slf4j日志使用

scala中

trait LogSupport {
  protected val log = LoggerFactory.getLogger(this.getClass)
}

需要要到的类 extends LogSupport即可

public class BootTest {

    public static void main(String args[]){
        Logger log = LoggerFactory.getLogger(BootTest.class);
        log.info("BootTest"); //打印日志
    }

}

java中非静态的使用：

private Logger log = LoggerFactory.getLogger(this.getClass());//传入的参数this.getClass() 影响打印信息%logger{35} 例如： c.z.b.v.a.l.k.test.LogTest

logback.xml典型配置：

<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="true" scanPeriod="60 seconds" debug="true">
    <!-- 定义日志文件 输入位置 -->
    <property name="log_dir" value="./log" />
    <!-- 日志最大的历史 7天 -->
    <property name="maxHistory" value="7"/>

    <!-- definition of appender STDOUT -->
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} +[%thread] %-5level - %msg%n</pattern>
          <!--  <charset class="java.nio.charset.Charset">UTF-8</charset>   这样？-->
　　　　　　　<charset>UTF-8</charset> <!-- 防止乱码，设置字符集 -->
        </encoder>
    </appender>

    <appender name="FILE_WARN" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>WARN</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>

        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${log_dir}/%d{yyyy-MM-dd}/test.warn.log</fileNamePattern>
            <maxHistory>${maxHistory}</maxHistory>
        </rollingPolicy>

        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS}-4relative [%thread] %-5level %logger{35} - %msg%n</pattern>
        </encoder>
    </appender>

    <appender name="FILE_INFO" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>INFO</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>

        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${log_dir}/%d{yyyy-MM-dd}/test.info.log</fileNamePattern>
            <maxHistory>${maxHistory}</maxHistory>
        </rollingPolicy>

        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS}-4relative [%thread] %-5level %logger{35} - %msg%n</pattern>
        </encoder>
    </appender>

    <appender name="FILE_DEBUG" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>DEBUG</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>

        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${log_dir}/%d{yyyy-MM-dd}/test.debug.log</fileNamePattern>
            <maxHistory>${maxHistory}</maxHistory>
        </rollingPolicy>

        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS}-4relative [%thread] %-5level %logger{35} - %msg%n</pattern>
        </encoder>
    </appender>

    <appender name="FILE_ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>ERROR</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>

        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${log_dir}/%d{yyyy-MM-dd}/test.error.log</fileNamePattern>
            <maxHistory>${maxHistory}</maxHistory>
        </rollingPolicy>

        <encoder>
            <!--%d{yyyy-MM-dd HH:mm:ss.SSS}%-4relative [%thread] %-5level %logger{35} - -->
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS}-4relative [%thread] %-5level %logger{35} - %msg%n</pattern>
        </encoder>
    </appender>

    <root level="INFO">
        <!-- appender referenced after it is defined -->
        <appender-ref ref="STDOUT"/>
        <appender-ref ref="FILE_ERROR"/>
        <appender-ref ref="FILE_WARN"/>
        <appender-ref ref="FILE_INFO"/>
        <appender-ref ref="FILE_DEBUG"/>
    </root>
</configuration>

参考：https://my.oschina.net/u/1428349/blog/341826 《logback中文乱码问题》

https://logback.qos.ch/manual/appenders.html  logback官方文档《Chapter 4: Appenders》