
        filter>
    appender>

    
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
    appender>

    
    <appender name="SERVICE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${SERVICE_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/service.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>

    
    <root level="INFO">
        
        <appender-ref ref="CONSOLE"/>
        
        <appender-ref ref="APPLICATION"/>
        
        <appender-ref ref="WARN"/>
        
        <appender-ref ref="ERROR"/>
    root>

configuration>

第三步、追加日志到service的appender中

这里我们不能直接将SERVICE加到root标签下，要使用另外一个标签logger，该标签继承了root，是子logger。该标签有一个additivity属性，若是additivity设为true，则子logger不止会在自己的appender里输出，还会在root的logger的appender里输出；若是additivity设为false，则子logger只会在自己的appender里输出，不会在root的logger的appender里输出

<configuration>
    
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
    
    <property name="APP_NAME" value="logback-test"/>
    
    <property name="LOG_PATH" value="${user.home}/logs/${APP_NAME}"/>
    
    <property name="LOG_FILE" value="${LOG_PATH}/application.log"/>
    
    <property name="WARN_LOG_FILE" value="${LOG_PATH}/warn.log"/>
    
    <property name="ERROR_LOG_FILE" value="${LOG_PATH}/error.log"/>
    
    <property name="SERVICE_LOG_FILE" value="${LOG_PATH}/service.log"/>

    
    <appender name="APPLICATION"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        
        <file>${LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_FILE}.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>

    
    <appender name="WARN" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${WARN_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/warn.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>WARNlevel>
        filter>
    appender>

    
    <appender name="ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${ERROR_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/error.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>ERRORlevel>
        filter>
    appender>

    
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
    appender>

    
    <appender name="SERVICE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${SERVICE_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/service.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>

    
    
    <logger name="com.example.logback.service" level="INFO" additivity="true">
        <appender-ref ref="SERVICE"/>
    logger>

    
    <root level="INFO">
        
        <appender-ref ref="CONSOLE"/>
        
        <appender-ref ref="APPLICATION"/>
        
        <appender-ref ref="WARN"/>
        
        <appender-ref ref="ERROR"/>
    root>
configuration>

启动只有又会多一个service.log，如下

 

2、切面日志打印

可能有些同学不知道这个是啥，这里我举个场景，就好理解了。

假设现在的项目结构如下，增加了一个HttpAspect切面类，作用是监控controller中每个方法的入参、出参、接口耗时等信息，这个功能相信大家都做过。

HttpAspect代码如下

package com.example.logback.config;

import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

@Slf4j
@Aspect
@Component
public class HttpAspect {

    @Pointcut("execution(* com.example.logback.controller..*.*(..))")
    public void pointCut() {

    }

    @Around(value = "pointCut()")
    public Object doAround(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {

        // 获取目标参数
        String serviceUniqueName = proceedingJoinPoint.getSignature().getDeclaringTypeName();
        String methodName = proceedingJoinPoint.getSignature().getName();
        long start = System.currentTimeMillis();
        Object proceed = proceedingJoinPoint.proceed();
        log.info("@Http:{}.{},耗时:{}ms", serviceUniqueName, methodName,
            System.currentTimeMillis() - start);
        return proceed;
    }
}

相信细心的同学已经发现问题了，controller目录下的类里面是没有打印的，log都在config目录下的HttpAspect中，显然指定打印目录为controller是不行的。

那如果指定目录为config呢？如果这个目录下只有一个HttpAspect类是可以的，但如果该目录下还有其他配置类，那这个办法就不太好用了。

这时我们就需要通过指定类的方式进行打印。

那怎么指定类进行打印呢？我们常用的@Slf4j注解里面有一个属性topic

@Retention(RetentionPolicy.SOURCE)
@Target(ElementType.TYPE)
public @interface Slf4j {
    /** @return The category of the constructed Logger. By default, it will use the type where the annotation is placed. */
    String topic() default "";
}

