code: public static String getZooBaseUrl(String urlPrefix, String app, String env, String version) {
  
          StringBuffer sb = new StringBuffer();
          sb.append(urlPrefix);
  
          sb.append(Constants.SEP_STRING);
          sb.append(app);
  
          sb.append("_");
          sb.append(version);
  
          sb.append("_");
          sb.append(env);
  
          return sb.toString();
      }
docs: @return String
  
  @Description: 获取ZOOKEEPER的应用基础路径
  @author liaoqiqi
  @date 2013-6-17