I go it:
import java.nio.file.Paths;
import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.Appender;
import org.apache.logging.log4j.core.LoggerContext;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.LoggerConfig;
public class Log4j2Init {
private String logPath;
// -------------------------------------------------------
// CONSTRUCTOR
// -------------------------------------------------------
/**
* Initialize Log4j2
* Configure log path which will be used in "log4j2.xml"
* Common error is caused by the static logger
* If you logs before the System.setProperty, this will cause the
variable
UNDEFINED error.
* private static final Logger logger =
LogManager.getLogger(test.class.getName());
* is forbidden here !!
*/
public Log4j2Init() {
logPath = Paths.get(getUserAppDirectory()+"/Pac-Tool").toString();
System.setProperty("logpath.name",logPath);
}
// -------------------------------------------------------
// TEST
// -------------------------------------------------------
public static void main(String[] args) {
Log4j2Init log4j2Init = new Log4j2Init();
System.out.println("Pat of the Log File : " +
log4j2Init.getLogPath());
// Create the Logger
Logger logger =
LogManager.getLogger(Log4j2Init.class.getName());
@SuppressWarnings("resource")
LoggerContext ctx = (LoggerContext)
LogManager.getContext(false);
Configuration config = ctx.getConfiguration();
LoggerConfig loggerConfig =
config.getLoggerConfig(LogManager.ROOT_LOGGER_NAME);
// Read the Appenders
System.out.println("Appenders declared in .xml :" +
loggerConfig.getAppenderRefs());
System.out.println("Appenders used in Logger :" +
loggerConfig.getAppenders());
// Apply the level specified in log4j2.xml
System.out.println("Log Level (default in .xml)= " +
loggerConfig.getLevel());
logger.error("This is Logger for 1 Error");
logger.info("This is Logger for 1 Info");
logger.debug("This is Logger for 1 Debug");
logger.trace("This is Logger for 1 Trace");
// Remove Console Logger + Set new log level
loggerConfig.removeAppender("Console");
loggerConfig.setLevel(Level.TRACE);
ctx.updateLoggers();
System.out.println("Log Level = " + loggerConfig.getLevel());
System.out.println("Appenders used in Logger :" +
loggerConfig.getAppenders());
logger.error("This is Logger 2 Error");
logger.info("This is Logger 2 Info");
logger.debug("This is Logger 2 Debug");
logger.trace("This is Logger 2 Trace");
// Add Appender
Appender appender = config.getAppender("Console");
loggerConfig.addAppender(appender, Level.TRACE, null );
ctx.updateLoggers();
System.out.println("Log Level = " + loggerConfig.getLevel());
System.out.println("Appenders used in Logger :" +
loggerConfig.getAppenders());
logger.error("This is Logger 3 Error");
logger.info("This is Logger 3 Info");
logger.debug("This is Logger 3 Debug");
logger.trace("This is Logger 3 Trace");
}
/**
* getUserAppDirectory
* @return
*/
private String getUserAppDirectory() {
String workingDirectory;
String OS = (System.getProperty("os.name")).toUpperCase();
if (OS.contains("WIN"))
{
//it is simply the location of the "AppData" folder
workingDirectory = System.getenv("AppData");
}
else
{
//Otherwise, we assume Linux or Mac
workingDirectory = System.getProperty("user.home");
//if we are on a Mac, we are not done, we look for
"Application Support"
workingDirectory += "/Library/Application Support";
}
return workingDirectory;
}
public String getLogPath() {
return logPath;
}
}
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