log4j升级到log4j2

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);
​
    }
}