字符串

1. 拼装特定单据号，年月日
   LocalDateTime lat = LocalDateTime.now();
   int year = lat.getYear();
   int monthValue = lat.getMonthValue();
   int dayOfMonth = lat.getDayOfMonth();
   bill.setOrderId("ABC" + year + Strings.padStart(String.valueOf(monthValue), 2, '0') + Strings.padStart(String.valueOf(dayOfMonth), 2, '0') + Strings.padStart(index, 5, '0'));

2. 空白校验
   StringUtils.isBlank(ds.getId()) ? 0L : Long.parseLong(ds.getId())

3. url拼接
   DTO.setUrl(this.getUrlPrefix().concat(m.getPicUrl()));

4. 字符串拼接
   Joiner.on("_").join("ab", id, name)

5. 删除特定字符
   String tempOrgName = cityName.replace("市", "").trim();