[Common Java tools]-log4j 1: log4j Quick Start

1. Obtain log4j. Jar

• Download address of log4j.zip: http://labs.mop.com/apache-mirror/logging/log4j/1.2.17/log4j-1.2.17.zip
• Decompress log4j.zip to get the log4j-1.2.17.jar

2. Dependency log4j-1.2.17.jar in eclipse

• Right-click Project -- Build path -- configure build path -- libraries -- add external jars .. -- select log4j-1.2.17.jar -- OK...

3. Configure log4j. Properties

1. create the log4j file in the src directory of the project. properties step: Right-click SRC -- New -- file -- In File Name: Enter log4j. properties --- OK... 2. in log4j. properties:
Log4j. rootlogger = info, Stdout
Log4j. appender. stdout = org. Apache. log4j. leleappender
Log4j. appender. stdout. layout = org. Apache. log4j. patternlayout
Log4j. appender. stdout. layout. conversionpattern = % 5 p [% T] (% F: % L)-% m % N
OK. You can use it later. configure it as needed and analyze it later.
4. Create a test file named test. java.

ImportOrg. Apache. commons. Logging. log;

ImportOrg. Apache. commons. Logging. logfactory;

Public ClassTest
{

StaticLogLog=
Logfactory.Getlog(Test.Class);

Public VoidLog (){

Log. Debug ("Debug
Info .");

Log. Info ("info
Info ");

Log. Warn ("warn
Info ");

Log. Error ("error
Info ");

Log. Fatal ("fatal
Info ");

}

/**

*@ ParamARGs

*/

Public Static VoidMain (string []
ARGs ){

Test test =NewTest ();

Test. Log ();

}

}

Run and check the result... OK. You already know how to use it. Let's see why it is used ..

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