• 判断字符串是否为null,""," "

    StringUtils.isNotBlank()    StringUtils.isNotBlank(null) = false    StringUtils.isNotBlank("") = false    StringUtils.isNotBlank(" ") = false    StringUtils.isNotBlank("\t \n \f \r") = false
  • 将字符串分隔成集合

     String dd = "1,2,3"; List<String> result = Arrays.asList(dd.split(",")) 结果:{1},{2},{3}
  • 将集合(泛型为String)用逗号拼接成字符串

    String dd = "1,2,3";List<String> result = Arrays.asList(dd.split(","))String pin = String.join(",", result);结果:1,2,3
  • "yyyyMMddHHmmsssss"格式日期

    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd HH:mm:ss");// 得到一个"yyyyMMddHHmmsssss"格式日期(也就是时间戳)String time = simpleDateFormat.format(new Date());// 将当前日期进行格式化操作