code: public Scans init(final ServletContext sc) {
  	    Stopwatch sw = Stopwatch.begin();
          // 获取classes文件夹的路径, 优先级为125
  	    String classesPath = sc.getRealPath("/WEB-INF/classes");
  	    if (classesPath == null)
  	        addResourceLocation(new WebClassesResourceLocation(sc));
  	    else {
  	        ResourceLocation rc = ResourceLocation.file(new File(classesPath));
  	        if (rc instanceof FileSystemResourceLocation)
  	            ((FileSystemResourceLocation)rc).priority = 125;
  	        addResourceLocation(rc);
  	    }
  
          // 获取lib文件夹中的全部jar, 优先级是50
          Set<String> jars = sc.getResourcePaths("/WEB-INF/lib/");
          if (jars != null) {// 这个文件夹不一定存在,尤其是Maven的WebApp项目
              for (String path : jars) {
                  if (!path.endsWith(".jar"))
                      continue;
                  try {
                      addResourceLocation(new JarResourceLocation(sc.getResource(path)));
                  }
                  catch (Exception e) {
                      log.debug("parse jar fail >> " + e.getMessage());
                  }
              }
          }
          sw.stop();
          printLocations(sw);
          return this;
      }
docs: 在Web环境中使用Nutz的任何功能,都应该先调用这个方法,以初始化资源扫描器
  <p/>
  调用一次就可以了