1. 创建Spring Boot项目
首先,创建一个新的Spring Boot项目。你可以使用Spring Initializr(https://start.spring.io/)来生成项目结构。选择以下依赖:
- Spring Web
- Spring Data Redis
- Lombok(可选,用于简化代码)
2. 配置application.yml
在你的 application.yml
文件中添加Redis配置:
spring:
cache:
type: GENERIC
redis:
host: ${sy.redis.ip}
password:
port: ${sy.redis.port}
database: ${sy.redis.database}
3. 创建缓存配置类
创建一个配置类来手动配置基于Redis的缓存管理器:
import org.springframework.cache.CacheManager;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheConfiguration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.serializer.GenericJackson2jsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializationContext;
import Java.time.Duration;
@Configuration
public class CacheConfig {
@Bean
public CacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {
RedisCacheConfiguration cacheConfiguration = RedisCacheConfiguration.defaultCacheConfig()
.entryTtl(Duration.ofMinutes(10)) // 设置缓存过期时间
.disableCachingNullValues()
.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(new GenericJackson2JsonRedisSerializer()));
return RedisCacheManager.builder(redisConnectionFactory)
.cacheDefaults(cacheConfiguration)
.build();
}
}
4. 创建服务类
创建一个服务类来使用Redis的 INCR
方法生成每天的序号
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
@Service
public class SequenceService {
@Autowired
private StringRedisTemplate redisTemplate;
public long getDailySequence() {
String dateStr = DateUtils.format(new Date(), "yyyy-MM-dd");
String key = "dailySequence_" + dateStr;
// 执行 increment 操作
Long applicantNumber = redisTemplate.opsForValue().increment(key);
// 设置过期时间为2天,不设置默认永久
redisTemplate.expire(key, 2, TimeUnit.DAYS);
//redisTemplate.expire(key) // 查询key的过期时间。
//-1: 表示键存在但没有设置过期时间。
//-2: 表示键不存在。
//返回秒:如上面返回值是 172780,这意味着该键将在大约 172780 秒(约 48 小时)后过期。
return applicantNumber;
}
}
5. 创建控制器
创建一个控制器来暴露获取每天序号的API:
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class SequenceController {
@Autowired
private SequenceService sequenceService;
@GetMapping("/daily-sequence")
public String getDailySequence() {
long sequence = sequenceService.getDailySequence();
return "Daily sequence: " + sequence;
}
}
6. 启动类
确保你的启动类包含 @EnableCaching
注解以启用缓存功能:
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.EnableCaching;
@SpringBootApplication
@EnableCaching
public class RedisIncrApplication {
public static void main(String[] args) {
SpringApplication.run(RedisIncrApplication.class, args);
}
}
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