Java List操作

一、拼接List对象里某个属性的值

    List<WxMpUser> wxMpUserlist =wxMpUserMapper.getWxMpUserList(saleOrder.getOrgId());
            //拼接字符串
            String openIds=wxMpUserlist.stream().map(r -> "'"+r.getOpenId()+"'").collect(Collectors.joining(","));

二、Lamada 过滤List数据

 List<NurseSaleOrderVo> list = saleOrderMapper.getNurseSaleOrderList(nurseSaleOrderQo);
  list= list.stream().filter(l->l.getLongitude()!=null&&l.getLatitude()!=null) .collect(Collectors.toList());