Java生成独一无二的工单号实例

/**
 * 使用redis生成分布式ID
 */
public interface IdGeneratorService {

	/**
	 * @param biz 业务名称
	 */
	long generatorId(String biz);

	/**
	 *
	 * @return
	 */
	long generatorId();

	/**
	 * 返回工单号 customizerStr-日期-序号
	 * @param customizerStr 自定义参数
	 */
	String  generatorOrderNo(String customizerStr);
}

import com.google.common.base.Strings;

import org.springblade.equipment.service.IdGeneratorService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.util.Calendar;
import java.util.Date;
import java.util.concurrent.TimeUnit;

import lombok.extern.slf4j.Slf4j;

@Service
@Slf4j
public class RedisIdGeneratorService implements IdGeneratorService {

	private static final String keyPrefix = "smart";

	/**
	 * JedisClient对象
	 */
	@Autowired
	private RedisTemplate<String, Object> redisTemplate;


	/**
	 * @Description
	 * @author butterfly
	 */
	private String getIDPrefix() {
		Date date = new Date();
		Calendar c = Calendar.getInstance();
		c.setTime(date);
		int year = c.get(Calendar.YEAR);
		int day = c.get(Calendar.DAY_OF_YEAR); // 今天是第多少天
		int hour = c.get(Calendar.HOUR_OF_DAY);
		int minute = c.get(Calendar.MINUTE);
		int second = c.get(Calendar.SECOND);
		String dayFmt = String.format("%1$03d", day); // 0补位操作 必须满足三位
		String hourFmt = String.format("%1$02d", hour);  // 0补位操作 必须满足2位
		String minuteFmt = String.format("%1$02d", minute);  // 0补位操作 必须满足2位
		String secondFmt = String.format("%1$02d", second);  // 0补位操作 必须满足2位
		StringBuffer prefix = new StringBuffer();
		prefix.append((year - 2000)).append(dayFmt).append(hourFmt).append(minuteFmt).append(secondFmt);
		return prefix.toString();
	}

	/**
	 * 自定义工单前缀
	 */
	private String getOrderNoPrefix(String customizerStr){
		StringBuffer prefix = new StringBuffer();
		LocalDate now = LocalDate.now();
		prefix.append(customizerStr).append("-").append(now.getYear()).append(now.getMonthValue()).append(now.getDayOfMonth());
		return prefix.toString();
	}

	/**
	 * @author butterfly
	 */
	private long incrDistrId(String biz) {
		String prefix = getIDPrefix();
		String orderId = null;
		String key = "#{biz}:id:".replace("#{biz}", biz).concat(prefix); // 00001
		try {
			ValueOperations<String, Object> valueOper = redisTemplate.opsForValue();
			Long index = valueOper.increment(key, 1);
			orderId = prefix.concat(String.format("%1$05d", index)); // 补位操作 保证满足5位
		} catch (Exception ex) {
			log.error("分布式订单号生成失败异常。。。。。", ex);
		} finally {
			redisTemplate.expire(key, 600, TimeUnit.SECONDS);//保留10分钟内的key
		}
		if (Strings.isNullOrEmpty(orderId)) return 0;
		return Long.parseLong(orderId);
	}

	/**
	 * @Description 生成分布式ID
	 * @author butterfly
	 */
	@Override
	public long generatorId(String biz) {
		// 转成数字类型，可排序
		return incrDistrId(biz);
	}

	@Override
	public long generatorId() {
		return incrDistrId(keyPrefix);
	}

	/**
	 * 获得前缀
	 * 去redis查看是否有对应的值
	 * 有的话取回来新增 001-》002
	 * 没有的直接插入，值为001
	 * 设置过期时间24小时
	 * @param customizerStr 自定义参数
	 * @return
	 */
	@Override
	public String generatorOrderNo(String customizerStr) {
		String orderNoPrefix = this.getOrderNoPrefix(customizerStr);
		String key = orderNoPrefix;
		String value ="";
		try{
			ValueOperations<String, Object> valueOper = redisTemplate.opsForValue();
			Object o = valueOper.get(key);
			//没有的直接插入，值为001
			if(o==null){
				valueOper.set(key,1);
				value="001";
			}else{
				//有的话取回来新增 001-》002
				Integer oldValue = Integer.valueOf(o.toString());
				int newValue = oldValue + 1;
				valueOper.set(key,newValue);
				//其中0表示补零而不是补空格，6表示至少6位
				value=String.format("%03d",newValue);
			}
		}catch (Exception e){
			log.error("工单no生成失败,reason:"+e);
		}finally {
			redisTemplate.expire(key,24,TimeUnit.HOURS);
		}
		return key+"-"+value;
	}


}