redisTemplate没有setNx,可以自己写
1.
public boolean setNx(String key) {
return (Boolean) redisTemplate.execute((RedisCallback) connection -> {
long expireAt = System.currentTimeMillis() + LOCKTIME + 1;
Boolean acquire = connection.setNX(key.getBytes(), String.valueOf(expireAt).getBytes());
if (acquire) {
//设置成功标识没有锁
return true;
} else {
//已加锁
byte[] value = connection.get(key.getBytes());
if (Objects.nonNull(value) && value.length > 0) {
long expireTime = Long.parseLong(new String(value));
if (expireTime < System.currentTimeMillis()) {
// 加锁时间过期
byte[] oldValue = connection.getSet(key.getBytes(), String.valueOf(System.currentTimeMillis() + LOCKTIME + 1).getBytes());
// 防止死锁
return Long.parseLong(new String(oldValue)) < System.currentTimeMillis();
}
}
}
return false;
});
}
2.
public boolean setNx(String key, String value, long expires, TimeUnit timeUnit) {
boolean flag = false;
try {
flag = (boolean) redisTemplate.execute((RedisCallback<Boolean>) connection -> connection.set(key.getBytes(), value.getBytes(), Expiration.from(expires, timeUnit), RedisStringCommands.SetOption.ifAbsent()));
} catch (Exception e) {
log.error("设置缓存异常, key = {}", key, e);
}
return flag;
}