dependencies {
    testCompile group: 'junit', name: 'junit', version: '4.12'
    compile group: 'org.slf4j', name: 'slf4j-api', version: '1.7.25'
    testCompile group: 'org.slf4j', name: 'slf4j-log4j12', version: '1.7.25'
    //testCompile group: 'org.slf4j', name: 'slf4j-simple', version: '1.7.25'
    compile group: 'log4j', name: 'log4j', version: '1.2.17'
    //compile 'org.slf4j:slf4j-nop:1.7.25'  这个玩意就是slf4j 没有指定具体日志实现得时候用的,用上了就是不报错了。
    compile group: 'org.apache.logging.log4j', name: 'log4j-slf4j-impl', version: '2.8.2'
    compile group: 'org.apache.logging.log4j', name: 'log4j-core', version: '2.8.2'
}