log4j升级到log4j2

2022-12-01,,

log4j升级到log4j2

1、导入依赖

log4j2应尽量使用同一版本,否则可能出现不兼容的情况

<!-- log4j2 start -->
<!-- log4j-1.2-api必须放在最前面,否则出错 -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-1.2-api</artifactId>
<version>2.9.1</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-web</artifactId>
<version>2.9.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.9.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-api -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.9.1</version>
</dependency>
<!-- log4j2 end -->

2、log4j.properties升级为log4j2.properties

log4j2支持log4j2.properties配置文件

status = warn
name = MyApp

#指定输出源‘类型’为控制台
appender.console.type = Console
appender.console.name = consoleLogDemo
appender.console.filter.threshold.type = ThresholdFilter
appender.console.filter.threshold.level = debug
appender.console.layout.type = PatternLayout
appender.console.layout.pattern = [%-5p] [%d{yyyy-MM-dd HH:mm:ss}] [%C{1}:%M:%L] %m%n
appender.console.target = System_out

appender.rolling.type = RollingFile
appender.rolling.name = fileLogDemo
appender.rolling.filter.threshold.type = ThresholdFilter
appender.rolling.filter.threshold.level = info
appender.rolling.layout.type = PatternLayout
appender.rolling.layout.pattern = [%-5p] [%d{yyyy-MM-dd HH:mm:ss}] [%C{1}:%M:%L] %m%n
appender.rolling.append = true
appender.rolling.fileName =/data/logs/workflow/web.log
appender.rolling.filePattern=/data/logs/wokflow/web.log.%d{yyyy-MM-dd}
appender.rolling.policies.type = Policies
appender.rolling.policies.time.type = TimeBasedTriggeringPolicy
appender.rolling.policies.time.interval = 2
appender.rolling.policies.time.modulate = true
appender.rolling.policies.size.type = SizeBasedTriggeringPolicy
appender.rolling.policies.size.size=100MB
appender.rolling.strategy.type = DefaultRolloverStrategy
appender.rolling.strategy.max = 5


logger.rolling.name = com.iqiyi
logger.rolling.level = info
logger.rolling.additivity = false
logger.rolling.appenderRef.rolling.ref = fileLogDemo

#指明根级日志的级别
rootLogger.level = info
#指定哪些appender输出源是根级日志的输出级别
rootLogger.appenderRef.consolelogdemo.ref = consoleLogDemo
rootLogger.appenderRef.filelogdemo.ref = fileLogDemo

参考文档:

[log4j2中的properties配置文件]  http://www.360doc.com/content/18/0628/10/339365_766029208.shtml 
[log4j 2.x 版本的 properties 配置]  https://www.cnblogs.com/chensuqian/p/10419218.html 
[升级log4j 2.x版本 缓存异步化配置解读]  https://www.iteye.com/blog/zl378837964-2359382 
[旧web项目log4j日志升级至log4j2【从servlet2.x版本升级】]  https://blog.csdn.net/leixingbang1989/article/details/86518061 

3、log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration status="error" monitorInterval="30">
<Properties>
<Property name="baseDir">log</Property>
</Properties>
<!--先定义所有的appender-->
<appenders>
<!--这个输出控制台的配置-->
<Console name="Console" target="SYSTEM_OUT">
<!--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="trace" onMatch="ACCEPT" onMismatch="DENY"/>
<PatternLayout pattern="%d %5p %c:%L - %m %throwable{}%n"/>
</Console>
<!--异步日志配置,指向配置引用AppenderRef-->
<Async name="ASYNC" bufferSize="262144" includeLocation="true">
<AppenderRef ref="RollingFile"/>
</Async>
<!--日志文件配置,filePattern为日志文件名称的格式-->
<RollingFile name="RollingFile" fileName="${baseDir}/info.log" filePattern="${baseDir}/info.log.%d{yyyy-MM-dd}">
<!--日志内容格式-->
<PatternLayout pattern="%d %5p %c:%L - %m %throwable{separator( --> )}%n"/>
<!--依据时间创建新的日志文件:1d-->
<TimeBasedTriggeringPolicy interval="1"/>
<DefaultRolloverStrategy>
<!-- 在轮转时,删除7天之前的,命名符合规则的文件 -->
<Delete basePath="${baseDir}">
<IfFileName glob="info.log.*"/>
<IfLastModified age="7d"/>
</Delete>
</DefaultRolloverStrategy>
</RollingFile>
</appenders>
<!--然后定义logger,只有定义了logger并引入的appender,appender才会生效-->
<loggers>
<root level="INFO">
<appender-ref ref="Console"/>
<appender-ref ref="RollingFile"/>
</root>
<!--这里配置 过滤日志 -->
<logger name="org.hibernate.validator" level="ERROR"/>
</loggers>
</configuration>

4、修改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">
<!--日志升级开始-->
<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>
<!--日志升级结束-->

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

使用的LogManager.getLogger(Object.class)方式获取对象

加入测试类,并运行。如在项目磁盘目录下正常输出日志内容则说明log4j2添加成功:

public class TestLogger {
private static final Logger log = LoggerFactory.getLogger(TestLogger.class);
public static void main(String[] args) {
int number=10;
log.info("AAAAAAAAAAInfo : number is " + number);
log.warn("AAAAAAAAAAAAAAAWarning : number is " + number);
log.debug("AAAAAAAAADebug : number is " + number);
log.error("AAAAAAAAAAAError : number is " + number);

}
}

log4j升级到log4j2的相关教程结束。

《log4j升级到log4j2.doc》

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