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redis的模糊检索有两种方式:
1、使用keys
通配符 * ? []
其匹配的字符跟一般的正则一样。
keys a* 可以匹配以a开头的字符串。
keys语法简单,但是数据量大的时候容易出现超时异常。
2、使用scan
这里使用的是spring的一个模板redisTemplate
private Cursor<String> scan(String pattern, int limit) { ScanOptions options =
ScanOptions.scanOptions().match(pattern).count(limit).build();
RedisSerializer<String> redisSerializer = (RedisSerializer<String>)
redisTemplate.getKeySerializer(); return (Cursor)
redisTemplate.executeWithStickyConnection(new RedisCallback() { @Override
public Object doInRedis(RedisConnection redisConnection) throws
DataAccessException { Object obj = new
ConvertingCursor<>(redisConnection.scan(options),
redisSerializer::deserialize); try { redisConnection.close(); } catch
(Exception e) { e.printStackTrace(); } return obj; } }); }
redisConnection.close();这个是关闭连接,要不然链接数量上限之后会一直阻塞。
接收的是一个Cursor
public List<String> getAll4Value(String keyPatten,int limitCount){
intiParam(); List<String> lstTmp = new ArrayList<>(); Cursor<String> cursor =
scan(keyPatten,limitCount); while (cursor.hasNext()) { String key =
cursor.next(); Object obj = get(key); if(!StringUtils.isEmpty(obj)){
lstTmp.add(obj.toString()); } } return lstTmp; }
keyPatten:正则表达式接收*、、[]
limitCount:返回的数量