分布式全局唯一ID （学习总结---从入门到深化）

<dependency>
    <groupId>cn.hutoolgroupId>
    <artifactId>hutool-allartifactId>
    <version>5.7.13version>
dependency>

//参数1为机器标识
//参数2为数据标识
Snowflake snowflake = IdUtil.getSnowflake(1,1);
long id = snowflake.nextId();
//简单使用
long id = IdUtil.getSnowflakeNextId();
String id = snowflake.getSnowflakeNextIdStr();

package com.example.demo.config;
import cn.hutool.core.lang.Snowflake;
import cn.hutool.core.net.NetUtil;
import cn.hutool.core.util.IdUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import javax.annotation.PostConstruct;
@Slf4j
@Component
public class IdGeneratorSnowflake {
    private long workerId = 0;  //第几号机房
    private long datacenterId = 1;  //第几号机器
    private Snowflake snowflake = IdUtil.getSnowflake(workerId, datacenterId);
    @PostConstruct  //构造后开始执行，加载初始化工作
    public void init(){
        try{
            //获取本机的ip地址编码
            workerId = NetUtil.ipv4ToLong(NetUtil.getLocalhostStr());
            log.info("当前机器的workerId: " + workerId);
       }catch (Exception e){
            e.printStackTrace();
            log.warn("当前机器的workerId获取失败 ----> " + e);
            workerId = NetUtil.getLocalhostStr().hashCode();
       }
   }
    /**
     * 生成id
     * @return
     */
    public synchronized long snowflakeId(){
        return snowflake.nextId();
   }
}

        
            org.springframework.boot
            spring-boot-starter
        
        
            org.projectlombok
            lombok
            true
        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.4.2
        
        
            mysql
            mysql-connector-java
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
            
                
                    org.junit.vintage
                    junit-vintage-engine
                
            
        
    

@SpringBootApplication
@MapperScan("com.itbaizhan.sonwflake.mapper")
public class Application {
    public static void main(String[] args) {
      SpringApplication.run(Application.class,args);
   }
}

@Data
public class User {
    @TableId(type = IdType.ASSIGN_ID)// 雪花算法
    private Long id;
    private String name;
    private Integer age;
    private String email;
}

public interface UserMapper extends
BaseMapper {
}

@Test
    void createUser() {
        User user = new User();
        user.setName("张三");
        user.setAge(18);
        user.setEmail("23472@qq.com");
        userMapper.insert(user);
   }