log4j的使用中问题

Question

我想把log4j的输出日志文件放到项目名称/WEB-INF/logs/output.log文件中 但是路径一直不对 我按照网上的办法，如下

public class Log4jInit extends HttpServlet {
    public void init(ServletConfig config) throws ServletException {
        String home = config.getServletContext().getRealPath("/");
        System.setProperty("web_home",home);
    }
}

这样配置但是会输入到eclipse所在目录的logs/output.log文件里面~~

输出的信息如下

Java code

2012-04-21   23:23:42   [com.opensymphony.xwork2.config.providers.XmlConfigurationProvider]-[INFO]   Parsing configuration file [struts-default.xml]
 2012-04-21   23:23:42   [com.opensymphony.xwork2.config.providers.XmlConfigurationProvider]-[INFO]   Parsing configuration file [struts-plugin.xml]
 2012-04-21   23:23:42   [com.opensymphony.xwork2.config.providers.XmlConfigurationProvider]-[INFO]   Parsing configuration file [struts.xml]
 2012-04-21   23:23:42   [com.opensymphony.xwork2.config.impl.DefaultConfiguration]-[INFO]   Overriding property struts.i18n.reload - old value: false new value: true  2012-04-21   23:23:42   [com.opensymphony.xwork2.config.impl.DefaultConfiguration]-[INFO]   Overriding property struts.configuration.xml.reload - old value: false new value: true  2012-04-21   23:23:44   [com.opensymphony.xwork2.ognl.OgnlValueStack]-[WARN]   Could not find property [struts.actionMapping]
 2012-04-21   23:23:44   [com.opensymphony.xwork2.ognl.OgnlValueStack]-[WARN]   Could not find property [org.apache.catalina.jsp_file]
 2012-04-21   23:23:50   [com.opensymphony.xwork2.ognl.OgnlValueStack]-[WARN]   Could not find property [struts.actionMapping]
 2012-04-21   23:23:50   [com.opensymphony.xwork2.ognl.OgnlValueStack]-[WARN]   Could not find property [struts.valueStack]
 2012-04-21   23:23:50   [com.hebeu.card.sys.action.user.UserAction]-[INFO]   info登录登录登录登录登录登录登录登录登录登录登录
…………………………………………

但是我只想让他记录 
   
   
   

    
    
    

     
     
     Java code
    
    
    
    
    
    

     
     
     
      
      
      
       
       
        
       
       
       2012
       
       
       -
       
       
       04
       
       
       -
       
       
       21
       
       
          
       
       
       23
       
       
       :
       
       
       23
       
       
       :
       
       
       50
       
       
          [com.hebeu.card.sys.action.user.UserAction]
       
       
       -
       
       
       [INFO]   info登录登录登录登录登录登录登录登录登录登录
              

Answer 1

单纯的log4j没办法了，不能指定那些类出日志，只按level级别的话无解，info是低于warn的，所以warn的信息必出，换logback吧。