Java compact1, compact2, compact3 java.util.logging Class StreamHandler（JDK8）

Constructor Detail

• StreamHandler

  public StreamHandler()

  Create a StreamHandler, with no current output stream.

• StreamHandler

  public StreamHandler(OutputStream out,
                       Formatter formatter)

  Create a StreamHandler with a given Formatter and output stream.

  Parameters:

  out - the target output stream

  formatter - Formatter to be used to format output

Method Detail

• setOutputStream

  protected void setOutputStream(OutputStream out)
                          throws SecurityException

  Change the output stream.

  If there is a current output stream then the Formatter's tail string is written and the stream is flushed and closed. Then the output stream is replaced with the new output stream.

  Parameters:

  out - New output stream. May not be null.

  Throws:

  SecurityException - if a security manager exists and if the caller does not have LoggingPermission("control").

• setEncoding

  public void setEncoding(String encoding)
                   throws SecurityException,
                          UnsupportedEncodingException

  Set (or change) the character encoding used by this Handler.

  The encoding should be set before any LogRecords are written to the Handler.

  Overrides:

  setEncoding in class Handler

  Parameters:

  encoding - The name of a supported character encoding. May be null, to indicate the default platform encoding.

  Throws:

  SecurityException - if a security manager exists and if the caller does not have LoggingPermission("control").

  UnsupportedEncodingException - if the named encoding is not supported.

• publish

  public void publish(LogRecord record)

  Format and publish a LogRecord.

  The StreamHandler first checks if there is an OutputStream and if the given LogRecord has at least the required log level. If not it silently returns. If so, it calls any associated Filter to check if the record should be published. If so, it calls its Formatter to format the record and then writes the result to the current output stream.

  If this is the first LogRecord to be written to a given OutputStream, the Formatter's "head" string is written to the stream before the LogRecord is written.

  Specified by:

  publish in class Handler

  Parameters:

  record - description of the log event. A null record is silently ignored and is not published

• isLoggable

  public boolean isLoggable(LogRecord record)

  Check if this Handler would actually log a given LogRecord.

  This method checks if the LogRecord has an appropriate level and whether it satisfies any Filter. It will also return false if no output stream has been assigned yet or the LogRecord is null.

  Overrides:

  isLoggable in class Handler

  Parameters:

  record - a LogRecord

  Returns:

  true if the LogRecord would be logged.

• flush

  public void flush()

  Flush any buffered messages.

  Specified by:

  flush in class Handler

• close

  public void close()
             throws SecurityException

  Close the current output stream.

  The Formatter's "tail" string is written to the stream before it is closed. In addition, if the Formatter's "head" string has not yet been written to the stream, it will be written before the "tail" string.

  Specified by:

  close in class Handler

  Throws:

  SecurityException - if a security manager exists and if the caller does not have LoggingPermission("control").