使用ConcurrentHashMap写入缓存

import java.util.Map;

public class Constant {
    public static Map SOCIAL_INDEX_MAP;

    private Constant() {
    }

}

@Component
@Slf4j
public class InitializationConfig {
    @PostConstruct
    public void init() {
        log.info("init service");
        Constant.SOCIAL_INDEX_MAP = new ConcurrentHashMap<>();
    }
}

在方法上加@PostContruct会在项目启动（或spring容器初始化）的时候执行该方法。从Java EE5规范开始，Servlet中增加了两个影响Servlet生命周期的注解，@PostConstruct和@PreDestroy，这两个注解被用来修饰一个非静态的void（）方法。

public Object getSearchSocial(String id, String type, List source) {
        if (Constant.SOCIAL_INDEX_MAP.containsKey(id)) {
            return Constant.SOCIAL_INDEX_MAP.get(id);
        }
        List list = new ArrayList();
        for (int i = 29; i < 33 ; i++) {
            Map map = new HashMap<>();
            double sum = Double.parseDouble(String.valueOf(socialWithSource(id,type,source,"2021-08-02", "2021-08-08")));
            map.put("searchIndex",Double.parseDouble(df.format(sum/7)));
            map.put("volume",getTenSocial(type,source,"2021-08-02", "2021-08-08"));
            list.add(map);
        }
        if (!CollectionUtils.isEmpty(list)){
            Constant.SOCIAL_INDEX_MAP.put(id,list);
        }
        return list;
    }