redis学习（六）rdm乱码（mac版）

1.工具类加入：

 被@PostConstruct修饰的方法会在服务器加载Servle的时候运行，

并且只会被服务器执行一次。PostConstruct在构造函数之后执

    @PostConstruct
    private void init() {
        redisTemplate.setKeySerializer(RedisSerializer.string());
        redisTemplate.setHashKeySerializer(RedisSerializer.string());
        redisTemplate.setValueSerializer(RedisSerializer.json());
    }

测试：

 redisUtils.set("login", "123456", 20000/1000);

加入前：

加入后：

2.RedisUtils工具类：

@Component
@SuppressWarnings({"unchecked","all"})
public class RedisUtils {

    private RedisTemplate redisTemplate;

    @PostConstruct
    private void init() {
        redisTemplate.setKeySerializer(RedisSerializer.string());
        redisTemplate.setHashKeySerializer(RedisSerializer.string());
        redisTemplate.setValueSerializer(RedisSerializer.json());
    }

    public RedisUtils(RedisTemplate redisTemplate) {
        this.redisTemplate = redisTemplate;
    }

    // =============================common============================

    /**
     * 指定缓存失效时间
     * @param key  键
     * @param time 时间(秒)
     */
    public boolean expire(String key, long time) {
        try {
            if (time > 0) {
                redisTemplate.expire(key, time, TimeUnit.SECONDS);
            }
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }

    /**
     * 根据 key 获取过期时间
     * @param key 键 不能为null
     * @return 时间(秒) 返回0代表为永久有效
     */
    public long getExpire(Object key) {
        return redisTemplate.getExpire(key, TimeUnit.SECONDS);
    }

    /**
     * 查找匹配key
     * @param pattern key
     * @return /
     */
    public List scan(String pattern) {
        ScanOptions options = ScanOptions.scanOptions().match(pattern).build();
        RedisConnectionFactory factory = redisTemplate.getConnectionFactory();
        RedisConnection rc = Objects.requireNonNull(factory).getConnection();
        Cursor cursor = rc.scan(options);
        List result = new ArrayList<>();
        while (cursor.hasNext()) {
            result.add(new String(cursor.next()));
        }
        try {
            RedisConnectionUtils.releaseConnection(rc, factory);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 分页查询 key
     * @param patternKey key
     * @param page 页码
     * @param size 每页数目
     * @return /
     */
    public List findKeysForPage(String patternKey, int page, int size) {
        ScanOptions options = ScanOptions.scanOptions().match(patternKey).build();
        RedisConnectionFactory factory = redisTemplate.getConnectionFactory();
        RedisConnection rc = Objects.requireNonNull(factory).getConnection();
        Cursor cursor = rc.scan(options);
        List result = new ArrayList<>(size);
        int tmpIndex = 0;
        int fromIndex = page * size;
        int toIndex = page * size + size;
        while (cursor.hasNext()) {
            if (tmpIndex >= fromIndex && tmpIndex < toIndex) {
                result.add(new String(cursor.next()));
                tmpIndex++;
                continue;
            }
            // 获取到满足条件的数据后,就可以退出了
            if(tmpIndex >=toIndex) {
                break;
            }
            tmpIndex++;
            cursor.next();
        }
        try {
            RedisConnectionUtils.releaseConnection(rc, factory);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 判断key是否存在
     * @param key 键
     * @return true 存在 false不存在
     */
    public boolean hasKey(String key) {
        try {
            return redisTemplate.hasKey(key);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 删除缓存
     * @param key 可以传一个值 或多个
     */
    public void del(String... key) {
        if (key != null && key.length > 0) {
            if (key.length == 1) {
                redisTemplate.delete(key[0]);
            } else {
                redisTemplate.delete(CollectionUtils.arrayToList(key));
            }
        }
    }

    // ============================String=============================

    /**
     * 普通缓存获取
     * @param key 键
     * @return 值
     */
    public Object get(String key) {
        return key == null ? null : redisTemplate.opsForValue().get(key);
    }

    /**
     * 批量获取
     * @param keys
     * @return
     */
    public List