json字符串中的key是下划线例如：foot_dist，而实际实体类中的属性是footDist，添加 @JSONField(name = "foot_dist")即可

package com.gblfy;import com.alibaba.fastjson.annotation.JSONField;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
public class Segments {@JSONField(name = "line_name")private String lineName;@JSONField(name = "foot_dist")private String footDist;@JSONField(name = "stat_xys")private String statXys;@JSONField(name = "stats")private String stats;@JSONField(name = "end_stat")private String endStat;@JSONField(name = "line_xys")private String lineXys;@JSONField(name = "line_dist")private String lineDist;@JSONField(name = "start_stat")private String startStat;
}

 //序列化时指定json的key值public static void main(String[] args) {Segments build = new Segments().builder().footDist("123").startStat("456").stats("2").build();System.out.println("sss"+JSON.toJSONString(build));}