import org.apache.log4j.Hierarchy; //导入依赖的package包/类
LoggerRepository configureHierarchy(InetAddress inetAddress) {
   cat.info("Locating configuration file for "+inetAddress);
   // We assume that the toSting method of InetAddress returns is in
   // the format hostname/d1.d2.d3.d4 e.g. torino/192.168.1.1
   String s = inetAddress.toString();
   int i = s.indexOf("/");
   if(i == -1) {
     cat.warn("Could not parse the inetAddress ["+inetAddress+
       "]. Using default hierarchy.");
     return genericHierarchy();
   } else {
     String key = s.substring(0, i);

     File configFile = new File(dir, key+CONFIG_FILE_EXT);
     if(configFile.exists()) {
Hierarchy h = new Hierarchy(new RootLogger(Level.DEBUG));
hierarchyMap.put(inetAddress, h);

new PropertyConfigurator().doConfigure(configFile.getAbsolutePath(), h);

return h;
     } else {
cat.warn("Could not find config file ["+configFile+"].");
return genericHierarchy();
     }
   }
 }
 

import org.apache.log4j.Hierarchy; //导入依赖的package包/类
public static synchronized void init(ServletContext servletContext)
        throws ServletException {
    if (!initialized) // set the global RepositorySelector
    {
        defaultRepository = LoggerFactory.getLoggerRepository();
        RepositorySelector theSelector = new AppRespositorySelector();
        LogManager.setRepositorySelector(theSelector, guard);
        initialized = true;
    }

    Hierarchy hierarchy = new Hierarchy(new RootLogger(Level.DEBUG));
    loadLog4JConfig(servletContext, hierarchy);
    ClassLoader loader = Thread.currentThread().getContextClassLoader();
    repositories.put(loader, hierarchy);
}
 

import org.apache.log4j.Hierarchy; //导入依赖的package包/类
private static void loadLog4JConfig(ServletContext servletContext,
        Hierarchy hierarchy) throws ServletException {
    try {
        String log4jFile = "/WEB-INF/log4j.xml";
        InputStream log4JConfig = servletContext.getResourceAsStream(log4jFile);
        Document doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(log4JConfig);
        DOMConfigurator conf = new DOMConfigurator();
        conf.doConfigure(doc.getDocumentElement(), hierarchy);
    } catch (Exception e) {
        throw new ServletException(e);
    }
}