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<dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>2.13.3</version></dependency><dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>2.13.3</version></dependency>

import org.apache.logging.log4j.LogManager;import org.apache.logging.log4j.Logger;

/** * @Auther: csh * @Date: 2020/7/26 14:17 * @Description:纯log4j2打印 */public class Log4j2App { private static final Logger logger = LogManager.getLogger(LogManager.ROOT_LOGGER_NAME);
 public static void main(String[] args) { logger.trace("trace message"); logger.debug("debug message"); logger.info("info message"); logger.warn("warn message"); logger.error("error message"); logger.fatal("fatal message"); }}

ERROR StatusLogger No log4j2 configuration file found. Using default configuration: logging only errors to the console.15:22:53.174 [main] ERROR - error message15:22:53.176 [main] FATAL - fatal message

<?xml version="1.0" encoding="UTF-8"?><Configuration status="WARN"> <Appenders> <Console name="Console" target="SYSTEM_OUT"> <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" /> </Console> </Appenders>
 <Loggers> <Root level="info"> <AppenderRef ref="Console" /> </Root> </Loggers></Configuration>

/** * @Auther: csh * @Date: 2020/7/29 15:58 * @Description:通过java读取配置文件 */public class SimpleXmiLog4j { public static void main(String[] args) throws Exception{ //TODO 注意该路基在每台电脑上面可能不一样！ File file =new File("D:\\ideaWorkSpace\\spring\\src\\main\\resources\\log4j\\simple-log4j.xml"); BufferedInputStream in = new BufferedInputStream(new FileInputStream(file)); final ConfigurationSource source = new ConfigurationSource(in); Configurator.initialize(null, source); Logger logger = LogManager.getLogger("myLogger"); logger.trace("trace message"); logger.debug("debug message"); logger.info("info message"); logger.warn("warn message"); logger.error("error message"); logger.fatal("fatal message"); }}

15:59:59.491 [main] INFO myLogger - info message15:59:59.494 [main] WARN myLogger - warn message15:59:59.495 [main] ERROR myLogger - error message15:59:59.495 [main] FATAL myLogger - fatal message

<dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>2.13.3</version></dependency><dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-web</artifactId> <version>2.13.3</version></dependency>

<?xml version="1.0" encoding="UTF-8"?><Configuration status="WARN"> <Appenders> <Console name="Console" target="SYSTEM_OUT"> <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" /> </Console> </Appenders>
 <Loggers> <!--将系统打印所有日志--> <Logger name="com.hong" level="DEBUG"> <AppenderRef ref="Console" /> </Logger> <Logger name="org.springframework" level="info"> <AppenderRef ref="Console" /> </Logger> <Root level="debug"> <!--这儿为trace表示什么都可以打印出来了,其他几个级别分别为：TRACE、DEBUG、INFO、WARN、ERROR和FATAL --> <AppenderRef ref="Console" /> </Root> </Loggers></Configuration>

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1" metadata-complete="true"> <display-name>Spring MVC Application</display-name>
 <context-param> <param-name>log4jConfiguration</param-name> <param-value>classpath:log4j/simple-log4j.xml</param-value> </context-param> <!-- log4j2-begin --> <listener> <listener-class>org.apache.logging.log4j.web.Log4jServletContextListener</listener-class> </listener> <filter> <filter-name>log4jServletFilter</filter-name> <filter-class>org.apache.logging.log4j.web.Log4jServletFilter</filter-class> </filter> <filter-mapping> <filter-name>log4jServletFilter</filter-name> <url-pattern>/*</url-pattern> <dispatcher>REQUEST</dispatcher> <dispatcher>FORWARD</dispatcher> <dispatcher>INCLUDE</dispatcher> <dispatcher>ERROR</dispatcher> </filter-mapping> <!-- log4j2-end -->

 <servlet> <servlet-name>HelloWeb</servlet-name> <servlet-class> org.springframework.web.servlet.DispatcherServlet </servlet-class> <load-on-startup>1</load-on-startup> </servlet>
 <servlet-mapping> <servlet-name>HelloWeb</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping></web-app>

@Controller@RequestMapping("/")public class HomeController { private static Logger log = LogManager.getLogger(HomeController.class.getName());
 @RequestMapping(value = "",method = RequestMethod.GET) public String home(ModelMap model) { log.info("进入了首页！"); model.addAttribute("message","Hello home"); return "home"; }
}

14:45:28.468 [http-nio-80-exec-1] INFO com.hong.spring.mvc.controller.HomeController - 进入了首页！14:45:28.468 [http-nio-80-exec-1] INFO com.hong.spring.mvc.controller.HomeController - 进入了首页！14:45:29.143 [http-nio-80-exec-2] INFO com.hong.spring.mvc.controller.HomeController - 进入了首页！14:45:29.143 [http-nio-80-exec-2] INFO com.hong.spring.mvc.controller.HomeController - 进入了首页！14:45:29.473 [http-nio-80-exec-3] INFO com.hong.spring.mvc.controller.HomeController - 进入了首页！14:45:29.473 [http-nio-80-exec-3] INFO com.hong.spring.mvc.controller.HomeController - 进入了首页！

