我正在尝试配置 log4j 以仅保留指定数量的备份文件或保留不超过某个年龄的文件。最终，我希望时间[每日]基于触发策略并保留30个备份文件或删除30天以前的文件。
在做了一些研究之后，我了解到在使用时间策略时我无法指定备份文件的最大数量但是我遇到了这个问题https://issues.apache.org/jira/browse/LOG4J2-435和此文档片段{{3}描述如何根据文件的年龄和名称模式删除文件。现在我尝试在每分钟创建新备份文件的简单示例中应用此配置，并将自动删除超过3分钟的文件。为此，我使用以下pom创建了简单的maven项目：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>test</groupId>
<artifactId>test</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.5</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>prepare-package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/lib</outputDirectory>
<overWriteReleases>false</overWriteReleases>
<overWriteSnapshots>false</overWriteSnapshots>
<overWriteIfNewer>true</overWriteIfNewer>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>lib/</classpathPrefix>
<mainClass>test.Main</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
</project>
log4j2.xml配置文件：
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="warn" name="MyApp" packages="">
<Appenders>
<RollingFile name="RollingFile" fileName="D:/app.log"
filePattern="D:/app-%d{yyyy-MM-dd-HH-mm-ss}.log">
<PatternLayout>
<Pattern>%d %p %c{1.} [%t] %m%n</Pattern>
</PatternLayout>
<Policies>
<TimeBasedTriggeringPolicy interval="60" modulate="true"/>
<!--<SizeBasedTriggeringPolicy size="250 MB"/>-->
</Policies>
<DefaultRolloverStrategy>
<Delete basePath="D:" maxDepth="1">
<IfFileName glob="app-*.log" />
<IfLastModified age="3m" />
</Delete>
</DefaultRolloverStrategy>
</RollingFile>
</Appenders>
<Loggers>
<Root level="trace">
<AppenderRef ref="RollingFile"/>
</Root>
</Loggers>
</Configuration>
和主要课程：
package test;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
/**
* Created by mzurawski on 2015-12-22.
*/
public class Main {
final static Logger logger = LogManager.getLogger(Main.class);
public static void main(String[] args) {
runMe("test");
}
private static void runMe(String parameterParam){
String parameter;
for(int i=0; i<100; ++i) {
parameter = parameterParam + i;
System.out.println("log iteration: "+i);
if (logger.isDebugEnabled()) {
logger.debug("This is debug : " + parameter);
}
if (logger.isInfoEnabled()) {
logger.info("This is info : " + parameter);
}
logger.warn("This is warn : " + parameter);
logger.error("This is error : " + parameter);
logger.fatal("This is fatal : " + parameter);
try {
Thread.sleep(60000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
构建此程序后，您可以使用以下命令运行它（注意硬编码的光盘位置）：
java -jar test-1.0-SNAPSHOT.jar
到目前为止，每分钟都会创建日志文件，但不会删除任何旧文件。如何使此测试配置生效？我应该如何修改此配置，以便最终只保留过去30天的文件？
感谢您的帮助。
答案 0 :(得分：4)
您的配置和测试程序看起来很好。我测试了你的Main.java和log4j2.xml配置，它按预期工作：触发翻转的每一分钟，删除操作扫描基目录并只删除超过3分钟的文件。
我没有创建一个独立的应用程序，而是在我的IDE中进行了测试。 （看起来你正在将log4j jar文件以及你的类和配置整理到一个jar中。这会导致问题吗？）
通过将配置更改为<Configuration status="TRACE" ...启用log4j内部日志记录后，我得到以下输出：
...（省略启动日志）......
