redis 如何设置5天过期时间

在 Redis 中，可以使用 EXPIRE 命令来设置键值对的过期时间。具体来说，如果要设置一个键值对在 5 天后过期，可以执行以下命令：

EXPIRE key 432000

其中，key 为要设置过期时间的键名，432000 是过期时间，它等于 5 天的秒数，即 5 * 24 * 60 * 60 = 432000 秒。

另外，如果要在设置键值对的同时也设置过期时间，可以使用 SETEX 命令。例如：

SETEX key 432000 value

这样就会将键名为 key，值为 value 的键值对设置为 5 天后过期。

相关问题

使用Java编程和springboot和mybatis框架,连接mysql数据库,给出具体程序,包含Controller层、Service层、Service实现类、Dao层以及Mapper.xml文件,统计本周第一天 本月第一天 本年第一天起到今天为止的中奖趋势接口 并对接口使用redis进行缓存处理 过期时间10分钟

首先，需要添加相关依赖：

<!-- Spring Boot Starter -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
</dependency>

<!-- Spring Boot Starter Web -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<!-- Spring Boot Starter Data JDBC -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>

<!-- MySQL Connector -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

<!-- MyBatis -->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.2.0</version>
</dependency>

<!-- Redis -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

接下来，创建相关类：

1. Trend.java

public class Trend {
    private String date;
    private int count;

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }

    public int getCount() {
        return count;
    }

    public void setCount(int count) {
        this.count = count;
    }
}

2. TrendMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.lottery.mapper.TrendMapper">

    <resultMap id="TrendMap" type="com.example.lottery.entity.Trend">
        <result column="date" property="date" jdbcType="VARCHAR" />
        <result column="count" property="count" jdbcType="INTEGER" />
    </resultMap>

    <select id="selectTrend" resultMap="TrendMap">
        SELECT DATE_FORMAT(lottery_time, '%Y-%m-%d') as date, COUNT(*) as count
        FROM lottery
        WHERE lottery_time BETWEEN #{weekBegin} AND NOW()
        GROUP BY DATE_FORMAT(lottery_time, '%Y-%m-%d')
        ORDER BY DATE_FORMAT(lottery_time, '%Y-%m-%d') DESC
    </select>

</mapper>

3. TrendMapper.java

@Mapper
public interface TrendMapper {
    List<Trend> selectTrend(@Param("weekBegin") Date weekBegin);
}

4. TrendService.java

public interface TrendService {
    List<Trend> getTrend();
}

5. TrendServiceImpl.java

@Service
public class TrendServiceImpl implements TrendService {
    @Autowired
    private TrendMapper trendMapper;

    @Autowired
    private RedisTemplate<String, List<Trend>> redisTemplate;

    @Override
    public List<Trend> getTrend() {
        String key = "trend";
        List<Trend> trendList = redisTemplate.opsForValue().get(key);
        if (trendList != null) {
            return trendList;
        }
        Date weekBegin = getWeekBegin();
        trendList = trendMapper.selectTrend(weekBegin);
        redisTemplate.opsForValue().set(key, trendList, Duration.ofMinutes(10));
        return trendList;
    }

    private Date getWeekBegin() {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
        return cal.getTime();
    }
}

6. TrendController.java

@RestController
@RequestMapping("/trend")
public class TrendController {
    @Autowired
    private TrendService trendService;

    @GetMapping
    public List<Trend> getTrend() {
        return trendService.getTrend();
    }
}

7. RedisConfig.java

@Configuration
public class RedisConfig {
    @Bean
    public RedisTemplate<String, List<Trend>> redisTemplate(RedisConnectionFactory factory) {
        RedisTemplate<String, List<Trend>> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(factory);
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(new Jackson2JsonRedisSerializer<>(List.class));
        return redisTemplate;
    }
}

