code: public String getPropertyIn(Collection<?> collection, String property) throws Exception {
      StringBuilder sb = new StringBuilder();
      if (null != collection) {
        for (Iterator<?> iter = collection.iterator(); iter.hasNext();) {
          Object one = iter.next();
          sb.append(extract(one, property)).append(",");
        }
      }
      // 删除逗号
      if (sb.length() > 0) {
        sb.deleteCharAt(sb.length() - 1);
      }
      return sb.toString();
    }
docs: <p>
  getPropertyIn.
  </p>
  
  @param collection a {@link java.util.Collection} object.
  @param property a {@link java.lang.String} object.
  @return a {@link java.lang.String} object.
  @throws java.lang.Exception if any.