常用公共工具类——Redis工具类

 

@Component
public class RedisUtils {
    @Autowired
    private RedisTemplate<String, Object> redisTemplate;

    @Autowired
    private ValueOperations<String, String> valueOperations;
    @Autowired
    private HashOperations<String, String, Object> hashOperations;
    @Autowired
    private ListOperations<String, Object> listOperations;
    @Autowired
    private SetOperations<String, Object> setOperations;
    @Autowired
    private ZSetOperations<String, Object> zSetOperations;
    /**  默认过期时长，单位：秒 */
    public final static long DEFAULT_EXPIRE = 60 * 60 * 24;
    /**  不设置过期时长 */
    public final static long NOT_EXPIRE = -1;
    private final static Gson gson = new Gson();

    public void set(String key, Object value, long expire){
        //通过ValueOperations设置值
        valueOperations.set(key, toJson(value));
        if(expire != NOT_EXPIRE){
            //设置key的失效时间
            redisTemplate.expire(key, expire, TimeUnit.SECONDS);
        }
    }

    /**
     * set存数据
     * @param key
     * @param value
     */
    public void set(String key, Object value){
        set(key, value, DEFAULT_EXPIRE);
    }



    public <T> T get(String key, Class<T> clazz, long expire) {
        //通过ValueOperations获取值
        String value = valueOperations.get(key);
        if(expire != NOT_EXPIRE){
            //设置key的失效时间
            redisTemplate.expire(key, expire, TimeUnit.SECONDS);
        }
        return value == null ? null : fromJson(value, clazz);
    }
    /**
     * get获取数据
     * @param key
     * @param clazz
     * @param <T>
     * @return
     */
    public <T> T get(String key, Class<T> clazz) {
        return get(key, clazz, NOT_EXPIRE);
    }


    public String get(String key, long expire) {
        String value = valueOperations.get(key);
        if(expire != NOT_EXPIRE){
            redisTemplate.expire(key, expire, TimeUnit.SECONDS);
        }
        return value;
    }

    /**
     * get获取数据
     * @param key
     * @return
     */
    public String get(String key) {
        return get(key, NOT_EXPIRE);
    }

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

    /**
     * Object转成JSON数据
     */
    private String toJson(Object object){
        if(object instanceof Integer || object instanceof Long || object instanceof Float ||
                object instanceof Double || object instanceof Boolean || object instanceof String){
            return String.valueOf(object);
        }
        return gson.toJson(object);
    }

    /**
     * JSON数据，转成Object
     */
    private <T> T fromJson(String json, Class<T> clazz){
        return gson.fromJson(json, clazz);
    }
}