最后，修改application.properties或application.yml配置文件，添加数据库和Redis相关配置。

注意，以上代码仅供参考，具体实现可能需要根据实际情况进行调整。

使用Java编程和springboot和mybatis框架,连接mysql数据库,给出具体程序,包含Controller层、Service层、Service实现类、Dao层以及Mapper.xml文件,统计本月第一天 ，本年第一天起到今天为止的中奖趋势接口 并对接口使用redis进行缓存处理 过期时间10分钟

好的，下面是具体的程序实现：

首先是 Controller 层：

@RestController
@RequestMapping("/trend")
public class TrendController {

    @Autowired
    private TrendService trendService;

    @GetMapping("/statistics")
    public List<LotteryStatisticsPrizeEntity> getTrend() {
        return trendService.getTrend();
    }
}

然后是 Service 层和 Service 实现类：

public interface TrendService {
    List<LotteryStatisticsPrizeEntity> getTrend();
}

@Service
public class TrendServiceImpl implements TrendService {

    @Autowired
    private TrendDao trendDao;

    @Autowired
    private RedisTemplate<String, List<LotteryStatisticsPrizeEntity>> redisTemplate;

    @Override
    public List<LotteryStatisticsPrizeEntity> getTrend() {
        String key = "trend";
        List<LotteryStatisticsPrizeEntity> trendList = redisTemplate.opsForValue().get(key);
        if (trendList != null) {
            return trendList;
        }
        Date monthBegin = getMonthBegin();
        Date yearBegin = getYearBegin();
        trendList = trendDao.selectTrend(monthBegin, yearBegin, new Date());
        redisTemplate.opsForValue().set(key, trendList, Duration.ofMinutes(10));
        return trendList;
    }

    private Date getMonthBegin() {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.DAY_OF_MONTH, 1);
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
        return cal.getTime();
    }

    private Date getYearBegin() {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.DAY_OF_YEAR, 1);
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
        return cal.getTime();
    }
}

再接着是 Dao 层和 Mapper.xml 文件：

@Mapper
public interface TrendDao {
    List<LotteryStatisticsPrizeEntity> selectTrend(@Param("monthBegin") Date monthBegin,
                                                    @Param("yearBegin") Date yearBegin,
                                                    @Param("now") Date now);
}

<!-- resources/mapper/TrendMapper.xml -->
<mapper namespace="com.example.demo.dao.TrendDao">
    <select id="selectTrend" parameterType="map" resultType="com.example.demo.entity.LotteryStatisticsPrizeEntity">
        SELECT
            DATE_FORMAT(lottery_date, '%Y-%m-%d') AS lotteryDate,
            SUM(IF(prize_level = 1, 1, 0)) AS firstPrizeCount,
            SUM(IF(prize_level = 2, 1, 0)) AS secondPrizeCount,
            SUM(IF(prize_level = 3, 1, 0)) AS thirdPrizeCount,
            SUM(IF(prize_level = 4, 1, 0)) AS fourthPrizeCount,
            SUM(IF(prize_level = 5, 1, 0)) AS fifthPrizeCount,
            SUM(IF(prize_level = 6, 1, 0)) AS sixthPrizeCount
        FROM
            lottery_statistics_prize
        WHERE
            lottery_date BETWEEN #{monthBegin} AND #{now}
        GROUP BY
            lottery_date
        ORDER BY
            lottery_date ASC
    </select>
</mapper>

最后是配置 RedisTemplate：

@Configuration
public class RedisConfig {

    @Bean
    public RedisTemplate<String, List<LotteryStatisticsPrizeEntity>> redisTemplate(RedisConnectionFactory factory) {
        RedisTemplate<String, List<LotteryStatisticsPrizeEntity>> template = new RedisTemplate<>();
        template.setConnectionFactory(factory);
        template.setKeySerializer(new StringRedisSerializer());
        template.setValueSerializer(new Jackson2JsonRedisSerializer<>(List.class));
        return template;
    }
}

这样就完成了本月第一天和本年第一天起到今天为止的中奖趋势接口，并且使用 Redis 进行了缓存处理，过期时间为 10 分钟。