Spring Boot 日志设计结构

https://www.bilibili.com/video/BV1iJ411H74S?p=36

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">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <artifactId>spring-boot-starter-parent</artifactId>
        <groupId>org.springframework.boot</groupId>
        <version>2.2.2.RELEASE</version>
    </parent>

    <groupId>io.github.jihch</groupId>
    <artifactId>spring-boot-log</artifactId>
    <version>1.0-SNAPSHOT</version>

    <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-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

</project>

依赖关系图

	spring-boot-starter-web
	spring-boot-starter
	spring-boot-starter-logging
	jul-to-slf4j	log4j-to-slf4j	logback-classic
日志门面	slf4j-api
日志实现	JUL	Log4j	Logback

总结

1. Spring Boot 底层默认使用 Logback 作为日志实现
2. 使用了 SLF4J 作为日志门面
3. 将 JUL 也转换成 SLF4J
4. 也可以使用 Log4j 2 作为日志门面，但是最终也是通过 SLF4J 调用 Logback