springboot整合redis

引入依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
            <version>2.5.4</version>
        </dependency>

配置文件

spring:
  redis:
    host: 127.0.0.1
    port: 6379
    database: 0
    password:
    timeout: 10s
    lettuce:
      pool:
        min-idle: 0
        max-idle: 8
        max-active: 8
        max-wait: -1ms

redis 的使用工具类

@Slf4j
@Component
public class RedisCache {
    @Autowired
    private StringRedisTemplate redisTemplate;

    private final String DEFAULT_KEY_PREFIX = "";
    private final int EXPIRE_TIME = 1;
    private final TimeUnit EXPIRE_TIME_TYPE = TimeUnit.DAYS;


    /**
     * 数据缓存至redis
     *
     * @param key
     * @param value
     * @return
     */
    public <K, V> void add(K key, V value) {
        try {
            if (value != null) {
                redisTemplate
                        .opsForValue()
                        .set(DEFAULT_KEY_PREFIX + key, JSON.toJSONString(value));
            }
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            throw new RuntimeException("数据缓存至redis失败");
        }
    }

    /**
     * 数据缓存至redis并设置过期时间
     *
     * @param key
     * @param value
     * @return
     */
    public <K, V> void add(K key, V value, long timeout, TimeUnit unit) {
        try {
            if (value != null) {
                redisTemplate
                        .opsForValue()
                        .set(DEFAULT_KEY_PREFIX + key, JSON.toJSONString(value), timeout, unit);
            }
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            throw new RuntimeException("数据缓存至redis失败");
        }
    }

    /**
     * 写入 hash-set,已经是key-value的键值，不能再写入为hash-set
     *
     * @param key    must not be {@literal null}.
     * @param subKey must not be {@literal null}.
     * @param value  写入的值
     */
    public <K, SK, V> void addHashCache(K key, SK subKey, V value) {
        redisTemplate.opsForHash().put(DEFAULT_KEY_PREFIX + key, subKey, value);
    }

    /**
     * 写入 hash-set,并设置过期时间
     *
     * @param key    must not be {@literal null}.
     * @param subKey must not be {@literal null}.
     * @param value  写入的值
     */
    public <K, SK, V> void addHashCache(K key, SK subKey, V value, long timeout, TimeUnit unit) {
        redisTemplate.opsForHash().put(DEFAULT_KEY_PREFIX + key, subKey, value);
        redisTemplate.expire(DEFAULT_KEY_PREFIX + key, timeout, unit);
    }

    /**
     * 获取 hash-setvalue
     *
     * @param key    must not be {@literal null}.
     * @param subKey must not be {@literal null}.
     */
    public <K, SK> Object getHashCache(K key, SK subKey) {
        return  redisTemplate.opsForHash().get(DEFAULT_KEY_PREFIX + key, subKey);
    }


    /**
     * 从redis中获取缓存数据，转成对象
     *
     * @param key   must not be {@literal null}.
     * @param clazz 对象类型
     * @return
     */
    public <K, V> V getObject(K key, Class<V> clazz) {
        String value = this.get(key);
        V result = null;
        if (!StringUtils.isEmpty(value)) {
            result = JSONObject.parseObject(value, clazz);
        }
        return result;
    }

    /**
     * 从redis中获取缓存数据，转成list
     *
     * @param key   must not be {@literal null}.
     * @param clazz 对象类型
     * @return
     */
    public <K, V> List<V> getList(K key, Class<V> clazz) {
        String value = this.get(key);
        List<V> result = Collections.emptyList();
        if (!StringUtils.isEmpty(value)) {
            result = JSONArray.parseArray(value, clazz);
        }
        return result;
    }

    /**
     * 功能描述：Get the value of {@code key}.
     *
     * @param key must not be {@literal null}.
     * @return java.lang.String
     * @date 2021/9/19
     **/
    public <K> String get(K key) {
        String value;
        try {
            value = redisTemplate.opsForValue().get(DEFAULT_KEY_PREFIX + key);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            throw new RuntimeException("从redis缓存中获取缓存数据失败");
        }
        return value;
    }

    /**
     * 删除key
     */
    public void delete(String key) {
        redisTemplate.delete(key);
    }

    /**
     * 批量删除key
     */
    public void delete(Collection<String> keys) {
        redisTemplate.delete(keys);
    }

    /**
     * 序列化key
     */
    public byte[] dump(String key) {
        return redisTemplate.dump(key);
    }

    /**
     * 是否存在key
     */
    public Boolean hasKey(String key) {
        return redisTemplate.hasKey(key);
    }

    /**
     * 设置过期时间
     */
    public Boolean expire(String key, long timeout, TimeUnit unit) {
        return redisTemplate.expire(key, timeout, unit);
    }

    /**
     * 设置过期时间
     */
    public Boolean expireAt(String key, Date date) {
        return redisTemplate.expireAt(key, date);
    }


    /**
     * 移除 key 的过期时间，key 将持久保持
     */
    public Boolean persist(String key) {
        return redisTemplate.persist(key);
    }

    /**
     * 返回 key 的剩余的过期时间
     */
    public Long getExpire(String key, TimeUnit unit) {
        return redisTemplate.getExpire(key, unit);
    }

    /**
     * 返回 key 的剩余的过期时间
     */
    public Long getExpire(String key) {
        return redisTemplate.getExpire(key);
    }
}