4.Spring中使用Log4j

转自：https://blog.csdn.net/luohai859/article/details/52250807

这里要实现web项目中利用Spring来使用Log4j

（1）接上面的工程，然后再导入Spring的包

（2）web.xml增加

 <!-- 设置根目录 -->

    <context-param>

        <param-name>webAppRootKey</param-name>

        <param-value>webapp.root</param-value>

    </context-param>

    <context-param>

     <param-name>log4jConfigLocation</param-name>

     <param-value>/WEB-INF/classes/log4j.properties</param-value>

 </context-param>

 <!-- 3000表示 开一条watchdog线程每60秒扫描一下配置文件的变化;这样便于日志存放位置的改变 -->

 <context-param>

         <param-name>log4jRefreshInterval</param-name>

         <param-value>3000</param-value>

    </context-param>

 <listener>

     <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>

 </listener>

整个内容如下：

 <?xml version="1.0" encoding="UTF-8"?>

 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

     xmlns="http://java.sun.com/xml/ns/javaee"

     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"

     id="WebApp_ID" version="3.0">

     <display-name>LogLearning</display-name>

     <servlet>

         <servlet-name>Log4JTestServlet</servlet-name>

         <servlet-class>com.mucfc.Log4JTestServlet</servlet-class>

     </servlet>

     <!--用来启动 log4jConfigLocation的servlet -->

 <!--     <servlet>

         <servlet-name>Log4JInitServlet</servlet-name>

         <servlet-class>com.mucfc.Log4JInitServlet</servlet-class>

         <init-param>

             <param-name>log4j-properties-location</param-name>

             <param-value>/WEB-INF/classes/log4j.properties</param-value>

         </init-param>

         <load-on-startup>1</load-on-startup>

     </servlet>-->

     <servlet-mapping>

         <servlet-name>Log4JTestServlet</servlet-name>

         <url-pattern>/test</url-pattern>

     </servlet-mapping>

         <!-- Spring 容器加载 -->

     <listener>

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

     </listener>

     <context-param>

         <param-name>contextConfigLocation</param-name>

         <param-value>classpath:applicationContext.xml</param-value>

     </context-param>

     <!-- 设置根目录 -->

     <context-param>

         <param-name>webAppRootKey</param-name>

         <param-value>webapp.root</param-value>

     </context-param>

     <context-param>

         <param-name>log4jConfigLocation</param-name>

         <param-value>/WEB-INF/classes/log4j.properties</param-value>

     </context-param>

     <!-- 3000表示 开一条watchdog线程每60秒扫描一下配置文件的变化;这样便于日志存放位置的改变 -->

     <context-param>

          <param-name>log4jRefreshInterval</param-name>

          <param-value>3000</param-value>

     </context-param>

     <listener>

         <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>

     </listener>

 </web-app>

这里Log4JInitServlet.java就相当于没用到了。

（2）applicationContext.xml

没有内容：

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"

    xmlns:aop="http://www.springframework.org/schema/aop"

    xsi:schemaLocation="

http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-3.2.xsd

http://www.springframework.org/schema/aop

http://www.springframework.org/schema/aop/spring-aop-3.2.xsd

http://www.springframework.org/schema/context

           http://www.springframework.org/schema/context/spring-context-3.2.xsd">

</beans>

（3）这样日志就跟随Spring窗口启动而启动了

程序一运行，就会自动把日志打印

log.log

error.log为空，因为它只打印error级别以上的信息

浏览器输入http://localhost:8080/LogLearning2/test

然后打开文件