Log4j日志文件存放到项目目录下

方法一：直接在log4j配置中写绝对路劲

方法二：新建一个ServletContextListener的实现类Log4jConfigListener，Log4jConfigListener做：

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1. String path = Environment.class.getResource("").getPath();  
2. String webAppPath = path.substring(0, path.toUpperCase().lastIndexOf("WEB-INF/")).replaceAll("%20", " ");  
3. System.setProperty("webapp",webAppPath + "logs/log.log");  

在log4j配置中：

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1. log4j.appender.A2.File=${webapp}/logs/log.log  

方法三（跟Spring集成）：在web.xml中配置

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1. <context-param>  
2.         <param-name>webAppRootKey</param-name>    
3.         <param-value>webapp.root</param-value>    
4.     </context-param>   
5.     <context-param>  
6.                 <param-name>log4jConfigLocation</param-name>  
7.                 <param-value>/WEB-INF/config/log4j.properties</param-value>  
8.     </context-param>   
9.     <context-param>  
10.                 <param-name>log4jRefreshInterval</param-name>  
11.                 <param-value>6000</param-value>  
12.     </context-param>  
13.     <listener>  
14.                <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>  
15.     </listener>  

然后在log4j中用上述配置的webAppRootKey对应的值

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1. log4j.appender.file.File=${webapp.root}/WEB-INF/logs/log.log