Log4j

How To write Log4J in our application?
In Log4j there are Appender, Layouts,Levels
 Appenders:Console,File,Jdbc,SMTP......
Layouts:Simple, Pattern,Date,Html,Xml
Levels:DEBUG,FATAL,WARN,INFO,ERROR
STEP:1
 Write a property file and place under src folder. and in D or C drive as your wish.
 For example com.blog.bhaskar.log4j.properties
  Log4J.rootLogger=debug,info,myAppender1
  Log4J.appender.myAppender1=org.apache.log4J.Fileappender
  Log4J.appender.myAppender1.File=c://text.html
  Log4J.appender.myAppender1.Layout=org.apache.log4j.SimpleLayout
  Log4J.appender.myAppender1.Layout=org.apache.log4j.HTMLLayout.

STEP:2
Write a log4j class and place in utili package
  public class Log4jutility{
  public static Logger testLogger=null;
     static{
       try{
         Properties p=new Properties();
         p.load(new FileInputStream(c://log4j.properties));
        PropertyConfigurator.configure(p);
}
    catch(Exception e)
{
testLogger=Logger.getLogger(Log4jUtility.class);
 testLogger.fatal("log4j is not configure");
 e.printStackTrace();
  }
    }
        public static void logInfoMessage(class objclass, String sMessage){
        testLogger=Logger.getLogger(objclass);
        testLogger.info(sMessage);
 }
  public static void logErrorMessage(class objclass, String sMessage){
        testLogger=Logger.getLogger(objclass);
        testLogger.info(sMessage);

 }
  public static void logFatalMessage(class objclass, String sMessage){
        testLogger=Logger.getLogger(objclass);
        testLogger.info(sMessage);

 }
  public static void logDebugMessage(class objclass, String sMessage){
        testLogger=Logger.getLogger(objclass);
        testLogger.info(sMessage);

 }
  public static void logWarnMessage(class objclass, String sMessage){
        testLogger=Logger.getLogger(objclass);
        testLogger.info(sMessage);

 }


}
Step:3
For example if you want to use log4j in your class means (form,actionclass,daoimpl any where) follow the below example.

Take a class provide log4j.
 public class Lo4jDemo{

public static void main(String[] args)
{
Log4jUtility.logInfoMessage(Log4jDemo.class,"information");
 Log4jUtility.logErroeMessage(Log4jDemo.class,"information"); Log4jUtility.logDebugMessage(Log4jDemo.class,"information"); Log4jUtility.logFatalMessage(Log4jDemo.class,"information");
}
}

NOTE:The output of logger message will be displayed in c://text.html(configured in log4j properties) location in the form of  file Layout and an HTML Layout is created automatically in C://text.html

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