一、logback介绍

Logback是由log4j创始人设计的另一个开源日志组件,官方网站： logback.qos.ch。它当前分为以下三个模块：

• logback-core：其它两个模块的基础模块。

• logback-classic：它是log4j的一个改良版本，同时它完整实现了slf4j API使你可以很方便地更换成其它日志系统如log4j或JDK14 Logging。

• logback-access：访问模块与Servlet容器集成提供通过Http来访问日志的功能。

默认情况下，Spring Boot会用Logback来记录日志，并用INFO级别输出到控制台。

二、代码工程

实验目标：实现springboot应用打印彩色日志

pom.xml

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springboot-demo</artifactId>
        <groupId>com.et</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>


    <artifactId>logback</artifactId>


    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>


        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>


        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-autoconfigure</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.20</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>
</project>

application.yaml

server:
  port: 8088
logging:
  config: classpath:logback-spring.xml

logback-spring.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <property name="LOG_PATH" value="logs" />
    <property name="LOG_PATTERN" value="%d{yyyy-MM-dd HH:mm:ss.SSS} [%-5level] %-40.40logger{39} : %msg%n" />


    <!-- 控制台输出 -->
    <appender name="consoleLog" class="ch.qos.logback.core.ConsoleAppender">
        <!-- 彩色日志 -->
        <layout class="ch.qos.logback.classic.PatternLayout">
            <pattern>
                %d{yyyy-MM-dd HH:mm:ss} [%thread] %magenta(%-5level) %green([%-50.50class]) >>> %cyan(%msg) %n
            </pattern>
        </layout>
    </appender>


    <!-- 按照每天生成日志文件 -->
    <appender name="fileLog"  class="ch.qos.logback.core.rolling.RollingFileAppender">
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!--日志文件输出的文件名-->
            <FileNamePattern>${LOG_PATH}/cms.%d{yyyy-MM-dd}.%i.log</FileNamePattern>
            <!--日志文件最大的大小-->
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>100MB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
            <!--日志文件保留天数-->
            <MaxHistory>30</MaxHistory>
        </rollingPolicy>
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <pattern>${LOG_PATTERN}</pattern>
        </encoder>
    </appender>


    <!-- 日志输出级别 -->
    <root level="info">
        <appender-ref ref="consoleLog" />
        <appender-ref ref="fileLog" />
    </root>


</configuration>

comtroller

package com.et.logback.controller;


import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;


import java.util.HashMap;
import java.util.Map;


@Controller
@Slf4j
public class HelloWorldController {
    @RequestMapping("/hello")
    @ResponseBody
    public Map<String, Object> showHelloWorld(){
        log.info("info日志");
        Map<String, Object> map = new HashMap<>();
        map.put("msg", "HelloWorld");
        return map;
    }
}

代码仓库

• https://github.com/Harries/springboot-demo

三、测试

启动springboot应用，查看控制台日志，打印彩色日志。如下图所示：

四、引用

• https://logback.qos.ch/manual/layouts.html#coloring

• http://www.liuhaihua.cn/archives/710275.html

• https://blog.csdn.net/qq_41107231/article/details/117573372