<?xml version="1.0" encoding="UTF-8"?><!--日志级别以及优先级排序: OFF > FATAL > ERROR > WARN > INFO > DEBUG > TRACE > ALL --><!--Configuration后面的status，这个用于设置log4j2自身内部的信息输出，可以不设置，当设置成trace时，你会看到log4j2内部各种详细输出--><!--monitorInterval：Log4j能够自动检测修改配置 文件和重新配置本身，设置间隔秒数--><Configuration status="WARN" monitorInterval="30"> <!--全局属性--> <Properties> <Property name="APP_NAME">spring</Property> <!--设置日志文件存储路径为tomcat/logs/${APP_NAME}--> <Property name="LOG_FILE_PATH">D:/logs/${APP_NAME}</Property> <!--<Property name="LOG_FILE_PATH">./logs/${APP_NAME}</Property>--> <!--设置日志输出格式--> <Property name="PATTERN_FORMAT">%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level %class{36} %L %M - %msg%xEx%n</Property> </Properties> <!--配置输出源--> <Appenders> <!--输出到控制台--> <Console name="Console" target="SYSTEM_OUT"> <PatternLayout pattern="${PATTERN_FORMAT}"/> </Console>

 <File name="applicationLog" fileName="${LOG_FILE_PATH}/MyTestLog.txt" immediateFlush="false" append="true"> <PatternLayout pattern="%d{yy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" /> </File>
 <!--输出info日志到文件，filePattern旧日志另存文件名--> <RollingFile name="RollingInfoFile" fileName="${LOG_FILE_PATH}/info.log" filePattern="${LOG_FILE_PATH}/$${date:yyyyMM}/info-%d{yyyyMMdd}-%i.log.gz"> <!--控制台只输出level及以上级别的信息（onMatch），其他的直接拒绝（onMismatch）--> <Filters> <ThresholdFilter level="warn" onMatch="DENY" onMismatch="NEUTRAL"/> <ThresholdFilter level="info" onMatch="ACCEPT" onMismatch="DENY"/> </Filters>
 <PatternLayout> <pattern>${PATTERN_FORMAT}</pattern> </PatternLayout>
 <Policies> <!-- rollover on startup, daily and when the file reaches 10 MegaBytes --> <!--当系统重启/日期更新/超过100M将会覆盖文件--> <OnStartupTriggeringPolicy/> <SizeBasedTriggeringPolicy size="100 MB"/> <TimeBasedTriggeringPolicy/> </Policies> </RollingFile>
 <!--输出警告日志到文件--> <RollingFile name="RollingWarnFile" fileName="${LOG_FILE_PATH}/warn.log" filePattern="${LOG_FILE_PATH}/$${date:yyyyMM}/warn-%d{yyyyMMdd}-%i.log.gz"> <!--控制台只输出level及以上级别的信息（onMatch），其他的直接拒绝（onMismatch）--> <Filters> <ThresholdFilter level="error" onMatch="DENY" onMismatch="NEUTRAL"/> <ThresholdFilter level="warn" onMatch="ACCEPT" onMismatch="DENY"/> </Filters>
 <PatternLayout> <pattern>${PATTERN_FORMAT}</pattern> </PatternLayout>
 <Policies> <!-- rollover on startup, daily and when the file reaches 10 MegaBytes --> <OnStartupTriggeringPolicy/> <SizeBasedTriggeringPolicy size="100 MB"/> <TimeBasedTriggeringPolicy/> </Policies> </RollingFile>
 <!--输出错误日志到文件--> <RollingFile name="RollingErrorFile" fileName="${LOG_FILE_PATH}/error.log" filePattern="${LOG_FILE_PATH}/$${date:yyyyMM}/error-%d{yyyyMMdd}-%i.log.gz"> <!--控制台只输出level及以上级别的信息（onMatch），其他的直接拒绝（onMismatch）--> <ThresholdFilter level="error" onMatch="ACCEPT" onMismatch="DENY"/>
 <PatternLayout> <pattern>${PATTERN_FORMAT}</pattern> </PatternLayout>
 <Policies> <!-- rollover on startup, daily and when the file reaches 10 MegaBytes --> <OnStartupTriggeringPolicy/> <SizeBasedTriggeringPolicy size="100 MB"/> <TimeBasedTriggeringPolicy/> </Policies> </RollingFile> </Appenders>
 <Loggers> <!--过滤掉spring和mybatis的一些无用的DEBUG信息--> <Logger name="org.springframework" level="INFO"/> <Logger name="org.mybatis" level="INFO"/> <Logger name="com.hong.spring" level="info" additivity="true"> <appender-ref ref="applicationLog" /> </Logger>
 <!-- LOG everything at INFO level --> <Root level="ALL"> <AppenderRef ref="applicationLog" /> <AppenderRef ref="Console"/> <AppenderRef ref="RollingInfoFile"/> <AppenderRef ref="RollingWarnFile"/> <AppenderRef ref="RollingErrorFile"/> </Root> </Loggers></Configuration>

<context-param> <param-name>log4jConfiguration</param-name> <!--简单配置--> <!--<param-value>classpath:log4j/simple-log4j.xml</param-value>--> <!--较全配置--> <param-value>classpath:log4j/log4j2-now.xml</param-value></context-param>

[2020-07-31 03:17:39,714] Artifact spring:war: Artifact is deployed successfully[2020-07-31 03:17:39,714] Artifact spring:war: Deploy took 6,880 milliseconds2020-07-31 15:17:40.019 INFO com.hong.spring.mvc.controller.HomeController 17 home - 进入了首页！2020-07-31 15:17:40.041 ERROR com.hong.spring.mvc.controller.HomeController 18 home - error进入了首页！2020-07-31 15:17:40.649 INFO com.hong.spring.mvc.controller.HomeController 17 home - 进入了首页！2020-07-31 15:17:40.650 ERROR com.hong.spring.mvc.controller.HomeController 18 home - error进入了首页！2020-07-31 15:17:40.933 INFO com.hong.spring.mvc.controller.HomeController 17 home - 进入了首页！2020-07-31 15:17:40.934 ERROR com.hong.spring.mvc.controller.HomeController 18 home - error进入了首页！