目前市面中应用的大多数是spring boot我的项目，上面我说的计划sring也实用。
在这里给大家举荐一套目前 最火的Java后端日志框架计划：
门户日志用：slf4j
日志实现用：log4j2
具体的配置或者优化如下详情
1、导入依赖
log4j2应尽量应用同一版本，否则可能呈现不兼容的状况
// log降级配置 compile('org.apache.logging.log4j:log4j-1.2-api:2.9.1') compile('org.apache.logging.log4j:log4j-web:2.9.1') compile('org.apache.logging.log4j:log4j-core:2.9.1') compile('org.apache.logging.log4j:log4j-api:2.9.1') // log // compile('log4j:log4j:1.2.17') compile('org.slf4j:slf4j-api:1.6.6') compile('org.slf4j:slf4j-log4j12:1.7.21')2、创立log4j2.properties
（如果有log4j.properties要删除的）
（上面还有一种应用log4j.xml的办法，两种任选其一，当初是偏向于用xml）
status = warnname = MyApp#指定输入源‘类型’为控制台appender.console.type = Consoleappender.console.name = consoleLogDemoappender.console.filter.threshold.type = ThresholdFilterappender.console.filter.threshold.level = debugappender.console.layout.type = PatternLayoutappender.console.layout.pattern = [%-5p] [%d{yyyy-MM-dd HH:mm:ss}] [%C{1}:%M:%L] %m%nappender.console.target = System_outappender.rolling.type = RollingFileappender.rolling.name = fileLogDemoappender.rolling.filter.threshold.type = ThresholdFilterappender.rolling.filter.threshold.level = infoappender.rolling.layout.type = PatternLayoutappender.rolling.layout.pattern = [%-5p] [%d{yyyy-MM-dd HH:mm:ss}] [%C{1}:%M:%L] %m%nappender.rolling.append = trueappender.rolling.fileName =/data/logs/workflow/web.logappender.rolling.filePattern=/data/logs/wokflow/web.log.%d{yyyy-MM-dd}appender.rolling.policies.type = Policiesappender.rolling.policies.time.type = TimeBasedTriggeringPolicyappender.rolling.policies.time.interval = 2appender.rolling.policies.time.modulate = trueappender.rolling.policies.size.type = SizeBasedTriggeringPolicyappender.rolling.policies.size.size=100MBappender.rolling.strategy.type = DefaultRolloverStrategyappender.rolling.strategy.max = 5logger.rolling.name = com.XXXlogger.rolling.level = infologger.rolling.additivity = falselogger.rolling.appenderRef.rolling.ref = fileLogDemo#指明根级日志的级别rootLogger.level = info#指定哪些appender输入源是根级日志的输入级别rootLogger.appenderRef.consolelogdemo.ref = consoleLogDemorootLogger.appenderRef.filelogdemo.ref = fileLogDemo3、log4j2.xml
<?xml version="1.0" encoding="UTF-8"?><!-- 日志级别依照从低到高为：ALL < TRACE < DEBUG < INFO < WARN < ERROR < FATAL < OFF --><!--status="WARN" :用于设置log4j2本身外部日志的信息输入级别，默认是OFF--><Configuration status="WARN" monitorInterval="30"> <!--自定义一些常量，之后应用${变量名}援用--> <properties> <property name="LOG_PATH">D:/logs</property> <property name="PATTERN" value="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] [%l] %p - %m%n%n"/> <property name="INFO_LOG">info</property> <property name="DEBUG_LOG">debug</property> <property name="ERROR_LOG">error</property> </properties> <!--appenders:定义输入内容,输入格局,输入形式,日志保留策略等,罕用其下三种标签[console,File,RollingFile]--> <Appenders> <Console name="Console" target="SYSTEM_OUT"> <ThresholdFilter level="DEBUG" onMatch="ACCEPT" onMismatch="DENY"/> <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" /> </Console> <RollingFile name="DebugAppender" fileName="${LOG_PATH}/${DEBUG_LOG}.log" filePattern="${LOG_PATH}/$${date:yyyy-MM}/debug-%d{yyyy-MM-dd}-%i.log" immediateFlush="true"> <!--控制台只输入level及以上级别的信息（onMatch），其余的间接回绝（onMismatch）--> <Filters> <ThresholdFilter level="INFO" onMatch="DENY" onMismatch="NEUTRAL"/> <ThresholdFilter level="DEBUG" onMatch="ACCEPT" onMismatch="DENY"/> </Filters> <PatternLayout pattern="${PATTERN}" /> <Policies> <TimeBasedTriggeringPolicy /> <SizeBasedTriggeringPolicy size="10 MB" /> </Policies> <!