我是 log4j 的新手。在我们的应用程序中，我们需要以这样一种方式实现日志记录，即所有不同的级别都将转到不同的文件。所以我通过谷歌搜索扩展了 RollingFileAppender，如下所示。
import java.io.File;
import java.io.IOException;
import org.apache.log4j.FileAppender;
import org.apache.log4j.Layout;
import org.apache.log4j.MDC;
import org.apache.log4j.RollingFileAppender;
import org.apache.log4j.spi.ErrorCode;
import org.apache.log4j.spi.LoggingEvent;
public class LogLevelFilterFileAppender extends RollingFileAppender {
private final static String DOT = ".";
private final static String HIPHEN = "-";
private static final String ORIG_LOG_FILE_NAME = "OrginalLogFileName";
public LogLevelFilterFileAppender() {
}
/*public LogLevelFilterFileAppender(Layout layout, String fileName,
boolean append, boolean bufferedIO, int bufferSize)
throws IOException {
super(layout, fileName, append, bufferedIO, bufferSize);
}
*/
public LogLevelFilterFileAppender(Layout layout, String fileName,
boolean append) throws IOException {
super(layout, fileName, append);
}
public LogLevelFilterFileAppender(Layout layout, String fileName)
throws IOException {
super(layout, fileName);
}
@Override
public void activateOptions() {
MDC.put(ORIG_LOG_FILE_NAME, fileName);
super.activateOptions();
}
@Override
public void append(LoggingEvent event) {
try {
setFile(appendLevelToFileName((String) MDC.get(ORIG_LOG_FILE_NAME),
event.getLevel().toString()), fileAppend, bufferedIO,
bufferSize);
} catch (IOException ie) {
errorHandler
.error(
"Error occured while setting file for the log level "
+ event.getLevel(), ie,
ErrorCode.FILE_OPEN_FAILURE);
}
super.append(event);
}
private String appendLevelToFileName(String oldLogFileName, String level) {
if (oldLogFileName != null) {
final File logFile = new File(oldLogFileName);
String newFileName = "";
final String fn = logFile.getName();
final int dotIndex = fn.indexOf(DOT);
if (dotIndex != -1) {
// the file name has an extension. so, insert the level
// between the file name and the extension
/*newFileName = fn.substring(0, dotIndex) + HIPHEN + level + DOT
+ fn.substring(dotIndex + 1);*/
newFileName= level+".log";
} else {
// the file name has no extension. So, just append the level
// at the end.
newFileName = fn + HIPHEN + level;
}
return logFile.getParent() + File.separator + newFileName;
}
return null;
}
}
我的 log4j.properties 是这样的：
logDir=/opt/ems/release/logs
log4j.logger.A= SECURITY#SecurityLevel,A1,A31
log4j.additivity.A=false
log4j.appender.A1 = LogLevelFilterFileAppender
log4j.appender.A1.MaxBackupIndex=20
log4j.appender.A1.append=true
log4j.appender.A1.layout.ConversionPattern = %d [%-15.15t] %-5p %-30.30c{1} - %m%n
log4j.appender.A1.layout = org.apache.log4j.PatternLayout
log4j.appender.A1.File = /home/krishna/Desktop/logs1.log
log4j.appender.A1.maxFileSize=5MB
log4j.category=SecurityLevel
log4j.logger.B= PRF#PRFLevel,A2,A31
log4j.additivity.B=false
log4j.appender.A2 = LogLevelFilterFileAppender
log4j.appender.A2.MaxBackupIndex=20
log4j.appender.A2.append=true
log4j.appender.A2.layout.ConversionPattern =%d [%-15.15t] %-5p %-30.30c{1} - %m%n
log4j.appender.A2.layout = org.apache.log4j.PatternLayout
log4j.appender.A2.File = /home/krishna/Desktop/logs1.log
log4j.appender.A2.maxFileSize=5MB
log4j.category=PRFLevel
log4j.logger.C= VRB#VRBLevel,A3,A31
log4j.additivity.C=false
log4j.appender.A3 = LogLevelFilterFileAppender
log4j.appender.A3.MaxBackupIndex=20
log4j.appender.A3.append=true
log4j.appender.A3.layout.ConversionPattern =%d [%-15.15t] %-5p %-30.30c{1} - %m%n
log4j.appender.A3.layout = org.apache.log4j.PatternLayout
log4j.appender.A3.File = /home/krishna/Desktop/logs1.log
log4j.appender.A3.maxFileSize=5MB
log4j.category=VRBLevel
log4j.appender.A31 = org.apache.log4j.ConsoleAppender
log4j.appender.A31.layout.ConversionPattern =%d [%-15.15t] %-5p %-30.30c{1} - %m%n
log4j.appender.A31.layout = org.apache.log4j.PatternLayout
log4j.logger.D = INFO,A4,A31
log4j.additivity.D=false
log4j.appender.A4 = LogLevelFilterFileAppender
log4j.appender.A4.MaxBackupIndex=20
log4j.appender.A4.append=true
log4j.appender.A4.layout.ConversionPattern =%d [%-15.15t] %-5p %-30.30c{1} - %m%n
log4j.appender.A4.layout = org.apache.log4j.PatternLayout
log4j.appender.A4.File = /home/krishna/Desktop/logs1.log
log4j.appender.A4.maxFileSize=5MB
log4j.category=INFO
log4j.logger.E= WARN, A5,A31
log4j.additivity.E=false
log4j.appender.A5 = LogLevelFilterFileAppender
log4j.appender.A5.MaxBackupIndex=20
log4j.appender.A5.append=true
log4j.appender.A5.layout.ConversionPattern =%d [%-15.15t] %-5p %-30.30c{1} - %m%n
log4j.appender.A5.layout = org.apache.log4j.PatternLayout
log4j.appender.A5.File = /home/krishna/Desktop/logs1.log
log4j.appender.A5.maxFileSize=5MB
log4j.category= WARN
log4j.logger.F= ERROR,A6,A31
log4j.additivity.F=false
log4j.appender.A6 = LogLevelFilterFileAppender
log4j.appender.A6.MaxBackupIndex=20
log4j.appender.A6.append=true
log4j.appender.A6.layout.ConversionPattern =%d [%-15.15t] %-5p %-30.30c{1} - %m%n
log4j.appender.A6.layout = org.apache.log4j.PatternLayout
log4j.appender.A6.File = /home/krishna/Desktop/logs1.log
log4j.appender.A6.maxFileSize=10KB
log4j.category= ERROR
log4j.logger.G= DEBUG,A7,A31
log4j.additivity.F=false
log4j.appender.A7 = LogLevelFilterFileAppender
log4j.appender.A7.MaxBackupIndex=20
log4j.appender.A7.append=true
log4j.appender.A7.layout.ConversionPattern =%d [%-15.15t] %-5p %-30.30c{1} - %m%n
log4j.appender.A7.layout = org.apache.log4j.PatternLayout
log4j.appender.A7.File = /home/krishna/Desktop/logs1.log
log4j.appender.A7.maxFileSize=5MB
log4j.category= DEBUG
现在的问题是没有发生翻转，我不知道该怎么做。我知道我们需要重写翻转方法，但是我们需要在其中做些什么。我是否还需要添加 subappend 方法。请帮忙。提前致谢。