package com.dsh.course.util;



import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;

/**
 * 定义生成随机码的工具类
 */
public class UUIDUtil {

    private int i = 1;


    /**
     * 定义生成原生的UUID随机码
     * @return
     */
    public static String getNativeUUID(){
        return UUID.randomUUID().toString();
    }


    /**
     * 生成32位随机码
     * @return
     */
    public static String getRandomCode(){
        return UUIDUtil.getNativeUUID().replaceAll("-", "");
    }


    /**
     * 获取给定长度的随机码
     * @param num
     * @return
     * @throws Exception
     */
    public static String getRandomCode(Integer num) throws Exception{
        String str = null;
        if(0 < num){
            if(num % 32 > 0){
                Integer s = num / 32;
                Integer l = num % 32;
                StringBuffer sb = new StringBuffer();
                for(int i = 0; i < s; i++){
                    sb.append(UUIDUtil.getRandomCode());
                }
                sb.append(UUIDUtil.getRandomCode().substring(0, l));
                str = sb.toString();
            }else if(num % 32 == 0){
                Integer s = num / 32;
                StringBuffer sb = new StringBuffer();
                for(int i = 0; i < s; i++){
                    sb.append(UUIDUtil.getRandomCode());
                }
                str = sb.toString();
            }else{
                str = UUIDUtil.getRandomCode().substring(0, num);
            }
        }else{
            throw new Exception("参数只能大于0");
        }
        return str;
    }


    /**
     * 获取根据当前时间的字符串数据
     * @return
     */
    public synchronized static String getTimeStr(){
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMddhhmmssS");
        return simpleDateFormat.format(new Date());
    }


    /**
     * @Description: 获取数字随机码
     * @Author pzb
     * @Date 2021/8/11 16:52
     * @Param
     * @Return
     * @Exception
     */
    public static String getNumberRandom(Integer num){
        if(null == num){
            num = 32;
        }
        StringBuffer sb = new StringBuffer();
        for(int i = 0; i < num; i++){
            sb.append(Double.valueOf(Math.random() * 10).intValue());
        }
        return sb.toString();
    }



}