This is an example of how to check if a message is loggable. We are going to use a Logger with logging.Level set to WARNING and then log messages in different levels, in order to check if they are loggable. To do so, we have to:
- Create an instance of Logger, with the
getLogger(String name)API method, using as parameter the name of Class that uses the Logger. - Set the logging level to
Level.WARNING, with thesetLevel(Level newLevel)API method of the Logger. In this case logging at WARNING and all higher levels is enabled. - Use the
isLoggable(Level level)API method of the Logger for different levels, such asINFO,WARNING,SEVERE, and use the corresponding methods of the logger,info(String msg),warning(String msg),severe(String msg)to log a message in different levels. Since the level is set to WARNING in this example, only the messages that are logged to WARNING and above will be logged.
Let’s take a look at the code snippet that follows:
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | package com.javacodegeeks.snippets.core;import java.util.logging.Logger;import java.util.logging.Level; public class LoggingLevelCheckExample { public static void main(String[] args) { // Create an instance of Logger and set the logging level to Level.WARNING. Logger log = Logger.getLogger(LoggingLevelCheckExample.class.getName()); log.setLevel(Level.WARNING); // Log INFO level message if (log.isLoggable(Level.INFO)) {log.info("Application Info Message"); } // Log WARNING level message when Level.WARNING is loggable. if (log.isLoggable(Level.WARNING)) {log.warning("Application Warning Information"); } // Log SEVERE level message when Level.SEVERE is loggable. if (log.isLoggable(Level.SEVERE)) {log.severe("Info Severe Information"); } }} |
Output:
Αυγ 12, 2012 2:01:54 ΜΜ com.javacodegeeks.snippets.core.LoggingLevelCheckExample main
WARNING: Application Warning Information
Αυγ 12, 2012 2:01:54 ΜΜ com.javacodegeeks.snippets.core.LoggingLevelCheckExample main
SEVERE: Info Severe Information
This was an example of how to check if a message is loggable in Java.
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