UUID+随机数

import java.util.Random;
import java.util.UUID;

public class UUIDUtils {

   public static String getUUID(){
         return UUID.randomUUID().toString().replace("-", "");
    }

   //随机产生数字字母
   public static String getStringRandom() {
       String val = "";
       Random random = new Random();
       //参数length，表示生成100位随机数
       for(int i = 0; i < 100; i++) {
           String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num";
           //输出字母还是数字
           if( "char".equalsIgnoreCase(charOrNum) ) {
               //输出是大写字母还是小写字母
               int temp = random.nextInt(2) % 2 == 0 ? 65 : 97;
               val += (char)(random.nextInt(26) + temp);
           } else if( "num".equalsIgnoreCase(charOrNum) ) {
               val += String.valueOf(random.nextInt(10));
           }
       }
       System.out.println("随机产生100位数字字母:"+val);
       return val;
   }  

    public static void main(String[] args) {
        System.out.println("格式前的UUID:" + UUID.randomUUID().toString());
        System.out.println("格式化后的UUID:" + getUUID());
        getStringRandom();
    }
}

展示:

链接:Java随机生成定长纯数字或数字字母混合数

　　1. https://www.cnblogs.com/aGboke/p/5488327.html

　　 2. https://blog.csdn.net/cndmss/article/details/51996876