定义方式也很简单，如下

这个topic定义之后，和logger中的name属性对上之后，那么这个logger就只会打印这个类的日志！！！

第一步、指定类定义topic

package com.example.logback.config;

import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

@Slf4j(topic = "http-log")
@Aspect
@Component
public class HttpAspect {

    @Pointcut("execution(* com.example.logback.controller..*.*(..))")
    public void pointCut() {

    }

    @Around(value = "pointCut()")
    public Object doAround(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {

        // 获取目标参数
        String serviceUniqueName = proceedingJoinPoint.getSignature().getDeclaringTypeName();
        String methodName = proceedingJoinPoint.getSignature().getName();
        long start = System.currentTimeMillis();
        Object proceed = proceedingJoinPoint.proceed();
        log.info("@Http:{}.{},耗时:{}ms", serviceUniqueName, methodName,
            System.currentTimeMillis() - start);
        return proceed;
    }
}

第二步、定义指定类topic的日志文件输出路径 

<configuration>
    
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
    
    <property name="APP_NAME" value="logback-test"/>
    
    <property name="LOG_PATH" value="${user.home}/logs/${APP_NAME}"/>
    
    <property name="LOG_FILE" value="${LOG_PATH}/application.log"/>
    
    <property name="WARN_LOG_FILE" value="${LOG_PATH}/warn.log"/>
    
    <property name="ERROR_LOG_FILE" value="${LOG_PATH}/error.log"/>
    
    <property name="SERVICE_LOG_FILE" value="${LOG_PATH}/service.log"/>
    
    <property name="HTTP_PACKAGE_LOG_FILE" value="${LOG_PATH}/http-package.log"/>
    
    <property name="HTTP_TOPIC_LOG_FILE" value="${LOG_PATH}/http-topic.log"/>

    
    <appender name="APPLICATION"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        
        <file>${LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_FILE}.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>

    
    <appender name="WARN" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${WARN_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/warn.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>WARNlevel>
        filter>
    appender>

    
    <appender name="ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${ERROR_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/error.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>ERRORlevel>
        filter>
    appender>

    
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
    appender>

    
    <appender name="SERVICE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${SERVICE_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/service.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>

    
    <appender name="HTTP-PACKAGE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${HTTP_PACKAGE_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/http-package.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>

    
    
    <logger name="com.example.logback.service" level="INFO" additivity="true">
        <appender-ref ref="SERVICE"/>
    logger>

    
    
    <logger name="com.example.logback.config" level="INFO" additivity="false">
        <appender-ref ref="HTTP-PACKAGE"/>
    logger>

    
    <root level="INFO">
        
        <appender-ref ref="CONSOLE"/>
        
        <appender-ref ref="APPLICATION"/>
        
        <appender-ref ref="WARN"/>
        
        <appender-ref ref="ERROR"/>
    root>
configuration> 

第三步、定义指定类topic的appender

<configuration>
    
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
    
    <property name="APP_NAME" value="logback-test"/>
    
    <property name="LOG_PATH" value="${user.home}/logs/${APP_NAME}"/>
    
    <property name="LOG_FILE" value="${LOG_PATH}/application.log"/>
    
    <property name="WARN_LOG_FILE" value="${LOG_PATH}/warn.log"/>
    
    <property name="ERROR_LOG_FILE" value="${LOG_PATH}/error.log"/>
    
    <property name="SERVICE_LOG_FILE" value="${LOG_PATH}/service.log"/>
    
    <property name="HTTP_PACKAGE_LOG_FILE" value="${LOG_PATH}/http-package.log"/>
    
    <property name="HTTP_TOPIC_LOG_FILE" value="${LOG_PATH}/http-topic.log"/>

    
    <appender name="APPLICATION"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        
        <file>${LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_FILE}.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>

    
    <appender name="WARN" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${WARN_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/warn.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>WARNlevel>
        filter>
    appender>

    
    <appender name="ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${ERROR_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/error.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>ERRORlevel>
        filter>
    appender>

    
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
    appender>

    
    <appender name="SERVICE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${SERVICE_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/service.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>

    
    <appender name="HTTP-PACKAGE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${HTTP_PACKAGE_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/http-package.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>

    
    <appender name="HTTP-TOPIC" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${HTTP_TOPIC_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/http-topic.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>

