redis 存放 redis 不同list集合 不同对象取值 list集合

测试代码

            List<User> userList= new ArrayList<>();userList= ArrayListConstants.getUserSql;//查询 list 集合数据RedisTemplateUtil.setRedisList("keyredis", userList);//set 集合数据RedisTemplateUtil.getRedisList("keyredis", User.class);//取集合数据

GenericTypeReference.java

import com.fasterxml.jackson.core.type.TypeReference;
import sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl;import java.lang.reflect.Type;
import java.util.List;/*** @Author * @Data 2024-04-12 10:37:03*/
public class GenericTypeReference<T> extends TypeReference<List<T>> {private final Class<T> elementType;public GenericTypeReference(Class<T> elementType) {this.elementType = elementType;}@Overridepublic Type getType() {return ParameterizedTypeImpl.make(List.class, new Type[]{elementType}, null);}
}

RedisTemplateUtil 方法

public class RedisTemplateUtil {private static final ObjectMapper objectMapper = new ObjectMapper();private static RedisTemplate redisTemplates;public static <T> void setRedisList(String key, List<T> list) {try {String value = objectMapper.writeValueAsString(list);redisTemplates.opsForValue().set(key, value);} catch (JsonProcessingException e) {logger.error("redis赋值list集合方法：setRedisList 报错" + e.getMessage());}}public static <T> List<T> getRedisList(String key, Class<T> elementType) {try {String json = (String) redisTemplates.opsForValue().get(key);return objectMapper.readValue(json, new GenericTypeReference<>(elementType));} catch (JsonProcessingException e) {logger.error("redis取list集合方法：getRedisList 报错" + e.getMessage());return null;}}public static void setRedisMapList(String key, List<Map<String, Object>> mapList) {try {String value = objectMapper.writeValueAsString(mapList);redisTemplates.opsForValue().set(key, value);} catch (JsonProcessingException e) {logger.error("redis赋值list集合方法：setRedisMapList 报错" + e.getMessage());}}public static List<Map<String, Object>> getRedisMapList(String key) {try {String json = (String) redisTemplates.opsForValue().get(key);return objectMapper.readValue(json, new TypeReference<List<Map<String, Object>>>() {});} catch (JsonProcessingException e) {logger.error("redis取list集合方法：getRedisMapList 报错" + e.getMessage());return null;}}
}