java123999 java123999 - 7 months ago 24
Java Question

Adding timestamp to a log file using Logback-test.xml

Currently my Spring-boot application logs to a file named:

myLog.log
, this is working as intended, however I would like the log file to have a
timestamp
at the end of it and create a new file each time it is ran.

I have tried to implement this in my
logback-test.xml
file shown below, but it is just giving me the filename: myLog.log without a timestamp.

How can I fix this?

Logback-test.xml:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<include resource="org/springframework/boot/logging/logback/base.xml"/>

<logger name="org.springframework.web" level="INFO"/>

<!-- Send debug messages to System.out -->
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<!-- By default, encoders are assigned the type ch.qos.logback.classic.encoder.PatternLayoutEncoder -->
<encoder>
<pattern>%d{HH:mm:ss.SSS} - %msg%n</pattern>
</encoder>
</appender>

<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>path/to/my/file/mylog.log</file>
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
<Pattern>%d{yyyy-MM-dd_HH:mm:ss.SSS} - %msg%n</Pattern>
</encoder>

<rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
<FileNamePattern>mylog.%i{yyyy-MM-dd_HH:mm:ss.SSS}}.log</FileNamePattern>
<MinIndex>1</MinIndex>
<MaxIndex>10</MaxIndex>
</rollingPolicy>

<triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
<MaxFileSize>2MB</MaxFileSize>
</triggeringPolicy>
</appender>

<logger name="com.my.package" level="INFO" additivity="false">
<appender-ref ref="STDOUT" />
<appender-ref ref="FILE" />
</logger>

<!-- By default, the level of the root level is set to DEBUG -->
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>

</configuration>

Answer

You can define a variable like this:

<timestamp key="myTimestamp" datePattern="yyyy-MM-dd'_'HH-mm-ss.SSS"/>

(note: don't use colons in datePattern)

Then use it directly in your appender's file element:

 <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>path/to/my/file/mylog-${myTimestamp}.log</file>
 ...
 </appender>

Or in a simple FileAppender:

<appender name="FILE" class="ch.qos.logback.core.FileAppender">
    <file>path/to/my/file/mylog-${timestamp}.log</file>
    <encoder>
        <Pattern>%d{yyyy-MM-dd_HH:mm:ss.SSS} - %msg%n</Pattern>
    </encoder>
</appender>