-- DefaultRolloverStrategy属性如不设置，则默认为最多同一文件夹下7个文件，这里设置了20 --> <DefaultRolloverStrategy max="20" /> </RollingFile> <RollingFile name="InfoAppender" fileName="${LOG_PATH}/${INFO_LOG}.log" filePattern="${LOG_PATH}/$${date:yyyy-MM}/info-%d{yyyy-MM-dd}-%i.log" immediateFlush="true"> <!--控制台只输入level及以上级别的信息（onMatch），其余的间接回绝（onMismatch）--> <Filters> <ThresholdFilter level="WARN" onMatch="DENY" onMismatch="NEUTRAL" /> <ThresholdFilter level="INFO" onMatch="ACCEPT" onMismatch="DENY"/> </Filters> <PatternLayout pattern="${PATTERN}" /> <Policies> <TimeBasedTriggeringPolicy /> <!-- SizeBasedTriggeringPolicy :文件大小滚动策略--> <SizeBasedTriggeringPolicy size="10 MB" /> </Policies> <!-- DefaultRolloverStrategy属性如不设置，则默认为最多同一文件夹下7个文件，这里设置了20 --> <DefaultRolloverStrategy max="20" /> </RollingFile> <RollingFile name="ErrorAppender" fileName="${LOG_PATH}/${ERROR_LOG}.log" filePattern="${LOG_PATH}/$${date:yyyy-MM}/error-%d{yyyy-MM-dd}-%i.log" immediateFlush="true"> <!--控制台只输入level及以上级别的信息（onMatch），其余的间接回绝（onMismatch）--> <Filters> <ThresholdFilter level="WARN" onMatch="ACCEPT" onMismatch="DENY"/> </Filters> <PatternLayout pattern="${PATTERN}" /> <Policies> <TimeBasedTriggeringPolicy /> <SizeBasedTriggeringPolicy size="10 MB" /> </Policies> <!-- DefaultRolloverStrategy属性如不设置，则默认为最多同一文件夹下7个文件，这里设置了20 --> <DefaultRolloverStrategy max="20" /> </RollingFile> </Appenders> <!--定义logger，只有定义了logger并引入的appender，appender才会失效--> <Loggers> <!--Logger节点用来独自指定日志的模式，name为包门路,比方要为org.springframework包下所有日志指定为ERROR级别等。 --> <logger name="org.apache.ibatis" additivity="false" level="ERROR" /> <logger name="org.apache.shiro" additivity="false" level="ERROR" /> <logger name="net.sf.ehcache" additivity="false" level="ERROR" /> <logger name="org.apache.commons" additivity="false" level="ERROR" /> <logger name="org.mybatis.spring" additivity="false" level="ERROR" /> <logger name="java.sql" additivity="false" level="ERROR" /> <logger name="org.springframework" additivity="false" level="ERROR" /> <logger name="com.alibaba.druid.filter.stat" additivity="false" level="WARN" /> <logger name="com.alibaba.druid.pool" additivity="false" level="WARN" /> <logger name="druid.sql.Connection" additivity="false" level="WARN" /> <logger name="druid.sql.DataSource" additivity="false" level="WARN" /> <logger name="druid.sql.ResultSet" additivity="false" level="WARN" /> <logger name="druid.sql.Statement" additivity="false" level="WARN" /> <!-- Root节点用来指定我的项目的根日志，如果没有独自指定Logger，那么就会默认应用该Root日志输入 --> <Root level="INFO"> <AppenderRef ref="Console" /> <AppenderRef ref="DebugAppender" /> <AppenderRef ref="InfoAppender" /> <AppenderRef ref="ErrorAppender" /> </Root> </Loggers></Configuration>如果你的我的项目中应用的是老的框架，应用的是web.xml，那还要去批改
4、批改web.xml
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <!--日志降级开始--> <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> <context-param> <param-name>log4jContextName</param-name> <param-value>myApplication</param-value> </context-param> <context-param> <param-name>log4jConfiguration</param-name> <param-value>classpath:log4j2.properties</param-value> </context-param> <!--日志降级完结-->在web.xml中移除旧的log4j.property的配置
<context-param> <param-name>log4jConfigLocation</param-name> <param-value>classpath:log4j.properties</param-value> </context-param>5、log4j2测试
应用的LogManager.getLogger(Object.class)形式获取对象
退出测试类，并运行。如在我的项目磁盘目录下失常输入日志内容则阐明log4j2增加胜利
public class TestLogger { private static final Logger log = LoggerFactory.getLogger(TestLogger.class); public static void main(String[] args) { int num=10; log.info("8888888888888888Info : numis " + num); log.warn("8888888888888888Warning : numis " + num); log.debug("8888888888888888Debug : numis " + num); log.error("8888888888888888Error : numis " + num); }}