Tomcat Log Java.util.logging.Logger use (i)

The 1:java SDK has its own logger profile located in the SDK home directory:

Jdk1.6.0_25\jre\lib\logging.properties

2: There are two ways to enable this log configuration

1) with Java-djava.util.logging.config.file=myfile property

Java-djava.util.logging.config.file=myfile  Javaclass

2 Initialize Logmanager in the program, which also applies to Web projects based on Tomcat

Logmanager Logmanager = Logmanager.getlogmanager ();
		InputStream in;
		try {in
			= new FileInputStream (LoggerUtils.class.getResource ("/"). GetPath ()
					+ "conf/logging.properties");
			Logmanager.readconfiguration (in);
		} catch (Exception e) {
			e.printstacktrace ();
		}

The main configuration information for logger is as follows:

Handlers User Configuration log processing, mainly Java.util.logging.ConsoleHandler used to print information to the console

There is also a java.util.logging.FileHandler used to write data to the file

handlers= Java.util.logging.ConsoleHandler

# to also add the Filehandler and use the following line instead.
#handlers = Java.util.logging.FileHandler, Java.util.logging.ConsoleHandler

Java.util.logging.FileHandler.pattern =%h/java%u.log Specifies a pattern for the generated output file name.
The pattern consists of strings that include the following special components, and the runtime replaces these components:
"/" Local path name separator "%t" System temp Directory "%h" "User.home" system property value (Win system will be in C:/users/username directory) "%g" distinguish circular log generation number "%u" The only one number "%" to resolve the conflict is converted to a single hundred Fractional symbol "%"

1): This property can write absolute path such as C:/xxxxx/java%u.log but cannot write c:/java%u.log the root directory of four disks cannot be written

2): Absolute path if not exist will be an error

Can ' t load log handler ' Java.util.logging.FileHandler ' java.io.IOException:Couldn ' t get lock for C:/java%u.log java.io.i Oexception:couldn ' t get lock for C:/java%u.log at Java.util.logging.FileHandler.openFiles (filehandler.java:372) at JAV A.util.logging.filehandler.<init> (filehandler.java:208) at Sun.reflect.NativeConstructorAccessorImpl.newInstance0 (Native method) at Sun.reflect.NativeConstructorAccessorImpl.newInstance (nativeconstructoraccessorimpl.java:39) at Sun.reflect.DelegatingConstructorAccessorImpl.newInstance (delegatingconstructoraccessorimpl.java:27) at
	Java.lang.reflect.Constructor.newInstance (constructor.java:513) at Java.lang.Class.newInstance0 (class.java:355) At Java.lang.Class.newInstance (class.java:308) at Java.util.logging.logmanager$3.run (logmanager.java:358) at Java.security.AccessController.doPrivileged (Native method) at Java.util.logging.LogManager.loadLoggerHandlers ( logmanager.java:344) at Java.util.logging.LogManager.initializeGlobalHandlers (Logmanager.java:909) at java.util.logging.logmanager.access$900 (logmanager.java:128) 

Solution:

/** * Initialization Logger related configuration consists mainly of reading the logger.properties file specified in the specified directory/public static void Init () {Logmanager = Logmanager.getl
		Ogmanager ();
		Re-read configuration file//Classloaderlogmanager Logmanager = new Classloaderlogmanager ();
		InputStream instream = null;
			try {instream = new FileInputStream (Log.class.getResource ("/"). GetPath () + "conf/logging.properties");

			Logmanager.readconfiguration (instream);
			String LogPath = Logmanager. GetProperty ("Java.util.logging.FileHandler.pattern"); If you do not start with%, manually create the file files//Otherwise it will be reported as follows: Java.io.IOException:Couldn ' t get lock for C:/xx/java%u.log similar error if (Logpath.start
				Swith ("%") = = False) {File LogFile = new file (LogPath); Note You cannot specify C:/log.file (Logfile.getparentfile (). Exists () = False) {Logfile.getparentfile () in the root directory of the four hard drives under win.
				Mkdirs ();
		A catch (Exception e) {e.printstacktrace ());
				Finally {try {if (instream!= null) {instream.close (); } catch (IOException e) {E.prinTstacktrace ();
 }
		}
	}

Attach the full text of logging.properties:

############################################################ # Default Logging Configuration File # can use a diff  
Erent 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 would be installed during VM startup.
# These classes must are on the system classpath.
# By default We only configure a consolehandler, which'll only # show messages at the INFO and above levels.
Handlers= Java.util.logging.ConsoleHandler # To also add the Filehandler and 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 the ' global level # can is overriden by a facility specific level # of that Consolehandler al
So has a separate level # setting to limit messages printed to the console.
. level= WARNING ############################################################ # 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 #
Limit The message this are printed on the console to INFO and above. Java.util.logging.ConsoleHandler.level = WARNING Java.util.logging.ConsoleHandler.formatter = Java.util.logging.SimpleFormatter ############################################################ # 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