    
    
    <logger name="com.example.logback.service" level="INFO" additivity="true">
        <appender-ref ref="SERVICE"/>
    logger>

    
    
    <logger name="com.example.logback.config" level="INFO" additivity="false">
        <appender-ref ref="HTTP-PACKAGE"/>
    logger>

    
    <root level="INFO">
        
        <appender-ref ref="CONSOLE"/>
        
        <appender-ref ref="APPLICATION"/>
        
        <appender-ref ref="WARN"/>
        
        <appender-ref ref="ERROR"/>
    root>
configuration>

第四步、追加日志到指定类topic的appender中

<configuration>
    
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
    
    <property name="APP_NAME" value="logback-test"/>
    
    <property name="LOG_PATH" value="${user.home}/logs/${APP_NAME}"/>
    
    <property name="LOG_FILE" value="${LOG_PATH}/application.log"/>
    
    <property name="WARN_LOG_FILE" value="${LOG_PATH}/warn.log"/>
    
    <property name="ERROR_LOG_FILE" value="${LOG_PATH}/error.log"/>
    
    <property name="SERVICE_LOG_FILE" value="${LOG_PATH}/service.log"/>
    
    <property name="HTTP_PACKAGE_LOG_FILE" value="${LOG_PATH}/http-package.log"/>
    
    <property name="HTTP_TOPIC_LOG_FILE" value="${LOG_PATH}/http-topic.log"/>

    
    <appender name="APPLICATION"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        
        <file>${LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_FILE}.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>

    
    <appender name="WARN" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${WARN_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/warn.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>WARNlevel>
        filter>
    appender>

    
    <appender name="ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${ERROR_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/error.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
        
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>ERRORlevel>
        filter>
    appender>

    
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
    appender>

    
    <appender name="SERVICE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${SERVICE_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/service.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>

    
    <appender name="HTTP-PACKAGE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${HTTP_PACKAGE_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/http-package.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>

    
    <appender name="HTTP-TOPIC" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${HTTP_TOPIC_LOG_FILE}file>
        <encoder>
            
            <pattern>${CONSOLE_LOG_PATTERN}pattern>
            <charset>utf8charset>
        encoder>
        
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            
            <fileNamePattern>${LOG_PATH}/http-topic.%d{yyyy-MM-dd}.%i.logfileNamePattern>
            
            <maxHistory>7maxHistory>
            
            <maxFileSize>50MBmaxFileSize>
            
            <totalSizeCap>500MBtotalSizeCap>
        rollingPolicy>
    appender>

    
    
    <logger name="com.example.logback.service" level="INFO" additivity="true">
        <appender-ref ref="SERVICE"/>
    logger>

    
    
    <logger name="com.example.logback.config" level="INFO" additivity="false">
        <appender-ref ref="HTTP-PACKAGE"/>
    logger>

    
    
    <logger name="http-log" level="INFO" additivity="false">
        <appender-ref ref="HTTP-TOPIC"/>
    logger>


    
    <root level="INFO">
        
        <appender-ref ref="CONSOLE"/>
        
        <appender-ref ref="APPLICATION"/>
        
        <appender-ref ref="WARN"/>
        
        <appender-ref ref="ERROR"/>
    root>
configuration>

 日志目录中多了一个文件，http-topic，如下

 

五、写在最后

这篇文章篇幅比较长，主要是配置文件贴的比较多，我本来是想每一步只贴关键代码的，但成文之后看起来有点费劲，所以每一步都贴了全量的配置。xml文件我觉得是比较难阅读的一种文档，里面的标签又多又乱，没有顺序可言。如果不是从第一个标签开始看，根本不知道标签之间的依赖关系，为了方便大家阅读，我用了这种颜色表示新增的配置，这种颜色表示有关联的配置，无色表示无关配置。不过我也不知道这种办法能不能提高阅读体验，如果大家有好的想法也可以评论提出来，在此表示感谢！

作者：不若为止
欢迎任何形式的转载，但请务必注明出处。
限于本人水平，如果文章和代码有表述不当之处，还请不吝赐教。