我想为 log4j 和 log4net 附加程序设置日志文件名以具有当前日期。 我们正在进行每日滚动，但当前日志文件没有日期。 日志文件名格式为
logname.2008-10-10.log
有人知道我这样做的最佳方法吗？
编辑：我忘了提及我们也想在 log4net 中执行此操作。 另外，任何解决方案都需要在 JBoss 中可用。
DailyRollingFileAppender 正是您正在寻找的。
<appender name="roll" class="org.apache.log4j.DailyRollingFileAppender">
<param name="File" value="application.log" />
<param name="DatePattern" value=".yyyy-MM-dd" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern"
value="%d{yyyy-MMM-dd HH:mm:ss,SSS} [%t] %c %x%n %-5p %m%n"/>
</layout>
</appender>
使用 log4j.properties 文件，并在我的 POM 中包含 apache-log4j-extras 1.1 和 log4j 1.2.16
log4j.appender.LOGFILE=org.apache.log4j.rolling.RollingFileAppender
log4j.appender.LOGFILE.RollingPolicy=org.apache.log4j.rolling.TimeBasedRollingPolicy
log4j.appender.LOGFILE.RollingPolicy.FileNamePattern=/logs/application_%d{yyyy-MM-dd}.log
我 99% 确信 RollingFileAppender/DailyRollingFileAppender 虽然为您提供了所需的日期滚动功能，但没有任何方法来指定当前日志文件也应使用
DatePattern您可能只需简单地子类化 RollingFileAppender （或 DailyRollingFileAppender，我忘记了 log4net 中的哪个）并修改命名逻辑。
我已经创建了一个可以做到这一点的附加程序。 http://stauffer.james.googlepages.com/DateFormatFileAppender.java
/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software
* License version 1.1, a copy of which has been included with this
* distribution in the LICENSE.txt file. */
package sps.log.log4j;
import java.io.IOException;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.apache.log4j.*;
import org.apache.log4j.helpers.LogLog;
import org.apache.log4j.spi.LoggingEvent;
/**
* DateFormatFileAppender is a log4j Appender and extends
* {@link FileAppender} so each log is
* named based on a date format defined in the File property.
*
* Sample File: 'logs/'yyyy/MM-MMM/dd-EEE/HH-mm-ss-S'.log'
* Makes a file like: logs/2004/04-Apr/13-Tue/09-45-15-937.log
* @author James Stauffer
*/
public class DateFormatFileAppender extends FileAppender {
/**
* The default constructor does nothing.
*/
public DateFormatFileAppender() {
}
/**
* Instantiate a <code>DailyRollingFileAppender</code> and open the
* file designated by <code>filename</code>. The opened filename will
* become the ouput destination for this appender.
*/
public DateFormatFileAppender (Layout layout, String filename) throws IOException {
super(layout, filename, true);
}
private String fileBackup;//Saves the file pattern
private boolean separate = false;
public void setFile(String file) {
super.setFile(file);
this.fileBackup = getFile();
}
/**
* If true each LoggingEvent causes that file to close and open.
* This is useful when the file is a pattern that would often
* produce a different filename.
*/
public void setSeparate(boolean separate) {
this.separate = separate;
}
protected void subAppend(LoggingEvent event) {
if(separate) {
try {//First reset the file so each new log gets a new file.
setFile(getFile(), getAppend(), getBufferedIO(), getBufferSize());
} catch(IOException e) {
LogLog.error("Unable to reset fileName.");
}
}
super.subAppend(event);
}
public
synchronized
void setFile(String fileName, boolean append, boolean bufferedIO, int bufferSize)
throws IOException {
SimpleDateFormat sdf = new SimpleDateFormat(fileBackup);
String actualFileName = sdf.format(new Date());
makeDirs(actualFileName);
super.setFile(actualFileName, append, bufferedIO, bufferSize);
}
/**
* Ensures that all of the directories for the given path exist.
* Anything after the last / or \ is assumed to be a filename.
