返回前端的实体中包含long类型，并且因为精度丢失导致返回数据变化。添加注解把long转换成字符串。
@ApiModelProperty(value = "活动ID ", name = "campaignId", required = true)
@JsonSerialize(using= ToStringSerializer.class)
private Long campaignId;
原文：https://www.cnblogs.com/c1oudy/p/13140162.html