Log4j-simple example of using configuration for log output tools

The performance of log4j is much better than that of system.out.println, especially when a large number of output statements are observed.

--------------------------------------------------------------------------------------------------

Download Address:

Current version, 2.0 beta3

Jar:http://www.apache.org/dyn/closer.cgi/logging/log4j/2.0-beta3/apache-log4j-2.0-beta3-bin.zip

Src:http://mirror.bit.edu.cn/apache/logging/log4j/2.0-beta3/apache-log4j-2.0-beta3-src.zip

Instance version:

Jar:http://archive.apache.org/dist/logging/log4j/1.2.17/log4j-1.2.17.jar

Src:http://archive.apache.org/dist/logging/log4j/1.2.17/log4j-1.2.17-sources.jar

--------------------------------------------------------------------------------------------------

Instance Start (Sample version: 1.2.17):

I. Configuration file log4j.properties

#log4j. Rootlogger, the first parameter indicates the priority of the log record, and only logs that are equal to or greater than this level are output.
#log4j的日志的级别共有以下几种: Off, FATAL, ERROR, WARN, INFO, DEBUG, all,
#但是我们一般只是用ERROR, WARN, INFO, Debug these four kinds (here according to from high to low).
log4j.rootlogger=debug,console 

#将日志输出到控制台 
log4j.appender.console=org.apache.log4j.consoleappender
#日志输出的信息布局
log4j.appender.console.layout=org.apache.log4j.patternlayout
Log4j.appender.console.target=system.out 
#日志输出格式:%d{time format},%c classpath,%n newline,%m print information #中文需 to
Unicode 
# LOG4J.APPENDER.CONSOLE.LAYOUT.CONVERSIONPATTERN=%N[\U65F6\U95F4]%d{yyyy-mm-dd HH\:mm\:ss}  [\u8DEF\u5F84]%c  %n[\u4fe1\u606f]%m%n
LOG4J.APPENDER.CONSOLE.LAYOUT.CONVERSIONPATTERN=%N[\U65F6\U95F4]%d{yyyy-MM-dd HH\:MM\:SS}   

Second, the use of Web engineering deployment

Main Mode 1, log4j.properties placed under SRC

			String Class_path =  getclass (). GetResource ("/"). GetPath ();
			Propertyconfigurator.configure (class_path+ "log4j.properties")//Get log4j profile
			Logger Logger = Logger.getlogger ( Phrase_wordsservlet.class); Gets the instance of log4j, Phrase_wordsservlet is the name of the current Java file
			

Main Way 2, Log4j.properties put in Lib inside (with Log4j.jar package sibling)

		String rootdir=system.getproperty ("User.dir")//Get Engineering Root path
		propertyconfigurator.configure (rootdir+ "\\WebRoot\\ Web-inf\\lib\\log4j.properties ");//Get log4j configuration file
		//propertyconfigurator.configure (" C:\MyEclipse9\Workspaces\ Finance\webroot\web-inf\lib\log4j.properties "); 
		Logger Logger = Logger.getlogger (Logger_test.class); Gets the instance logger.debug of the log4j
	        ("Console debug Information--debug");//7

--------------------------------------------------------------------------------------------------

Accessories: Unicode and Chinese log4j.properties ("\u65f6\u95f4" means "time" in the configuration file)