记录：404
场景：在Spring Boot微服务使用RedisTemplate的SetOperations操作Redis Set集合(无序集合)。
版本：JDK 1.8,Spring Boot 2.6.3,redis-6.2.5
1.微服务中Redis配置信息
1.1在application.yml中Redis配置信息
spring:
redis:
host: 192.168.19.203
port: 28001
password: 12345678
timeout: 500001.2加载简要逻辑
Spring Boot微服务在启动时，自动注解机制会读取application.yml的注入到RedisProperties对象。在Spring环境中就能取到Redis相关配置信息了。
类全称：org.springframework.boot.autoconfigure.data.redis.RedisProperties
1.3在pom.xml添加依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>2.配置RedisTemplate
2.1配置RedisTemplate
@Configuration
public class RedisConfig {
@Bean("redisTemplate")
public RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory lettuceConnectionFactory) {
// 1.创建RedisTemplate对象
RedisTemplate<String, Object> redisTemplate = new RedisTemplate<String, Object>();
// 2.加载Redis配置
redisTemplate.setConnectionFactory(lettuceConnectionFactory);
// 3.配置key序列化
RedisSerializer<?> stringRedisSerializer = new StringRedisSerializer();
redisTemplate.setKeySerializer(stringRedisSerializer);
redisTemplate.setHashKeySerializer(stringRedisSerializer);
// 4.配置Value序列化
Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(Object.class);
ObjectMapper objMapper = new ObjectMapper();
objMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
objMapper.activateDefaultTyping(objMapper.getPolymorphicTypeValidator(), ObjectMapper.DefaultTyping.NON_FINAL);
jackson2JsonRedisSerializer.setObjectMapper(objMapper);
redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);
// 5.初始化RedisTemplate
redisTemplate.afterPropertiesSet();
return redisTemplate;
}
@Bean
public SetOperations<String, Object> setOperations(RedisTemplate<String, Object> redisTemplate) {
return redisTemplate.opsForSet();
}
}2.2解析
在配置RedisTemplate后，在Spring环境中，可以@Autowired自动注入方式注入操作Redis对象。比如：RedisTemplate、SetOperations。
3.使用SetOperations操作Redis Set集合(无序集合)
3.1简要说明
使用SetOperations操作Redis Set集合(无序集合)，常用操作：增、查、删、设置超时等。
3.2操作示例
@RestController
@RequestMapping("/hub/example/load")
@Slf4j
public class LoadController {
@Autowired
private RedisTemplate redisTemplate;
@Autowired
private SetOperations setOperations;
/**
* 操作ZSet,使用ZSetOperations,有序排列且无重复数据
* 对应写命令: ZADD
* 对应读命令: SPOP
*/
@GetMapping("/zSetOperations")
public Object loadData06() {
log.info("ZSetOperations操作开始...");
// 1.增
zSetOperations.add("CityInfo:Hangzhou06", "杭州", 20);
zSetOperations.add("CityInfo:Hangzhou06", "苏州", 10);
zSetOperations.add("CityInfo:Hangzhou06", "上海", 30);
zSetOperations.add("CityInfo:Hangzhou06", "北京", 101);
zSetOperations.add("CityInfo:Hangzhou06", "宁波", 999);
// 2.1查(通过下标查值,从0开始取第一个值)
Set set = zSetOperations.range("CityInfo:Hangzhou06", 1, 4);
set.forEach((value) -> {
System.out.println("value=" + value);
});
// 2.2查(通过Score查值)
set = zSetOperations.rangeByScore("CityInfo:Hangzhou06", 29, 60);
set.forEach((value) -> {
System.out.println("value=" + value);
});
// 3.改
zSetOperations.add("CityInfo:Hangzhou06", "杭州", 99);
// 4.1取(取出Score最大的值,取出后队列中值会删除)
ZSetOperations.TypedTuple obj1 = zSetOperations.popMax("CityInfo:Hangzhou06");
