Class FileHandler

Direct Known Subclasses:

public class FileHandler extends Handler
Implementation of Handler that appends log messages to a file named {prefix}{date}{suffix} in a configured directory.

The following configuration properties are available:

  • directory - The directory where to create the log file. If the path is not absolute, it is relative to the current working directory of the application. The Apache Tomcat configuration files usually specify an absolute path for this property, ${catalina.base}/logs Default value: logs
  • rotatable - If true, the log file will be rotated on the first write past midnight and the filename will be {prefix}{date}{suffix}, where date is yyyy-MM-dd. If false, the file will not be rotated and the filename will be {prefix}{suffix}. Default value: true
  • prefix - The leading part of the log file name. Default value: juli.
  • suffix - The trailing part of the log file name. Default value: .log
  • bufferSize - Configures buffering. The value of 0 uses system default buffering (typically an 8K buffer will be used). A value of <0 forces a writer flush upon each log write. A value >0 uses a BufferedOutputStream with the defined value but note that the system default buffering will also be applied. Default value: -1
  • encoding - Character set used by the log file. Default value: empty string, which means to use the system default character set.
  • level - The level threshold for this Handler. See the java.util.logging.Level class for the possible levels. Default value: ALL
  • filter - The java.util.logging.Filter implementation class name for this Handler. Default value: unset
  • formatter - The java.util.logging.Formatter implementation class name for this Handler. Default value: org.apache.juli.OneLineFormatter
  • maxDays - The maximum number of days to keep the log files. If the specified value is <=0 then the log files will be kept on the file system forever, otherwise they will be kept the specified maximum days. Default value: -1.
  • Field Details


      public static final int DEFAULT_MAX_DAYS
      See Also:
    • writerLock

      protected final ReadWriteLock writerLock
      Lock used to control access to the writer.
  • Constructor Details

    • FileHandler

      public FileHandler()
    • FileHandler

      public FileHandler(String directory, String prefix, String suffix)
    • FileHandler

      public FileHandler(String directory, String prefix, String suffix, int maxDays)
  • Method Details

    • publish

      public void publish(LogRecord record)
      Format and publish a LogRecord.
      Specified by:
      publish in class Handler
      record - description of the log event
    • close

      public void close()
      Close the currently open log file (if any).
      Specified by:
      close in class Handler
    • closeWriter

      protected void closeWriter()
    • flush

      public void flush()
      Flush the writer.
      Specified by:
      flush in class Handler
    • open

      protected void open()
      Open the new log file for the date specified by date.
    • openWriter

      protected void openWriter()