redis怎么存取java实体

在Java中，我们可以使用RedisTemplate来存取Java实体。首先，我们需要配置RedisTemplate，可以通过实现Redis的序列化来实现。可以使用FastJsonRedisSerializer类来实现序列化。接着，我们可以使用redisTemplate.opsForValue().set()方法来将Java实体存入Redis中，其中需要将Java实体转换为JSON字符串。在获取Java实体时，我们可以使用redisTemplate.opsForValue().get()方法获取JSON字符串，然后使用JSON.parseObject()方法将JSON字符串转换为Java实体。具体实现可以参考以下代码：

1. 配置类：

@Configuration
public class RedisConfig {

    @Bean
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(redisConnectionFactory);
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(new FastJsonRedisSerializer<>(Object.class));
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashValueSerializer(new FastJsonRedisSerializer<>(Object.class));
        return redisTemplate;
    }
}

class FastJsonRedisSerializer<T> implements RedisSerializer<T> {

    private static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");

    private Class<T> clazz;

    public FastJsonRedisSerializer(Class<T> clazz) {
        super();
        this.clazz = clazz;
    }

    @Override
    public byte[] serialize(T t) throws SerializationException {
        if (t == null) {
            return new byte[0];
        }
        return JSON.toJSONString(t, SerializerFeature.WriteClassName).getBytes(DEFAULT_CHARSET);
    }

    @Override
    public T deserialize(byte[] bytes) throws SerializationException {
        if (bytes == null || bytes.length <= 0) {
            return null;
        }
        String str = new String(bytes, DEFAULT_CHARSET);
        return JSON.parseObject(str, clazz);
    }
}

2. 实体类：

public class UserVO implements Serializable {

    private static final long serialVersionUID = 1L;

    private Long id;

    private String username;

    private String password;

    // getter and setter
}

3. 存入Java实体：

@Autowired
private RedisTemplate<String, Object> redisTemplate;

public void setUser(UserVO user) {
    redisTemplate.opsForValue().set("user:" + user.getId(), user);
}

4. 获取Java实体：

@Autowired
private RedisTemplate<String, Object> redisTemplate;

public UserVO getUser(Long id) {
    return (UserVO) redisTemplate.opsForValue().get("user:" + id);
}