Log4j applications of Web apps

Log4j applications of Web apps

1. Create log. Properties

Log level is set to info, and debug information is not displayed. Log output is file in sequence, console

Log4j. rootlogger = info, R, console
# Debug, console
Log4j.addivity.org. Apache = true
 
###################
# Console appender
###################
Log4j. appender. Console = org. Apache. log4j. leleappender
Log4j. appender. Threshold = debug
Log4j. appender. Console. Target = system. Out
Log4j. appender. Console. layout = org. Apache. log4j. patternlayout
Log4j. appender. Console. layout. conversionpattern = [framework] % d-% C-%-4r [% T] %-5 p % C % x-% m % N

#####################
# File appender: The file is kb and file. log. N is automatically generated.
#####################
Log4j. appender. r = org. Apache. log4j. rollingfileappender
Log4j. appender. R. File = D: // file. Log
Log4j. appender. R. maxfilesize = 100kb
# Keep one backup file
Log4j. appender. R. maxbackupindex = 1

Log4j. appender. R. layout = org. Apache. log4j. patternlayout
Log4j. appender. R. layout. conversionpattern = % P % T % C-% m % N

2. Create an initialization action Servlet
Import com. Nova. colimas. Web. constants .*;
Import org. Apache. log4j .*;

Public class startupservlet extends action {
Public actionforward execute (actionmapping mapping,
Actionform form,
Httpservletrequest request,
Httpservletresponse response)
Throws exception {

Try {

// Initialize log
Initlog ();
} Catch (exception e ){
E. printstacktrace ();
Return Mapping. findforward ("failure ");
}
Logger logger = logger. getlogger (this. getclass ());
Logger.info ("init log ...");
}

Private void initlog () throws exception {

// Obtain the absolute address of log. Properties
Java.net. url myfile = This. getclass (). getresource ("/resources/log/properties ");

// Load the log configuration file log. Properties
If (myfile. getpath ()! = NULL)
Propertyconfigurator. Configure (myfile. getpath ());
Else
Throw new exception ("no log configure ");
}
}

3. Write logs

Public class loginaction extends action {

Logincontext = NULL;

Loginform = NULL;

Public actionforward execute (actionmapping mapping,

Actionform form,

Httpservletrequest request,

Httpservletresponse response)

Throws exception {

Logger logger = logger. getlogger (this. getclass ());

Logger.info ("Login success ");

Return Mapping. findforward ("success ");

}

}

The log file content is as follows:

Info http-8080-Processor24 com. Nova. colimas. Web. Action. startupservlet-init colimas...

Info http-8080-Processor24 com. Nova. colimas. Web. Action. startupservlet-init security successfully

Info http-8080-Processor24 com. OVA. colimas. Web. Action. startupservlet-init Dao successfully

Info http-8080-Processor24 com. Nova. colimas. Web. Action. loginaction-login success