Question

我想将log4j和log4net appender的日志文件名设置为具有当前日期。我们正在进行每日翻转，但当前日志文件没有日期。日志文件名格式为

logname.2008-10-10.log

任何人都知道我这样做的最好方法吗？

编辑：我忘了提到我们也想在log4net中这样做。此外，任何解决方案都需要在JBoss中使用。

Answer 1

DailyRollingFileAppender是您正在搜索的内容。

<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>

Answer 2

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

Answer 3

我99％确定RollingFileAppender / DailyRollingFileAppender虽然它为您提供了所需的日期滚动功能，却无法指定当前日志文件也应该使用DatePattern。

您可能只是简单地子类化RollingFileAppender（或DailyRollingFileAppender，我忘记了log4net中的哪个）并修改了命名逻辑。

Answer 4

我已经创建了一个可以做到这一点的追加器。 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);
            }
        }
    }
  }

}

Answer 5

我不知道它是否可以在Java中使用，但在.NET中，RollingFileAppender上的属性StaticLogFileName可以为您提供所需的内容。默认值为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&quot;.log&quot;" />
  <layout type="log4net.Layout.PatternLayout">
    <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
  </layout>
</appender>

".log"是为了不让dateformat在日志中识别全局日期模式'g'。

Answer 6

作为对提到DailyRollingFileAppender的两个答案的回应（对不起，我没有足够的代表直接对他们发表评论，我认为这需要提及），我会警告说，不幸的是那个班的开发者有记录了它表现出同步和数据丢失，并建议应该为新部署寻求替代方案。

DailyRollingFileAppender JavaDoc

Answer 7

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);

Answer 8

此示例将为每分钟创建记录器，如果您想要更改每天更改DatePattern值。

<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>

Answer 9

即使您像@gedevan建议的那样使用DailyRollingFileAppender，您仍然会得到logname.log.2008-10-10（一天之后，因为前一天的日志将被存档，并且日期将被连接到其文件名）。因此，如果您最后需要.log，则必须在DatePattern上执行以下操作：

log4j.appender.file.DatePattern='.'yyyy-MM-dd-HH-mm'.log'

Answer 10

您可以像这样以编程方式执行此操作：

        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);
            }
        }

设置日志文件名以在Log4j中包含当前日期

10 个答案: