log4j2日志

log4j2.xmllog4j-api-2.5.jarlog4j-core-2.5.jar

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE xml>

<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"/>

</Console>

<File name="log" fileName="logs.log" append="false">

<PatternLayout pattern="%d{YYYY-MM-dd HH:mm:ss.SSS} %-5level %class{36} %L %M - %msg%xEx%n"/>

</File>

</Appenders>

<Loggers>

<Logger name="com.dbyl.libarary.utils.Log" level="all">

<AppenderRef ref="Console"/>

<AppenderRef ref="log"/>

</Logger>

<Root level="trace">

<AppenderRef ref="Console"/>

<AppenderRef ref="log"/>

</Root>

</Loggers>

</Configuration>

@WebServlet(urlPatterns = "/HomeServlet",asyncSupported=true)

public class HomeServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

private static final Logger LOGGER = LogManager.getLogger(HomeServlet.class);

public static void main(String[] args) {

LOGGER.info("--------------info------------------"+HomeServlet.class);

}

public void testLog() {

LOGGER.trace("Trace Message!");

LOGGER.debug("Debug Message!");

LOGGER.info("Info Message!");

LOGGER.warn("Warn Message!");

LOGGER.error("Error Message!");

LOGGER.fatal("Fatal Message!");

LOGGER.info("--------------info------------------"+HomeServlet.class.getName());

LOGGER.info("--------------info------------------"+HomeServlet.class);

LOGGER.debug("------------debug--------------------");

LOGGER.fatal("---------------fatal-----------------");

LOGGER.info("--------------------------------");

getLogger(Bar.class.getName())

getLogger(MyAPP.class) //官方推荐的写法

getLogger("HomeServlet")

getLogger()

public class MyService {

// instead of Logger logger = LogManager.getLogger(MyService.class):

private static final ExtLogger logger = ExtLogger.create(MyService.class);

public void demoExtendedLogger() {

// ...

logger.trace("the built-in TRACE level");

logger.verbose("a custom level: a VERBOSE message");

logger.debug("the built-in DEBUG level");

logger.notice("a custom level: a NOTICE message");

logger.info("the built-in INFO level");

logger.diag("a custom level: a DIAG message");

logger.warn("the built-in WARN level");

logger.error("the built-in ERROR level");

logger.fatal("the built-in FATAL level");

logger.notice("java 8 lambda expression only executed if NOTICE is enabled: {}", () -> someMethod());

// ...

}

...

}