唯一id工具

//生成的UUID是带-的字符串，类似于：a5c8a5e8-df2b-4706-bea4-08d0939410e3 
String uuid = IdUtil.randomUUID(); 
//生成的是不带-的字符串，类似于：b17f24ff026d40949c85a24f4f375d42 
String simpleUUID = IdUtil.simpleUUID();

19位雪花算法

//参数1为终端ID
//参数2为数据中心ID
Snowflake snowflake = IdUtil.getSnowflake(1, 1);
long id = snowflake.nextId();

//简单使用
long id = IdUtil.getSnowflakeNextId();
String id = snowflake.getSnowflakeNextIdStr();