BigDecimal在某区间进行比较

转自：https://blog.csdn.net/pengsh_clud/article/details/101218128

由于BigDecimal 的精度比较高，在计算的时候有时候存入数据库的时候会进行四舍五入 会对后面的结果判断存在误差 所以比较的结果会在一个区间的

public static boolean compareToInterval(BigDecimal bigDecimal){
    //设置区间在+0.00000001和-0.00000001之间 也是允许的误差  只能比两端的值小
  // 先对传入的bigDecimal 参数进行符号判断 在对区间两端的值进行比较
  // 即和0进行比较  小于即为负数 大于即为负数 等于即为0
  int symbol=bigDecimal.compareTo(new BigDecimal("0"));
  if(symbol>=0){
    int begin=bigDecimal.compareTo(new BigDecimal("0.00000001"));
    if(begin<=0){
      return true;
    }
  }
  else {
    int end=bigDecimal.compareTo(new BigDecimal("-0.00000001"));
    if(end>=0){
      return true;
    }
  }
  return  false;
}

eg：

//3.1、1类金额预算
if(!StringUtils.isEmpty(map.get("budgutType"))) {
    if ("1".equals(map.get("budgutType"))) {
        airVO = airVO.stream().filter(x -> x.getRailBudgetOne() != null).filter(x -> {
            int symbol = x.getRailBudgetAir().compareTo(new BigDecimal("0"));
            if (symbol > 0 && !"".equals(map.get("beginBudget1")) && !"".equals(map.get("endBudget1"))) {
                int begin = x.getRailBudgetAir().compareTo(new BigDecimal(map.get("beginBudgetAir")));
                int end = x.getRailBudgetAir().compareTo(new BigDecimal(map.get("endBudget1")));
                return (begin >= 0 && end <= 0);
            } else {
                return false;
            }
        }).collect(Collectors.toList());
    }
    //3.2、2类金额预算
    else if ("2".equals(map.get("budgutType"))) {
        airVO = airVO.stream().filter(x -> x.getComBudgetAir() != null).filter(x -> {
            int symbol = x.getComBudgetAir().compareTo(new BigDecimal("0"));
            if (symbol > 0 && !"".equals(map.get("beginBudget1")) && !"".equals(map.get("endBudget1"))) {
                int begin = x.getComBudgetAir().compareTo(new BigDecimal(map.get("beginBudget1")));
                int end = x.getComBudgetAir().compareTo(new BigDecimal(map.get("endBudget1")));
                return (begin >= 0 && end <= 0);
            }else {
                return false;
            }
        }).collect(Collectors.toList());
    }
    //3.3、3类金额预算
    else if ("3".equals(map.get("budgutType"))) {
        airVO = airVO.stream().filter(x -> x.getGovBudgetAir() != null).filter(x -> {
            int symbol = x.getGovBudgetAir().compareTo(new BigDecimal("0"));
            if (symbol > 0 && !"".equals(map.get("beginBudget1")) && !"".equals(map.get("endBudget1"))) {
                int begin = x.getGovBudgetAir().compareTo(new BigDecimal(map.get("beginBudget1")));
                int end = x.getGovBudgetAir().compareTo(new BigDecimal(map.get("endBudget1")));
                return (begin >= 0 && end <= 0);
            } else {
                return false;
            }
        }).collect(Collectors.toList());
    }
}
这样就可以取bigdecimal范围内的值了。