为了后代。我使用下面的类作为我的自定义滚动策略
import org.apache.log4j.rolling.RollingPolicyBase;
import org.apache.log4j.rolling.RolloverDescription;
import org.apache.log4j.rolling.RolloverDescriptionImpl;
import org.apache.log4j.rolling.TriggeringPolicy;
import org.apache.log4j.Appender;
import org.apache.log4j.spi.LoggingEvent;
public final class CustomRollingPolicy extends RollingPolicyBase
implements TriggeringPolicy
{
private short curFileId = -1;
private String lastFileName = null;
static private final long FILETIMEINTERVAL = 86400000l;
static private final int NUM_FILES = 10;//86400000l;
public String folderName = "";
public String getFolderName() {
return folderName;
}
public void setFolderName(String folderName) {
this.folderName = folderName;
}
private short calculateID(long startTime) {
return (short) ((startTime / FILETIMEINTERVAL) % NUM_FILES);
}
public String getCurrentFileName()
{
StringBuffer buf = new StringBuffer();
buf.append(folderName);
buf.append(calculateID(System.currentTimeMillis()));
return buf.toString();
}
public void activateOptions()
{
super.activateOptions();
this.lastFileName = getCurrentFileName();
}
public RolloverDescription initialize(String currentActiveFile, boolean append)
{
curFileId = this.calculateID(System.currentTimeMillis());
lastFileName = getCurrentFileName();
String fileToUse = activeFileName != null? activeFileName: currentActiveFile != null?currentActiveFile:lastFileName;
return new RolloverDescriptionImpl(fileToUse, append, null, null);
}
public RolloverDescription rollover(String currentActiveFile)
{
curFileId = this.calculateID(System.currentTimeMillis());
String newFileName = getCurrentFileName();
if (newFileName.equals(this.lastFileName))
{
return null;
}
String lastBaseName = this.lastFileName;
String nextActiveFile = newFileName;
if (!currentActiveFile.equals(lastBaseName))
{
nextActiveFile = currentActiveFile;
}
this.lastFileName = newFileName;
return new RolloverDescriptionImpl(nextActiveFile, false, null, null);
}
public boolean isTriggeringEvent(Appender appender, LoggingEvent event, String filename, long fileLength)
{
short fileIdForCurrentServerTime = this.calculateID(System.currentTimeMillis());
return curFileId != fileIdForCurrentServerTime;
}
}
这是我的 log4j xml 文件中的 appender 配置:
<!-- ROLLING FILE APPENDER FOR RUM LOGS -->
<appender name="rumRollingFileAppender" class="org.apache.log4j.rolling.RollingFileAppender">
<rollingPolicy class="com.ntrs.wpa.util.CustomRollingPolicy">
<param name="folderName" value="C:/bea-portal-10.3.2/logs/"/>
<param name="FileNamePattern" value="C:/bea-portal-10.3.2/logs/foo.%d{yyyy-MM}.gz"/>
</rollingPolicy>
<layout class="com.ntrs.els.log4j.AppServerPatternLayout">
<param name="ConversionPattern" value="%m%n" />
</layout>
</appender>