package com.wonders.api.dateimport java.util.UUIDpublic class UUIDTest { public static void main(String[] args) { UUID uuid = UUID.randomUUID() int uuidLen = uuid.toString().length() System.out.println("生成的UUID是 : " + uuid.toString()) System.out.println("生成的UUID的长度是 : " + uuidLen) String str = uuid.toString().replaceAll("-", "") System.out.println("去掉连接符后的uuid是 : " + str) System.out.println("去掉连接符后的uuid长度是 : " + str.length()) //比如我们的主键长度是25,我们可以截取 System.out.println("截取后的UUID是 :" + str.substring(0, 25)) }}