import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.Filter;
import org.apache.logging.log4j.core.config.Configurator;
import org.apache.logging.log4j.core.config.LoggerConfig;
public class Log4jFilterExample {
private static final Logger logger = LogManager.getLogger(Log4jFilterExample.class);
public static void main(String[] args) {
Configurator.setLevel(Log4jFilterExample.class.getName(), Level.INFO);
Filter levelFilter = Filter.createFilter("level-match", Filter.Result.ACCEPT, Filter.Result.DENY);
levelFilter.start();
levelFilter.addAttribute("levelToMatch", Level.WARN.toString());
LoggerConfig loggerConfig = LogManager.getContext(false).getConfiguration().getLoggerConfig(logger.getName());
loggerConfig.addFilter(levelFilter);
Configurator.reconfigure();
logger.trace("This is a TRACE message.");
logger.debug("This is a DEBUG message.");
logger.info("This is an INFO message.");
logger.warn("This is a WARN message.");
logger.error("This is an ERROR message.");
logger.fatal("This is a FATAL message.");
}
}
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.config.Configurator;
import org.apache.logging.log4j.core.layout.PatternLayout;
public class Log4jLayoutExample {
private static final Logger logger = LogManager.getLogger(Log4jLayoutExample.class);
public static void main(String[] args) {
Configurator.setLayout(Log4jLayoutExample.class.getName(), PatternLayout.createLayout(
"%d{yyyy-MM-dd HH:mm:ss} [%t] %-5level %logger{36} - %msg%n", null, null, null, null));
logger.info("This is an example of a custom log layout.");
}
}
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss} [%t] %-5level %logger{36} - %msg%n"/>
<Filters>
<ThresholdFilter level="WARN" onMatch="ACCEPT" onMismatch="NEUTRAL"/>
</Filters>
</Console>
</Appenders>
<Loggers>
<Root level="INFO">
<AppenderRef ref="Console"/>
</Root>
</Loggers>
</Configuration>
