前言
logging.properties配置文件用於原生的日誌記錄器進行配置，對該配置文件有一定了解可以更好的使用日誌記錄器。
文件路徑
jre/lib/logging.properties
文件概覽
############################################################
# Default Logging Configuration File#
# You can use a different file by specifying a filename
# with the java.util.logging.config.file system property.
# For example java -Djava.util.logging.config.file=myfile
############################################################
############################################################
# Global properties
############################################################
# "handlers" specifies a comma separated list of log Handler
# classes. These handlers will be installed during VM startup.
# Note that these classes must be on the system classpath.
# By default we only configure a ConsoleHandler, which will only
# show messages at the INFO and above levels.
handlers= java.util.logging.ConsoleHandler
# To also add the FileHandler, use the following line instead.
handlers= java.util.logging.FileHandler, java.util.logging.ConsoleHandler
# Default global logging level.
# This specifies which kinds of events are logged across
# all loggers. For any given facility this global level
# can be overriden by a facility specific level
# Note that the ConsoleHandler also has a separate level
# setting to limit messages printed to the console.
.level= INFO
############################################################
# Handler specific properties.
# Describes specific configuration info for Handlers.
############################################################
# default file output is in user's home directory.
java.util.logging.FileHandler.pattern = %h/java%u.log
java.util.logging.FileHandler.limit = 50000
java.util.logging.FileHandler.count = 1
java.util.logging.FileHandler.formatter = java.util.logging.XMLFormatter
java.util.logging.FileHandler.append = true
# Limit the message that are printed on the console to INFO and above.
java.util.logging.ConsoleHandler.level=INFO
java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter
# Example to customize the SimpleFormatter output format
# to print one-line log message like this:
# <level>: <log message> [<date/time>]##
java.util.logging.SimpleFormatter.format=%4$s: %5$s [%1$tc]%n
############################################################
# Facility specific properties.
# Provides extra control for each logger.
############################################################
# For example, set the com.xyz.foo logger to only log SEVERE
# messages:com.xyz.foo.level = SEVERE
內容分析
# Default Logging Configuration File #
# You can use a different file by s filename
# with the java.util.logging.config.file system property.
# For example java -Djava.util.logging.config.file=myfile
java -Djava.util.logging.config.file=myfile
如果想要使用另一個配置文件，就要將java -Djava.util.logging.config.file特性設置成配置文件的存儲位置
除了以上方法，還可以利用原生API進行設置,在main中執行
System.setProperty("java -Djava.util.logging.config.file",myfile);
該方法會調用readConfiguration()來重新初始化日誌管理器
# "handlers" specifies a comma separated list of log Handler
# classes. These handlers will be installed during VM startup.
# Note that these classes must be on the system classpath.
# By default we only configure a ConsoleHandler, which will only
# show messages at the INFO and above levels.
handlers= java.util.logging.ConsoleHandler
# To also add the FileHandler, use the following line instead.
handlers= java.util.logging.FileHandler, java.util.logging.ConsoleHandler
該段配置信息用於指定日誌記錄器的處理器，既可以配置一個，也可以通過合適的分隔符“,”來配置多個處理器。
# Default global logging level.
# This specifies which kinds of events are logged across
# all loggers. For any given facility this global level
# can be overriden by a facility specific level
# Note that the ConsoleHandler also has a separate level
# setting to limit messages printed to the console.
.level= INFO
由註釋可以得知，.level用於全局設置日誌處理器處理對象信息的級別的閾值，這裏的設置的級別是INFO。
# default file output is in user's home directory.
java.util.logging.FileHandler.pattern = %h/java%u.log
java.util.logging.FileHandler.limit = 50000
java.util.logging.FileHandler.count = 1
java.util.logging.FileHandler.formatter = java.util.logging.XMLFormatter
java.util.logging.FileHandler.append = true
這裏配置了日誌文件的名字格式、文件格式（這裏是XML格式）等，
通過註釋，我們可以得知日誌文件的存儲位置位於User文件夾。
# Limit the message that are printed on the console to INFO and above.
java.util.logging.ConsoleHandler.level=INFO
java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter
# Example to customize the SimpleFormatter output format
# to print one-line log message like this:
# <level>: <log message> [<date/time>]##
java.util.logging.SimpleFormatter.format=%4$s: %5$s [%1$tc]%n
這裏配置的是輸出到日誌信息輸出到控制檯的最低級別（這裏是INFO，必須要注意該級別不能低於全局閾值）、輸出到控制檯日誌信息的格式。
# For example, set the com.xyz.foo logger to only log SEVERE
# messages:com.xyz.foo.level = SEVERE
這裏是對自定義的日誌記錄器配置，指定日誌記錄的記錄級別，低於該級別的日誌信息不會被處理。