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());
// ...
}
...
}