log iteration: 3
2016-01-16 14:26:23,192 main TRACE PatternProcessor.getNextTime returning 2016/01/16-14:27:00.000, nextFileTime=2016/01/16-14:26:59.000, prevFileTime=2016/01/16-14:25:59.000, current=2016/01/16-14:26:23.192, freq=EVERY_SECOND
2016-01-16 14:26:23,193 main TRACE DefaultRolloverStrategy.purge() took 0.0 milliseconds
2016-01-16 14:26:23,194 main DEBUG RollingFileManager executing synchronous FileRenameAction[c:\temp\log\app.log to c:\temp\log\app-2016-01-16-14-25-59.log, renameEmptyFiles=false]
2016-01-16 14:26:23,198 main DEBUG RollingFileManager executing async CompositeAction[DeleteAction[basePath=c:\temp\log, options=[], maxDepth=1, conditions=[IfFileName(glob:app-*.log), IfLastModified(age=PT3M)]]]
2016-01-16 14:26:23,199 Log4j2-2 DEBUG Starting DeleteAction[basePath=c:\temp\log, options=[], maxDepth=1, conditions=[IfFileName(glob:app-*.log), IfLastModified(age=PT3M)]]
2016-01-16 14:26:23,200 Log4j2-2 DEBUG DeleteAction complete in 0.001186309 seconds
2016-01-16 14:26:23,201 Log4j2-2 TRACE Sorted paths:
2016-01-16 14:26:23,201 Log4j2-2 TRACE c:\temp\log\app.log (modified: 2016-01-16T05:26:23.199631Z)
2016-01-16 14:26:23,201 Log4j2-2 TRACE c:\temp\log\app-2016-01-16-14-25-59.log (modified: 2016-01-16T05:25:30.832634Z)
2016-01-16 14:26:23,203 Log4j2-2 TRACE c:\temp\log\app-2016-01-16-14-24-59.log (modified: 2016-01-16T05:25:23.188525Z)
2016-01-16 14:26:23,203 Log4j2-2 TRACE c:\temp\log\app-2016-01-16-14-23-59.log (modified: 2016-01-16T05:23:29.466887Z)
2016-01-16 14:26:23,204 Log4j2-2 TRACE IfFileName REJECTED: 'glob:app-*.log' does not match relative path 'app.log'
2016-01-16 14:26:23,204 Log4j2-2 TRACE Not deleting base=c:\temp\log, relative=app.log
2016-01-16 14:26:23,205 Log4j2-2 TRACE IfFileName ACCEPTED: 'glob:app-*.log' matches relative path 'app-2016-01-16-14-25-59.log'
2016-01-16 14:26:23,205 Log4j2-2 TRACE IfLastModified REJECTED: app-2016-01-16-14-25-59.log ageMillis '52373' < 'PT3M'
2016-01-16 14:26:23,205 Log4j2-2 TRACE Not deleting base=c:\temp\log, relative=app-2016-01-16-14-25-59.log
2016-01-16 14:26:23,206 Log4j2-2 TRACE IfFileName ACCEPTED: 'glob:app-*.log' matches relative path 'app-2016-01-16-14-24-59.log'
2016-01-16 14:26:23,206 Log4j2-2 TRACE IfLastModified REJECTED: app-2016-01-16-14-24-59.log ageMillis '60018' < 'PT3M'
2016-01-16 14:26:23,206 Log4j2-2 TRACE Not deleting base=c:\temp\log, relative=app-2016-01-16-14-24-59.log
2016-01-16 14:26:23,206 Log4j2-2 TRACE IfFileName ACCEPTED: 'glob:app-*.log' matches relative path 'app-2016-01-16-14-23-59.log'
2016-01-16 14:26:23,207 Log4j2-2 TRACE IfLastModified REJECTED: app-2016-01-16-14-23-59.log ageMillis '173740' < 'PT3M'
2016-01-16 14:26:23,207 Log4j2-2 TRACE Not deleting base=c:\temp\log, relative=app-2016-01-16-14-23-59.log
log iteration: 4
2016-01-16 14:27:23,200 main TRACE PatternProcessor.getNextTime returning 2016/01/16-14:28:00.000, nextFileTime=2016/01/16-14:27:59.000, prevFileTime=2016/01/16-14:26:59.000, current=2016/01/16-14:27:23.200, freq=EVERY_SECOND