*/
private void makeDirs (String path) {
int indexSlash = path.lastIndexOf("/");
int indexBackSlash = path.lastIndexOf("\\");
int index = Math.max(indexSlash, indexBackSlash);
if(index > 0) {
String dirs = path.substring(0, index);
// LogLog.debug("Making " + dirs);
File dir = new File(dirs);
if(!dir.exists()) {
boolean success = dir.mkdirs();
if(!success) {
LogLog.error("Unable to create directories for " + dirs);
}
}
}
}
}
我不知道在 Java 中是否可行，但在 .NET 中，RollingFileAppender 上的 StaticLogFileName 属性可以满足您的需求。默认为 true。
<staticLogFileName value="false"/>
完整配置：
<appender name="DefaultFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="application"/>
<staticLogFileName value="false"/>
<appendToFile value="true" />
<rollingStyle value="Date" />
<datePattern value="yyyy-MM-dd".log"" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
".log"此示例将为每分钟创建记录器，如果您想每天更改，请更改
DatePattern<appender name="ASYNC" class="org.apache.log4j.DailyRollingFileAppender">
<param name="File" value="./applogs/logger.log" />
<param name="Append" value="true" />
<param name="Threshold" value="debug" />
<appendToFile value="true" />
<param name="DatePattern" value="'.'yyyy_MM_dd_HH_mm"/>
<rollingPolicy class="org.apache.log4j.rolling.TimeBasedRollingPolicy">
<param name="fileNamePattern" value="./applogs/logger_%d{ddMMMyyyy HH:mm:ss}.log"/>
<param name="rollOver" value="TRUE"/>
</rollingPolicy>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{ddMMMyyyy HH:mm:ss,SSS}^[%X{l4j_mdc_key}]^[%c{1}]^ %-5p %m%n" />
</layout>
</appender>
<root>
<level value="info" />
<appender-ref ref="ASYNC" />
</root>
作为对提到 DailyRollingFileAppender 的两个答案的回应（抱歉，我没有足够的代表来直接评论它们，我认为需要提及这一点），我要警告说，不幸的是该类的开发人员已经记录了这一点它表现出同步和数据丢失，并建议为新部署寻求替代方案。
您可以动态设置FileAppender
SimpleLayout layout = new SimpleLayout();
FileAppender appender = new FileAppender(layout,"logname."+new Date().toLocaleString(),false);
logger.addAppender(appender);
仅使用 TimeBasedRollingPolicy 并且不要使用 param name="File"
<appender name="pdi-execution-appender" class="org.apache.log4j.rolling.RollingFileAppender">
<!-- The active file to log to; this example is for Pentaho Server.-->
<param name="Append" value="true" />
<param name="Threshold" value="INFO"/>
<rollingPolicy class="org.apache.log4j.rolling.TimeBasedRollingPolicy">
<!-- See javadoc for TimeBasedRollingPolicy -->
<param name="FileNamePattern" value="logs/ETL-LogFile.%d{yyyyMMdd}.log" />
</rollingPolicy>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value='%d{yyyy-MM-dd HH:mm:ss.SSS} %-5p [%t] %m'/>
</layout>
</appender>
您可以像这样以编程方式完成此操作：
String dateFile = LocalDate.now().toString() + ".log";
Enumeration enm = Logger.getRootLogger().getAllAppenders();
Appender appender = null;
while(enm.hasMoreElements()){
appender = (Appender)enm.nextElement();
String c = appender.getClass().toString();
if(c.contains("FileAppender")){
String f = ((FileAppender)appender).getFile();
((FileAppender)appender).setFile(f+dateFile);
System.out.println("From:"+f+" to:"+dateFile);
}
}
即使您像@gedevan建议的那样使用
DailyRollingFileAppenderlogname.log.2008-10-10所以如果你想在最后得到.log，你必须在
DatePatternlog4j.appender.file.DatePattern='.'yyyy-MM-dd-HH-mm'.log'“appender.fileName =FileName-${date:yyyy-MM-dd-HH-mm-ss}.log”使用此功能可以完美地用于 1og4j2.properties