java自定义工具方法-持续更新

private-logs / 2023-08-02 / 原文

1、根据身份证获取出生日期，LocalDateTime

 /**
     * 根据身份证获取出生日期
     * @param idCard
     * @return
     * @throws ParseException
     */
    public static LocalDateTime GetBirthByIdCard(String idCard) {
        Date birth = null;
        try {
            if (idCard.length() == 18) {
                String year = idCard.substring(6).substring(0, 4);// 得到年份
                String month = idCard.substring(10).substring(0, 2);// 得到月份
                String day = idCard.substring(12).substring(0, 2);// 得到日
                SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
                birth = format.parse(year + "-" + month + "-" + day);
            } else if (idCard.length() == 15) {
                String year = "19" + idCard.substring(6, 8);// 年份
                String month = idCard.substring(8, 10);// 月份
                String day = idCard.substring(10, 12);// 得到日
                SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
                birth = format.parse(year + "-" + month + "-" + day);
            }
            if(birth!=null){
                return LocalDateTime.ofInstant(birth.toInstant() , ZoneId.systemDefault());
            }
        } catch (ParseException e) {
        }
        return null;
    }

2、输入流转为数组

/**
 * 输入流转换成byte[]字节数组
 * @param input
 * @return
 */
public static byte[] toByteArray(InputStream input){
    ByteArrayOutputStream output = null;
    BufferedInputStream bis = null;
    try {
        bis = new BufferedInputStream(input);
        output = new ByteArrayOutputStream();
        int result = bis.read();
        while(result != -1) {
            output.write((byte) result);
            result = bis.read();
        }
        return output.toByteArray();
    } catch (IOException e) {
        e.printStackTrace();
    }finally {
        try {
            if(bis != null){
                bis.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            if(output != null){
                output.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return null;
}

3、生成订单编号

 /*
    生成订单编号
     */
    public static String Get16UUID(String typeStr)
    {
        String machined="";
        SimpleDateFormat sdf =new SimpleDateFormat("YYMMdd");
        String dayTime=sdf.format(new Date());
        int hashcode= UUID.randomUUID().toString().hashCode();
        if(hashcode<0)
        {
            hashcode=-hashcode;
        }
        String value=typeStr+machined+dayTime+String.format("%010d",hashcode);
        return  value;

    }

4、生成19位long型唯一数字id

    /**
     * 生成19位long型唯一数字id
     * @return
     */
    public static long GetLong19UUID() {
        //  String nanoRandom = System.nanoTime() + "" + random.nextInt(99999);
        SimpleDateFormat sdf =new SimpleDateFormat("YYMMdd");
        String dayTime=sdf.format(new Date());
        int hashcode= UUID.randomUUID().toString().hashCode();
        if(hashcode<0){
            hashcode=-hashcode;
        }
        int i = (int)(Math.random()*900 + 100);
        String value = dayTime+String.format("%010d",hashcode)+ i;
        long l = Long.parseLong(value);
        return l;
    }