功能如标题，代码如下

MyRollingFileAppender

package com.source.util;

import org.apache.log4j.Layout;
import org.apache.log4j.Priority;
import org.apache.log4j.RollingFileAppender;
import org.apache.log4j.helpers.CountingQuietWriter;
import org.apache.log4j.spi.LoggingEvent;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.util.Date;

/**
 * 修改log的生成策略(一天一个目录,每次重启日志文件切换新的)
 *
 * @author source
 */
@SuppressWarnings("Duplicates")
public class MyRollingFileAppender extends RollingFileAppender {
    private LocalDate localDate = null;
    private String parternFileName = null;

    /**
     * 默认的无参构造
     */
    public MyRollingFileAppender() {
        super();
    }

    /**
     * 三参构造
     */
    public MyRollingFileAppender(Layout layout, String filename, boolean append) throws IOException {
        super(layout, filename, append);
        parternFileName = filename;
    }

    /**
     * 二参构造(append->true)
     */
    public MyRollingFileAppender(Layout layout, String filename) throws IOException {
        super(layout, filename);
    }

    /**
     * 修改fileName方法在截断生成新文件前调用
     */
    @Override
    public void setFile(String file) {
        if (parternFileName == null) {
            parternFileName = file;
        }
        super.fileName = DatePatternParser.parse(new StringBuilder(parternFileName));
    }

    /**
     * 当前日志输出行只输出到对应的日志等级文件(不做向下兼容)
     */
    @Override
    public boolean isAsSevereAsThreshold(Priority priority) {
        return this.getThreshold().equals(priority);
    }


    /**
     * 修改日志策略主要逻辑
     */
    @Override
    protected void subAppend(LoggingEvent event) {
        boolean rollOver = false;
        //重启且有日志生成新文件
        if (localDate == null) {
            localDate = LocalDate.now();
            if (new File(fileName).length() > 0) {
                rollOver = true;
            }
        }

        if (fileName != null && qw != null) {
            long size = ((CountingQuietWriter) qw).getCount();
            long nextRollover = 0;
            //添加日期判断,确保变更日期触发日志截断
            boolean flag = (size >= maxFileSize && size >= nextRollover) || !LocalDate.now().equals(localDate);
            if (flag) {
                localDate = LocalDate.now();
                rollOver = true;
            }
        }
        //如果存在换文件操作,就在换完文件后再输出日志
        if (rollOver) {
            setFile(parternFileName);
            rollOver();
        }
        super.subAppend(event);
    }


    /**
     * 路径带时间字符串格式化
     */
    static class DatePatternParser {
        static final String HEAD = "%d";

        static String parse(StringBuilder str) {
            while (str.indexOf(HEAD) > 0) {
                int index = str.indexOf(HEAD);
                int indexEnd = str.indexOf("}", index) + 1;
                int indexStart = str.indexOf("{", index);
                String p = str.substring(indexStart + 1, indexEnd - 1);
                SimpleDateFormat sdf = new SimpleDateFormat(p);
                str.replace(index, indexEnd, sdf.format(new Date()));
            }
            return str.toString().trim();
        }
    }
}

log4j.properties

# DEBUG < INFO < WARN < ERROR < FATAL
#log4j.rootLogger=ALL,debug,console,info,warn,error

logDir=./logs/jfinal-test
log4j.rootLogger=ALL,console,debug,info,warn,error

log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss}|%t|%c|%p|%m%n
log4j.appender.console.Threshold = debug

log4j.logger.debug=debug
log4j.appender.debug=com.source.util.MyRollingFileAppender
log4j.appender.debug.layout=org.apache.log4j.PatternLayout
log4j.appender.debug.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss}|%p|%m%n
log4j.appender.debug.Threshold = DEBUG
log4j.appender.debug.File=${logDir}/%d{yyyy-MM}/%d{dd}/debug/debug.log
log4j.appender.debug.MaxFileSize=10MB
log4j.appender.debug.MaxBackupIndex=10
log4j.appender.debug.Encoding =UTF-8

log4j.logger.info=info
log4j.appender.info=com.source.util.MyRollingFileAppender
log4j.appender.info.layout=org.apache.log4j.PatternLayout
log4j.appender.info.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss}|%p|%m%n
log4j.appender.info.Threshold = INFO
log4j.appender.info.File=${logDir}/%d{yyyy-MM}/%d{dd}/info/info.log
log4j.appender.info.MaxFileSize=10MB
log4j.appender.info.MaxBackupIndex=10
log4j.appender.info.Encoding =UTF-8

log4j.logger.warn=warn
log4j.appender.warn=com.source.util.MyRollingFileAppender
log4j.appender.warn.layout=org.apache.log4j.PatternLayout
log4j.appender.warn.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss}|%p|%m%n
log4j.appender.warn.Threshold = WARN
log4j.appender.warn.File=${logDir}/%d{yyyy-MM}/%d{dd}/warn/warn.log
log4j.appender.warn.MaxFileSize=10MB
log4j.appender.warn.MaxBackupIndex=10
log4j.appender.warn.Encoding =UTF-8

log4j.logger.error=error
log4j.appender.error=com.source.util.MyRollingFileAppender
log4j.appender.error.layout=org.apache.log4j.PatternLayout
log4j.appender.error.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss}|%p|%m%n
log4j.appender.error.Threshold = ERROR
log4j.appender.error.File=${logDir}/%d{yyyy-MM}/%d{dd}/error/error.log
log4j.appender.error.MaxFileSize=10MB
log4j.appender.error.MaxBackupIndex=10
log4j.appender.error.Encoding =UTF-8