springboot会自动帮我们读取logback的配置文件，我们实现只需要添加即可
在application中配置日志文件的位置
logging: config: classpath:conf/logback-dev.xml配置文件的内容如下：
<?xml version="1.0" encoding="UTF-8" ?> <configuration> <appender name="consoleLog" class="ch.qos.logback.core.ConsoleAppender"> <layout class="ch.qos.logback.classic.PatternLayout"> <pattern> %d - %msg%n </pattern> </layout> </appender> <!--每天生成日志的类--> <appender name="fileInfoLog" class="ch.qos.logback.core.rolling.RollingFileAppender"> <filter class="ch.qos.logback.classic.filter.LevelFilter"> <level>ERROR</level> <!--过滤掉error的级别--> <onMatch>DENY</onMatch> <onMismatch>ACCEPT</onMismatch> </filter> <encoder> <pattern> %msg%n </pattern> </encoder> <!--滚动策略--> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <!--路径--> <fileNamePattern>H:\ele-web\log/info.%d.log</fileNamePattern> </rollingPolicy> </appender> <appender name="fileErrorLog" class="ch.qos.logback.core.rolling.RollingFileAppender"> <filter class="ch.qos.logback.classic.filter.ThresholdFilter"> <level>ERROR</level> <!--//打印error--> </filter> <encoder> <pattern> %msg%n </pattern> </encoder> <!--滚动策略--> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <!--路径--> <fileNamePattern>H:\ele-web\log/error.%d.log</fileNamePattern> </rollingPolicy> </appender> <root level="info"> <appender-ref ref="consoleLog" /> <appender-ref ref="fileInfoLog" /> <appender-ref ref="fileErrorLog" /> </root> </configuration>