System.out.println("取出最大值,value=" + obj1.getValue() + ",Score=" + obj1.getScore());
// 4.2取(取出Score最小的值,取出后队列中值会删除)
ZSetOperations.TypedTuple obj2 = zSetOperations.popMin("CityInfo:Hangzhou06");
System.out.println("取出最小值,value=" + obj2.getValue() + ",Score=" + obj2.getScore());
// 5.1删除指定值
zSetOperations.remove("CityInfo:Hangzhou06", "上海");
// 5.2按照Score分数大小删除
zSetOperations.removeRangeByScore("CityInfo:Hangzhou06", 1, 100);
// 5.3删(删除全部)
redisTemplate.delete("CityInfo:Hangzhou06");
// 6.设置超时
zSetOperations.add("CityInfo:Hangzhou06", "杭州", 21);
zSetOperations.add("CityInfo:Hangzhou06", "苏州", 11);
redisTemplate.boundValueOps("CityInfo:Hangzhou06").expire(5, TimeUnit.MINUTES);
redisTemplate.expire("CityInfo:Hangzhou06", 10, TimeUnit.MINUTES);
// 7.查询ZSet的元素个数
Long size =zSetOperations.size("CityInfo:Hangzhou06");
System.out.println("查询ZSet的元素个数,size="+size);
log.info("ZSetOperations操作结束...");
return "执行成功";
}
}3.3测试验证
使用Postman测试。
请求RUL：http://127.0.0.1:18205/hub-205-redis/hub/example/load/setOperations
4.SetOperations接口
4.1接口
SetOperations是一个接口，默认实现类是DefaultSetOperations。
接口：org.springframework.data.redis.core.SetOperations。
实现类：org.springframework.data.redis.core.DefaultSetOperations。
4.2接口源码
在源码中，查看接口具体方法，可以快速了解该接口具备功能，以便在生产中能根据实际场景对号入座找到合适方法解决实际问题。
public interface SetOperations<K, V> {
@Nullable
Long add(K key, V... values);
@Nullable
Long remove(K key, Object... values);
@Nullable
V pop(K key);
@Nullable
List<V> pop(K key, long count);
@Nullable
Boolean move(K key, V value, K destKey);
@Nullable
Long size(K key);
@Nullable
Boolean isMember(K key, Object o);
@Nullable
Map<Object, Boolean> isMember(K key, Object... objects);
@Nullable
Set<V> intersect(K key, K otherKey);
@Nullable
Set<V> intersect(K key, Collection<K> otherKeys);
@Nullable
Set<V> intersect(Collection<K> keys);
@Nullable
Long intersectAndStore(K key, K otherKey, K destKey);
@Nullable
Long intersectAndStore(K key, Collection<K> otherKeys, K destKey);
@Nullable
Long intersectAndStore(Collection<K> keys, K destKey);
@Nullable
Set<V> union(K key, K otherKey);
@Nullable
Set<V> union(K key, Collection<K> otherKeys);
@Nullable
Set<V> union(Collection<K> keys);
@Nullable
Long unionAndStore(K key, K otherKey, K destKey);
@Nullable
Long unionAndStore(K key, Collection<K> otherKeys, K destKey);
@Nullable
Long unionAndStore(Collection<K> keys, K destKey);
@Nullable
Set<V> difference(K key, K otherKey);
@Nullable
Set<V> difference(K key, Collection<K> otherKeys);
@Nullable
Set<V> difference(Collection<K> keys);
@Nullable
Long differenceAndStore(K key, K otherKey, K destKey);
@Nullable
Long differenceAndStore(K key, Collection<K> otherKeys, K destKey);
@Nullable
Long differenceAndStore(Collection<K> keys, K destKey);
@Nullable
Set<V> members(K key);
V randomMember(K key);
@Nullable
Set<V> distinctRandomMembers(K key, long count);
@Nullable
List<V> randomMembers(K key, long count);
Cursor<V> scan(K key, ScanOptions options);
RedisOperations<K, V> getOperations();
}以上，感谢。
2023年4月12日