How the actual developer modifies the logger configuration

By default, the JDK's logmanager will read the configuration in the "lib/logging.properties" file in the JRE directory.

Custom configurations are often required in development, so you can modify the default configuration in two ways:

1, through the Java command line to modify the way

In addition, Logmanager can also allow users to control the configuration of the log based on two system properties: "Java.util.logging.config.class" "Java.util.logging.config.file"

In which, class this property takes precedence, and if set, the file attribute is ignored.

There are two ways to set properties in Java: When the Preferences API starts, the command-line arguments

Refer to the JDK documentation for the preferences API.

Command-line arguments refer to the-d<name>=<value> method of specifying attributes at startup, where we can use the

Java-djava.util.logging.config.file= "Abc.properties"

Specifies that the "abc.properties" file be used as a configuration file

2, custom subclass log class, in the code re-read configuration information

Package com.proj.log;
Import java.io.IOException;
Import Java.io.InputStream;
Import Java.util.logging.LogManager;

Import Java.util.logging.Logger;
    /** * Log {@link Java.util.logging.Logger} get/public class logging {private static Logger Logger = null;  Private Logging () {} public static Logger GetLogger () {if (null = = Logger) {InputStream is
            = Logging.class.getClass (). getResourceAsStream ("/logger.properties");
            try {Logmanager.getlogmanager (). Readconfiguration (IS);
            catch (Exception e) {logging.warning ("Input properties file is error.\n" + e.tostring ());
                }finally{try {is.close ();
                catch (IOException e) {logging.warning ("Close FileInputStream a case.\n" + e.tostring ());
        } logger = Logger.getlogger ("logger");
   return logger; private static Logger logging = Logger.getlogger (Logging.class.getName ()); }

The default is to add files to the SRC directory logger.properties:

handlers = Java.util.logging.consolehandler,java.util.logging.filehandler
 
Java.util.logging.ConsoleHandler.formatter = Java.util.logging.SimpleFormatter
Java.util.logging.ConsoleHandler.level = INFO
 
Java.util.logging.FileHandler.pattern = C:/my.log%g.log
Java.util.logging.FileHandler.formatter = Java.util.logging.SimpleFormatter
Java.util.logging.FileHandler.limit = 104857600
java.util.logging.FileHandler.count = 3
Java.util.logging.FileHandler.append = True
java.util.logging.FileHandler.level = INFO
 
logger.level = FINEST

Test Cases:

public class Loggertest extends testcase{
    @Test public
    void Testlogger () throws Exception {Logger
        Logger = Lo Gging.getlogger ();
        Logger.finest ("finest");
        Logger.finer ("finer");
        Logger.fine ("fine");
        Logger.info ("info");
        Logger.config ("config");
        Logger.warning ("warning");
        Logger.severe ("severe");
         
    }

Modify Date format:

Import java.io.IOException;
Import Java.io.PrintWriter;
Import Java.io.StringWriter;
Import Java.text.SimpleDateFormat;
Import Java.util.Date;
Import Java.util.logging.FileHandler;
Import Java.util.logging.Formatter;
Import Java.util.logging.Level;
Import Java.util.logging.LogRecord;

Import Java.util.logging.Logger; public class Logtest {public static void main (string[] args) throws IOException {Logger log = Logger.getlogger (logte
		St.class.getName ());
		
		Log.setlevel (Level.info);
		Filehandler Filehandler = new Filehandler ("E:/testlog%g.log", true);
		Filehandler.setlevel (Level.severe);
								        Filehandler.setformatter (New Formatter () {public String format (LogRecord record) {  
								        SimpleDateFormat sd = new SimpleDateFormat ("[Yyyy-mm-dd HH:mm:ss]");  
										String d = Sd.format (new Date ());
									Return D + record.getlevel () + ":" + record.getmessage () + "n";
		}
								 });
		Log.addhandler (Filehandler); try {THRow new Exception ("ldddddddd");
			catch (Exception e) {stringwriter SW = new StringWriter ();
			E.printstacktrace (new PrintWriter (SW));
		Log.severe (Sw.tostring ());
	} log.info ("AAA");
 }
}

Format: 2014-10-29 17:39:11