Date lookup and converter in RollingFile Appender

[JRU1]

Description

0点日志归档到错误目录下

Configuration

Version: 2.20.0

Operating system: Windows10

JDK: JDK17

1. Log4j2.xml 配置

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="INFO" monitorInterval="600">

    <properties>
        <property name="MODULE_NAME">${spring:spring.application.name}</property>
        <property name="LOG_HOME">/logs</property>
        <property name="LOG_CHARSET">UTF-8</property>
        <property name="STDOUT_PATTERN">|%clr{%d{yyyy-MM-dd HH:mm:ss.SSS}}{faint}|%clr{%5p}|%5t|%clr{%l}{cyan}|${MODULE_NAME}|%clr{%marker}{magenta}|%m%n</property>
        <property name="FILE_PATTERN">|%d{yyyy-MM-dd HH:mm:ss.SSS}|%5p|%5t|%l|${MODULE_NAME}|%marker|%m%n</property>
    </properties>

    <Appenders>
        <Console name="STDOUT">
            <PatternLayout pattern="${STDOUT_PATTERN}"/>
        </Console>

        <RollingRandomAccessFile name="FILE"
                                 filename="${env:LOG_PATH:-${LOG_HOME}/${MODULE_NAME}}/${MODULE_NAME}.log"
                                 filepattern="${env:LOG_PATH:-${LOG_HOME}/${MODULE_NAME}}/$${date:yyyy-MM-dd-HH}/${MODULE_NAME}.log.%d{yyyy-MM-dd-HH}-%03i.log">
            <PatternLayout pattern="${FILE_PATTERN}"/>
            <Policies>
                <TimeBasedTriggeringPolicy modulate="true" interval="2"/>
                <SizeBasedTriggeringPolicy size="5MB"/>
            </Policies>
            <DefaultRolloverStrategy max="1000"/>
        </RollingRandomAccessFile>
    </Appenders>

    <Loggers>
        <AsyncLogger name="STDOUT" additivity="false" level="INFO" includeLocation="true">
            <AppenderRef ref="STDOUT"/>
            <AppenderRef ref="FILE"/>
        </AsyncLogger>

        <AsyncLogger name="FILE" additivity="false" level="INFO" includeLocation="true">
            <AppenderRef ref="FILE" />
            <AppenderRef ref="STDOUT"/>
        </AsyncLogger>

        <AsyncRoot level="INFO" includeLocation="true">
            <AppenderRef ref="FILE"/>
            <AppenderRef ref="STDOUT"/>
        </AsyncRoot>
    </Loggers>

</Configuration>

2. 日志归档结果

[ppkarwasz]

There is an essential difference between the $${date:...} lookup and %d{...} pattern:

• the $${date:...} lookup formats the current timestamp. In your case the timestamp was 2024-08-02 00:00:00.
• the %d{...} lookup formats the timestamp of the previous rollover. In your case the timestamp was 2024-08-01 23:00:00.

If you want the name of the log file and folder to match, use only %d patterns:

<RollingRandomAccessFile name="FILE"
                         filename="${env:LOG_PATH:-${LOG_HOME}/${MODULE_NAME}}/${MODULE_NAME}.log"
                         filepattern="${env:LOG_PATH:-${LOG_HOME}/${MODULE_NAME}}/%d{yyyy-MM-dd}/${MODULE_NAME}.log.%d{yyyy-MM-dd-HH}-%03i.log">
  ...
</RollingRandomAccessFile>

Mixing %d{...} patterns and $${date:...} lookups is a common problem, so I added a note to our documentation (see Conversion patterns).
We will published the improved documentation on our production site soon.

[ppkarwasz]

Remark: the default fallback for ${env:LOG_PATH} is ${LOG_PATH}, so you can simplify your configuration by renaming your LOG_HOME property to LOG_PATH

<Property name="LOG_PATH" value="/logs"/>

After this change you can write ${env:LOG_PATH} instead of ${env:LOG_PATH:-${LOG_HOME}}.

[JRU1]

Ok! Thanks.

[JRU1]

Ok! Thanks.