package com.dsh.course.util;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.UUID;
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/**
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* 定义生成随机码的工具类
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*/
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public class UUIDUtil {
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private int i = 1;
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/**
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* 定义生成原生的UUID随机码
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*
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* @return
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*/
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public static String getNativeUUID() {
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return UUID.randomUUID().toString();
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}
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/**
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* 生成32位随机码
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*
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* @return
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*/
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public static String getRandomCode() {
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return UUIDUtil.getNativeUUID().replaceAll("-", "");
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}
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/**
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* 获取给定长度的随机码
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*
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* @param num
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* @return
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* @throws Exception
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*/
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public static String getRandomCode(Integer num) throws Exception {
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String str = null;
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if (0 < num) {
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if (num % 32 > 0) {
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Integer s = num / 32;
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Integer l = num % 32;
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StringBuffer sb = new StringBuffer();
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for (int i = 0; i < s; i++) {
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sb.append(UUIDUtil.getRandomCode());
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}
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sb.append(UUIDUtil.getRandomCode().substring(0, l));
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str = sb.toString();
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} else if (num % 32 == 0) {
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Integer s = num / 32;
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StringBuffer sb = new StringBuffer();
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for (int i = 0; i < s; i++) {
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sb.append(UUIDUtil.getRandomCode());
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}
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str = sb.toString();
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} else {
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str = UUIDUtil.getRandomCode().substring(0, num);
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}
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} else {
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throw new Exception("参数只能大于0");
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}
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return str;
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}
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/**
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* 获取根据当前时间的字符串数据
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*
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* @return
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*/
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public synchronized static String getTimeStr() {
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SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMddhhmmssS");
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return simpleDateFormat.format(new Date());
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}
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/**
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* @Description: 获取数字随机码
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* @Author pzb
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* @Date 2021/8/11 16:52
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* @Param
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* @Return
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* @Exception
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*/
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public static String getNumberRandom(Integer num) {
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if (null == num) {
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num = 32;
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}
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StringBuffer sb = new StringBuffer();
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for (int i = 0; i < num; i++) {
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sb.append(Double.valueOf(Math.random() * 10).intValue());
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}
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return sb.toString();
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}
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}
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