springMVC项目中配置log4j.properties路径_springmvc 项目中 log4j properties ${web:servletcontex-优快云博客

本文介绍了如何在SpringMVC项目中不将log4j.properties打包到war包内，而是将其放在单独的配置文件夹，并在容器中设置为classpath。通过在web.xml中的配置，实现了日志配置的外部化。同时提到了log4j2的使用，包括引入依赖和日志写入数据库的示例。

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log4j.properties不打到war包中，单独写到一个存放配置文件的文件夹中，在容器中将该文件夹放入classpath，在web.xml中可以如下配置：

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext-dao.xml,classpath:SpringMVC.xml
    </param-value>
  </context-param>


  <context-param>
    <param-name>log4jConfigLocation</param-name>
    <param-value>classpath:db2client-cfg/log4j.properties</param-value>
  </context-param>

  <context-param>
    <param-name>log4jRefreshInterval</param-name>
    <param-value>60000</param-value>
  </context-param>

  <!-- 配置log4j.xml监听器-->
  <!--需要配置在 ContextLoaderListener之前-->
  <listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
  </listener>

  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

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>

<!-- 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 -->

经典大神案例：https://blog.youkuaiyun.com/smallbabylong/article/details/83475308

将日志写入到数据库：https://blog.youkuaiyun.com/qq_23543983/article/details/80687643