对于唯一主键UUID的学习以及使用类似的还有雪花算法用于分布式系统中雪花算法更强大也更复杂

以你之姓@ 2022-12-18 10:53 31阅读 0赞

唯一主键随机生成通过UUID生成类生成后可以去除中间的短线通过？String的replace方法然后对其进行hash调用String的hashCode方法获取hash码通过三元关系使其为正

package baseoflearn.learn;
    
    import java.util.UUID;
    
    /**
     * @author ：zhaofuh
     * @date ：Created in 2020/10/24 11:39
     * @description：测试唯一主键uuid
     * @modified By：
     * @version: 0.1$
     */
    public class UUIDTest {
        public static void main(String[] args) {
            UUID uuid = UUID.randomUUID();
          String   uuid1 = "34c92261-318a-44c1-bdbd-398692641d40";
          uuid1 = uuid1.replace("-","");
          int n =uuid1.hashCode();
            System.out.println(uuid1);
            System.out.println(n);
            if (n<0){
                n =-n;
                System.out.println(n);
            }else {
                n=n;
                System.out.println(n);
            }
    
            System.out.println(uuid);
    
        int s =  getUUID();
            System.out.println(s);
        }
    //生成处理UUID的方法
        public static int getUUID() {
            String id =null;
            UUID uuid = UUID.randomUUID();
            id = uuid.toString();
            //去掉随机ID的短横线
            id = id.replace("-", "");
    
            //将随机ID换成数字
            int num = id.hashCode();
            //去绝对值
            num = num < 0 ? -num : num;
    
            //id = String.valueOf(num);
            System.out.println(num);
            return num;
        }
        //调用
        int uuid = getUUID();
        String filePath = "/root/axs/img/"+uuid+".jpg";
    }