@Test
public void test2(){
String key = "mls_AnswerIdsByQuersionId:"+123;
redisTemplate.opsForZSet().add(key,234L,5); //新增單條
redisTemplate.opsForZSet().add(key,4565L,13);
redisTemplate.opsForZSet().add(key,2345L,15);
Set<ZSetOperations.TypedTuple<Long>> var2 = new HashSet<>();
ZSetOperations
 
.TypedTuple<Long> answerVoInZset1 = new AnswerVoInZset(2345L, 12);
ZSetOperations.TypedTuple<Long> answerVoInZset2 = new AnswerVoInZset(5675L, 16);
ZSetOperations.TypedTuple<Long> answerVoInZset4 = new AnswerVoInZset(4565L, 11);
var2.add(answerVoInZset1);
var2.add(answerVoInZset2);
 
var2.add(answerVoInZset4);
redisTempalte.opsForZSet().add(key, var2);//批量新增
redisTemplate.opsForZSet().remove(key,4565L); //移除單個元素
Set<Long> longs = redisTempalte.opsForZSet().reverseRange(key, 0, 3);
}
//用於批量新增的物件;
class AnswerVoInZset implements ZSetOperations.TypedTuple<Long>{
Long id;
double 
 
score;
public AnswerVoInZset(Long id, double score) {
this.id = id;
this.score = score;
}
@Override
public Long getValue() {
return id;
}
@Override
public Double getScore() {
return score;
}
@Override
public int compareTo(ZSetOperations.TypedTuple<Long> o) {
AnswerVoInZset o1 = (AnswerVoInZset) o;
return new Double(this.score).compareTo(o1.getScore());
}
   }
//時間排序;(參考別人的)
@Resource(name = "redisTemplate")
private RedisTemplate<String, Long> redisTempalte;
public void addRecentBrowsingPosition(long userId, long positionId) {
String key = "mls_AnswerIdsByQuersionId:" + 123;
// 獲取已快取的最近瀏覽的職位
ZSetOperations<String, Long> zSetOperations = redisTempalte.opsForZSet();
// zset內部是按分數來排序的，這裡用當前時間做分數
zSetOperations.add(key, positionId, System.currentTimeMillis());
// 環形結構--4,-3,-2,-1,0,1,2,3,4
zSetOperations.removeRange(key, 0, -6);
}
public List<Long> getRecentBrowsingPositionIds(long userId) {
if (userId <= 0) {
return Collections.emptyList();
}
// 獲取使用者最近瀏覽的職位id
String key = "mls_AnswerIdsByQuersionId:" + 123;
Set<Long> positionIds = redisTempalte.opsForZSet().reverseRange(key, 0, 4);
return new ArrayList<>(positionIds);
}