前言
请看下面代码:
String key = String.format("test_key:%s", System.currentTimeMillis()/1000); String key2=key+"_2"; String key3=key+"_3"; List<String> t1=new ArrayList<>(); t1.add("2"); t1.add("3"); t1.add("4"); t1.add("5"); t1.add("1"); redisTemplate.opsForList().leftPushAll(key, t1); redisTemplate.opsForList().leftPushAll(key3, t1.toArray()); redisTemplate.opsForList().leftPushAll(key2,new String[]{"dfdg","dgdaasdf","gdadfdf"});
其中,那么,请猜测一下各个key里面的内容,
下面开奖了:
结论
leftPushAll可以传 Object… 数组,也可以传 Collection进去。
然后实际上,我这边传 ArrayList这些数组是不行的,必须转换为 [] 这种数组―就是说,api里面的leftPushAll(Collection list)
用不了,具体原因还在查。。。
不过网上资料太少了。。
补充:java 用redisTemplate 的 Operations存取list集合
一 、存取为list类型
@RestController @RequestMapping("/test") @Slf4j public class TestController { @Autowired private RedisTemplate redisTemplate; @ApiOperation("redis-savelist") @PostMapping("/redis/save/list") public void redisSaveList() { List<Person> list = getPersonList(); //清空 while (redisTemplate.opsForList().size("oowwoo") > 0){ redisTemplate.opsForList().leftPop("oowwoo"); } //存储 redisTemplate.opsForList().rightPushAll("oowwoo", list); //取出 List<Person> oowwoo = redisTemplate.opsForList().range("oowwoo", 0, -1); log.info(">>>>>>>>>>>>>>>list = {}", oowwoo.toString()); Iterator<Person> it = oowwoo.iterator(); while(it.hasNext()){ Person p = it.next(); log.info("person = {}", p.toString()); } } private List<Person> getPersonList() { Person p1 = new Person(); p1.setId(1L); p1.setName("张一"); p1.setAge(11); Person p2 = new Person(); p2.setId(2L); p2.setName("张二"); p2.setAge(22); Person p3 = new Person(); p3.setId(3L); p3.setName("张三"); p3.setAge(33); List<Person> list = new ArrayList<>(); list.add(p1); list.add(p2); list.add(p3); return list; } }
二 、将list转为json对象存取
import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.JSONObject; @Autowired private StringRedisTemplate stringRedisTemplate; //存 List<Long> businessIdList = eeFreecarriageShopService.selectBusinessIdInPromotion(); stringRedisTemplate.opsForValue().set(RedisConstants.FREECARRIAGE_BUSINESSIDLIST, JSON.toJSON(businessIdList).toString()); //取 String businessJsonArray = stringRedisTemplate.opsForValue().get(RedisConstants.FREECARRIAGE_BUSINESSIDLIST); List<Long> businessIdList = JSONObject.parseArray(businessJsonArray, Long.class);
以上为个人经验,希望能给大家一个参考,也希望大家多多支持服务器之家。如有错误或未考虑完全的地方,望不吝赐教。
原文链接:https://blog.csdn.net/cdnight/article/details/88803869