Question

how to create a log file

Asked by: priyapratheep

hi,

   i want to know how to create a log file in java/j2ee(jsp)

  can anybody give me one example program

Regards

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Asked On
2008-08-17 at 23:56:23ID23655570
Tags

java log file creation

Topics

Sun ONE

,

Java Server Pages (JSP)

,

Java Programming Language

Participating Experts
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Answers

 

by: darkapplePosted on 2008-08-18 at 02:38:36ID: 22250374

I prefer to use Log4j. Though there is built-in SDK Logger system, Log4j is extremely flexible and powerful. Log4j JAR file can be deployed and configured as part of the Web application and does not have to be globally configured like the SDK logger.

For using Log4j, u need log4j.jar and have to create log4j.properties file.

The log4j.properties should be in classpath.


Here are lots of examples of log4j

http://www.java2s.com/Code/Java/Language-Basics/log4jAcompleteexample.htm

package com.foo
import org.apache.log4j.Logger;
 
public class SimpleLogging {
    /** Creates a new instance of SimpleLogging */
    public SimpleLogging() {
    }
 
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Logger logger =Logger.getLogger("name");
        logger.info("Hello this is an info message");
    }
}
 
 
 
 
 
/*** Here is log4j.properties file ***/
 
 
# define the root logger with two appenders writing to console and file
log4j.rootLogger = DEBUG, CONSOLE, FILE
 
#define your own logger named com.foo
log4j.logger.com.foo=com.foo.MyLogger
#assign appender to your own logger
log4j.logger.com.foo.appender=FILE
 
#define the appender named FILE log4j.appender.FILE=org.apache.log4j.FileAppender
log4j.appender.FILE.File=${user.home}/log.out
 
#define the appender named CONSOLE
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.conversionPattern=%m%n
                                              
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by: kodimakPosted on 2008-08-18 at 04:40:35ID: 22250855

Try this


<%@page import="java.sql.*"%>
<%@page import="java.io.File"%>
<%@ page import="org.apache.commons.logging.Log" %>
<%@ page import="org.apache.commons.logging.LogFactory" %>  
<jsp:declaration>
private static final Log logger = LogFactory.getLog("YOU_JSP_NAME");
</jsp:declaration>
<%!   logger.debug("debug: blablabla");
          logger.info("info: blablabla");
         logger.warn("warn: blablabla");  
         logger.error("error: blablabla"); %>

In your log4j.properties, look at the comment I added:
log4j.appender.logfile.File=myapp.log//HERE THE PATH OF YOUR LOG FILE

For example you can do this:
log4j.appender.logfile.File=D:/tmp/java/MyApp/myapp.log  


 

by: formula1actPosted on 2008-08-18 at 07:08:09ID: 22251926

Hi
The below gives a comparison between java.util.logging and another utility called log4j

http://www.onjava.com/pub/a/onjava/2004/09/29/smtp-logging.html

log4j instructions
http://www.onjava.com/pub/a/onjava/2002/08/07/log4j.html

java.util.logging instructions
http://www.onjava.com/pub/a/onjava/2002/06/19/log.html

 

by: priyapratheepPosted on 2008-09-08 at 02:43:20ID: 22415743

good

20120131-EE-VQP-002

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