#### 将你想使用的实现类配置在第一个，下面 slf4j-simple 配置都在 logback-classic 前面，使用的就是 slf4j-simple

```

dependencies {
testCompile group: 'junit', name: 'junit', version: '4.12'
compile group: 'org.slf4j', name: 'slf4j-api', version: '1.7.28'
compile group: 'org.slf4j', name: 'slf4j-simple', version: '1.7.28'
compile group: 'ch.qos.logback', name: 'logback-classic', version: '1.2.3'
}



public static void main(String[] args) throws IOException {
Logger log = LoggerFactory.getLogger(Test.class);
log.info("info");
}

```