关于Spring5.0的Log4jConfigListener过期问题

Posted 2021-01-01 chenloveslife

（转自：https://blog.csdn.net/zhiyuzhe/article/details/78850238）

升级到spring5.0，发现之前web.xml 里配置的log监听Log4jConfigListener被spring废弃了，百度了一下，没有发现答案。 
这个是web.xml之前的配置：

    <context-param> 
        <param-name>log4jConfigLocation</param-name>
        <param-value>classpath:log4j.properties</param-value>
    </context-param>
    <context-param>  
        <param-name>webAppRootKey</param-name>
        <param-value>webApp.root</param-value>
    </context-param>
    <context-param>
        <param-name>log4jRefreshInterval</param-name>
        <param-value>6000</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
    </listener> 

Spring5.0的api里已经没有这个方法了，切换到版本4.3.13，发现原文是这么说的。spring建议用log4j2 来替换这个类。以下为官方原文:

Deprecated. 
as of Spring 4.2.1, in favor of Apache Log4j 2 (following Apache‘s EOL declaration for log4j 1.x)

@Deprecated
public class Log4jConfigListener
extends java.lang.Object
implements ServletContextListener

于是看了一下log4j2，实现过程记录一下： 
首先引入全新的log4j2 依赖jar包

     <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-api</artifactId>
        <version>2.10.0</version>
    </dependency>
    <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-core</artifactId>
        <version>2.10.0</version>
    </dependency>

    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-web</artifactId>
      <version>2.9.1</version>
    </dependency>

web.xml 的配置如下

<!-- 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 -->

src/main/resources`目录下新增log4j2.xml 文件，这个文件名是官方默认的

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="OFF" monitorInterval="1800">
    <properties>
        <property name="LOG_HOME">/WEB-INF/logs</property>
        <property name="FILE_NAME">finance-pay</property>
    </properties>


    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
        </Console>

        <RollingFile name="running-log" fileName="${LOG_HOME}/${FILE_NAME}.log"
            filePattern="${LOG_HOME}/$${date:yyyy-MM}/${FILE_NAME}-%d{yyyy-MM-dd}-%i.log.gz"
            immediateFlush="true">
            <PatternLayout
                pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%file:%line] - %msg%n" />
            <Policies>
                <TimeBasedTriggeringPolicy />
                <SizeBasedTriggeringPolicy size="10 MB" />
            </Policies>
            <DefaultRolloverStrategy max="20" />
        </RollingFile>
    </Appenders>
    <Loggers>

        <!-- <Logger name="com.cssweb.test.app" level="trace" additivity="true"> 
            <AppenderRef ref="running-log" /> </Logger> -->

        <Root level="info">
               <!-- 这里是输入到文件，很重要-->
            <AppenderRef ref="running-log" />
            <!-- 这里是输入到控制台-->
            <AppenderRef ref="Console" />
        </Root>
    </Loggers>
</Configuration>

编写一个测试类：

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


public class TestLog4j2 {
     static 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");
         System.out.println("Hello World!");
     }

}