2016-01-16 14:27:23,201 main TRACE DefaultRolloverStrategy.purge() took 0.0 milliseconds
2016-01-16 14:27:23,202 main DEBUG RollingFileManager executing synchronous FileRenameAction[c:\temp\log\app.log to c:\temp\log\app-2016-01-16-14-26-59.log, renameEmptyFiles=false]
2016-01-16 14:27:23,204 main DEBUG RollingFileManager executing async CompositeAction[DeleteAction[basePath=c:\temp\log, options=[], maxDepth=1, conditions=[IfFileName(glob:app-*.log), IfLastModified(age=PT3M)]]]
2016-01-16 14:27:23,205 Log4j2-3 DEBUG Starting DeleteAction[basePath=c:\temp\log, options=[], maxDepth=1, conditions=[IfFileName(glob:app-*.log), IfLastModified(age=PT3M)]]
2016-01-16 14:27:23,207 Log4j2-3 DEBUG DeleteAction complete in 0.001230382 seconds
2016-01-16 14:27:23,207 Log4j2-3 TRACE Sorted paths:
2016-01-16 14:27:23,207 Log4j2-3 TRACE c:\temp\log\app.log (modified: 2016-01-16T05:27:23.20571Z)
2016-01-16 14:27:23,208 Log4j2-3 TRACE c:\temp\log\app-2016-01-16-14-26-59.log (modified: 2016-01-16T05:26:23.946671Z)
2016-01-16 14:27:23,208 Log4j2-3 TRACE c:\temp\log\app-2016-01-16-14-25-59.log (modified: 2016-01-16T05:25:30.832634Z)
2016-01-16 14:27:23,209 Log4j2-3 TRACE c:\temp\log\app-2016-01-16-14-24-59.log (modified: 2016-01-16T05:25:23.188525Z)
2016-01-16 14:27:23,209 Log4j2-3 TRACE c:\temp\log\app-2016-01-16-14-23-59.log (modified: 2016-01-16T05:23:29.466887Z)
2016-01-16 14:27:23,210 Log4j2-3 TRACE IfFileName REJECTED: 'glob:app-*.log' does not match relative path 'app.log'
2016-01-16 14:27:23,210 Log4j2-3 TRACE Not deleting base=c:\temp\log, relative=app.log
2016-01-16 14:27:23,211 Log4j2-3 TRACE IfFileName ACCEPTED: 'glob:app-*.log' matches relative path 'app-2016-01-16-14-26-59.log'
2016-01-16 14:27:23,211 Log4j2-3 TRACE IfLastModified REJECTED: app-2016-01-16-14-26-59.log ageMillis '59265' < 'PT3M'
2016-01-16 14:27:23,211 Log4j2-3 TRACE Not deleting base=c:\temp\log, relative=app-2016-01-16-14-26-59.log
2016-01-16 14:27:23,212 Log4j2-3 TRACE IfFileName ACCEPTED: 'glob:app-*.log' matches relative path 'app-2016-01-16-14-25-59.log'
2016-01-16 14:27:23,212 Log4j2-3 TRACE IfLastModified REJECTED: app-2016-01-16-14-25-59.log ageMillis '112380' < 'PT3M'
2016-01-16 14:27:23,212 Log4j2-3 TRACE Not deleting base=c:\temp\log, relative=app-2016-01-16-14-25-59.log
2016-01-16 14:27:23,213 Log4j2-3 TRACE IfFileName ACCEPTED: 'glob:app-*.log' matches relative path 'app-2016-01-16-14-24-59.log'
2016-01-16 14:27:23,213 Log4j2-3 TRACE IfLastModified REJECTED: app-2016-01-16-14-24-59.log ageMillis '120025' < 'PT3M'
2016-01-16 14:27:23,213 Log4j2-3 TRACE Not deleting base=c:\temp\log, relative=app-2016-01-16-14-24-59.log
2016-01-16 14:27:23,214 Log4j2-3 TRACE IfFileName ACCEPTED: 'glob:app-*.log' matches relative path 'app-2016-01-16-14-23-59.log'
2016-01-16 14:27:23,214 Log4j2-3 TRACE IfLastModified ACCEPTED: app-2016-01-16-14-23-59.log ageMillis '233748' >= 'PT3M'
2016-01-16 14:27:23,214 Log4j2-3 TRACE Deleting c:\temp\log\app-2016-01-16-14-23-59.log
您可以启用状态记录并显示输出吗？