A simple java global custom logger

	A simple java global custom logger Webneurons Web 3 \| Java				Site written by John Middlemas

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Java - Java is used to build the webneurons system. Apache and PHP are not needed since the system will include a server and the webneurons should replace PHP.

A simple java global custom logger. Source code for a basic java logger that just prints text to rotated log files. The logger can be called from any class in one line just like System.out.println().

The default java logging logger will send the log messages to System.out i.e. the console, and in a more complex format than you may want. You can redirect the output to a file but the default format is then XML. The below code allows you to send Log text messages that you choose to a file and nothing more.

You can send the log messages from any class anywhere by using Log.out("your message"); This is just like System.out.println("your message"); and uses a static method out() of the class Log.

You set the custom logger up once only at the start of the program using Log.setLog();

The logs will rotate 8 logs in total but you can change the total easily. The logs go to the user.home folder which you setup at the start using Settings.userHome("Your folder");

Log class
---------

import java.util.logging.*;

class Log {
static Logger logg;

static void setLog() {
// Use at the start of the program e.g. Log.setLog();
logg = Logger.getLogger(Log.class.getName());
try { 
   // log files like test0.log, test1.log etc rotated
   // 8 log files. 5000 bytes max per file.
   Handler han = new FileHandler("%h/test%g.log",5000,8);
   // Use the plain text custom formatter. see below.
   Formatter sim = new ShortFormatter();
   han.setFormatter(sim);
   logg.addHandler(han);
   // Request that every detail gets logged.
   logg.setLevel(Level.ALL);
}
catch (Exception e) {
   System.out.println(e);
}
}

static void out(String txt) {
// Write txt to the LOG e.g. Log.out("msg"); from any class
logg.fine(txt);
}

static void out(Object obj) {
// Method. Write txt to the LOG
String txt = obj.toString();
logg.fine(txt);
}

} // end class Log

class ShortFormatter extends Formatter {

public String format(LogRecord record) {
// Use a different format(logging.LogRecord) method
String res = record.getMessage() + "\r\n";
return res;
}

} // end class ShortFormatter

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