同样是logback1.11，更换了log配置后，无论是否有线程持续不断写入log文件，log文件会按设定以日期序号轮换

上次发现了logback1.11的一个bug，即有线程持续写入log，则log文件不会按设定模式进行轮换。

但发现同样采用logback1.11的另外一个工程，它的日志文件就没有错误，于是参照其配置文件将logback.xml设定如下：

<?xml version="1.0" encoding="UTF-8"?>
<configuration debug="false">
    <!-- Where are log files -->
    <property name="LOG_HOME" value="d:/logs" />

    <!-- Output to Console -->
    <appender name="STDOUT"
        class="ch.qos.logback.core.ConsoleAppender">
        <encoder
            class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <!--%d:date，%thread:thread，%-5level：error/debug/info... %msg：message，%n:new line -->
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} -%msg%n</pattern>
        </encoder>
    </appender>

    <!-- Output to File -->
    <appender name="FILE"
        class="ch.qos.logback.core.rolling.RollingFileAppender">

        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            <fileNamePattern>${LOG_HOME}/logbackCfg3new.%d{yyyy-MM-dd}.%i.log</fileNamePattern>
            <maxFileSize>10KB</maxFileSize>
            <MaxHistory>60</MaxHistory>
        </rollingPolicy>

        <encoder
            class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <!--%d:date，%thread:thread，%-5level：error/debug/info... %msg：message，%n:new line -->
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} -%msg%n</pattern>
        </encoder>
    </appender>

    <!-- log level TRACE, DEBUG, INFO, WARN, ERROR, ALL and OFF,default：DEBUG。-->
    <root level="ALL">
        <appender-ref ref="STDOUT" /> <!-- show log on console -->
        <appender-ref ref="FILE" /> <!-- show log in file -->
    </root>
</configuration>

上面蓝字部分整段替换掉了原有的appender，而红色部分是关键所在。

然后，依然启动三个线程写log：

线程一：

package logbackCfg;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class App {
    private final static Logger logger = LoggerFactory.getLogger(App.class);

    public static void main(String[] args) throws InterruptedException {

        while(true) {
            Thread.sleep(5000);
            logger.info("秦时明月汉时关");
            logger.error("万里长征人未还");
            logger.debug("但使龙城飞将在");
            logger.trace("不教胡马度阴山");
        }
    }
}

线程二：

package logbackCfg;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class App2 {
    private final static Logger logger = LoggerFactory.getLogger(App2.class);

    public static void main(String[] args) throws InterruptedException {
        while(true) {
            Thread.sleep(8000);
            logger.info("九里山前作战场");
            logger.error("牧童拾得旧刀枪");
            logger.debug("微风吹皱乌江水");
            logger.trace("恰似虞姬别霸王");
        }
    }
}

线程3：

package logbackCfg;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class NewDayThread {
    private final static Logger logger = LoggerFactory.getLogger(NewDayThread.class);

    public static void main(String[] args) throws InterruptedException {

        while(true) {
            Date currentTime = new Date();

            if(currentTime.compareTo(fixedDate())>0) {
                Thread.sleep(8000);
                logger.info("万里赴戎机，关山度若飞。");
                logger.error("朔气传金柝，寒光照铁衣。");
                logger.debug("将军百战死，壮士十年归。");
            }
        }
    }

    private static Date fixedDate() {
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        try {
            return formatter.parse("2020-01-17 13:10:00");
        } catch (ParseException e) {
            return new Date();
        }
    }
}

然后到目录中查看，发现没有发生因线程持续写log而导致文件不发生轮换的事情：

这样，1.11版本的bug就被绕过去了，只是修改logback配置文件的事情，可以说以最小代价达成了目的。

代码下载：https://files.cnblogs.com/files/xiandedanteng/logbackCfg3_20200117_2.zip

--END-- 2020-01-17 14:48

2020-01-21补记，下面的xml工作得正常：

<?xml version="1.0" encoding="UTF-8"?>
<configuration debug="false">
    <!-- Where are log files -->
    <property name="LOG_HOME" value="d:/logs" />

    <!-- Output to Console -->
    <appender name="STDOUT"
        class="ch.qos.logback.core.ConsoleAppender">
        <encoder
            class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <!--%d:date，%thread:thread，%-5level：error/debug/info... %msg：message，%n:new line -->
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} -%msg%n</pattern>
        </encoder>
    </appender>

    <!-- Output to File -->
    <appender name="FILE"
        class="ch.qos.logback.core.rolling.RollingFileAppender">

        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            <fileNamePattern>${LOG_HOME}/logbackCfg3new.%d{yyyy-MM-dd}.%i.log</fileNamePattern>
            <maxFileSize>1MB</maxFileSize>
            <MaxHistory>60</MaxHistory>
        </rollingPolicy>

        <encoder
            class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <!--%d:date，%thread:thread，%-5level：error/debug/info... %msg：message，%n:new line -->
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} -%msg%n</pattern>
        </encoder>
    </appender>

    <!-- log level TRACE, DEBUG, INFO, WARN, ERROR, ALL and OFF,default：DEBUG。-->
    <root level="ALL">
        <appender-ref ref="STDOUT" /> <!-- show log on console -->
        <appender-ref ref="FILE" /> <!-- show log in file -->
    </root>
</configuration>