原理
订单号 = 前缀 + 日期 + (一个 1000-9999 之间的四位数字)
后面的四位数字，可以通过 jedis.incrBy() 来实现。
效能：最多可以在 1 秒钟创建 9000 个不重复单号
代码实现
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@Component
public class IdGenerator {
public enum Type {
NORMAL(""),
ORDER("OR"),
RETURN("RT"),
REFUND("RF");
private String prefix;
Type(String prefix) {
this.prefix = prefix;
}
}
private static String GENERATOR = "GENERATOR";
private static String FORMAT = "yyyyMMddHHmmss";
public String generate(Type type) {
String now = DateFormatUtils.format(new Date(), FORMAT);
String key = GENERATOR + ":" + type.name();
int counter = getCounter(key);
return String.format("%s%s%s", type.prefix, now, counter);
}
@Autowired
Jedis jedis;
private int getCounter(String key) {
int num;
String serial = jedis.get(key);
num = 1000;
if (serial != null && Integer.parseInt(serial) < 9999) {
num = jedis.incrBy(key, 1).intValue();
} else {
jedis.set(key, String.valueOf(num));
}
return num;
}
}
|
测试
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| @RunWith(SpringRunner.class)
@ComponentScan(basePackages = {"com.lyloou.order"})
@SpringBootTest
public class FlowApplicationTests {
@Autowired
IdGenerator idGenerator;
@Test
public void testGenerator() {
List<String> ids = Lists.newArrayList();
for (int i = 0; i < 10; i++) {
double delay = Math.random() * 1000;
Thread.sleep((long) delay);
ids.add(idGenerator.generate(IdGenerator.Type.ORDER));
}
System.out.println(Joiner.on(",\n").join(ids));
}
}
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