Logback

 Logback在maven中的依赖，去阿里云maven仓库查询出Logback版本目前到了可使用1.2.3版本

<!-- logback+slf4j -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.7.21</version>
    <type>jar</type>
    <scope>compile</scope>
</dependency>
<dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-core</artifactId>
    <version>1.2.3</version>
    <type>jar</type>
</dependency>
<dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-classic</artifactId>
    <version>1.2.3</version>
    <type>jar</type>
</dependency>