先上無法實現效果的代碼，我的目的是序列化時如果數字型字段為null則填0，盡可能保證數據整齊。

@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString
@JSONType(serializeFeatures = {JSONWriter.Feature.WriteNulls,JSONWriter.Feature.WriteMapNullValue,JSONWriter.Feature.WriteNullNumberAsZero,JSONWriter.Feature.PrettyFormat,}
)
public class Student {@JSONField(name = "na") private String name;@JSONField(name = "ch") private Integer chinese;@JSONField(name = "ma") private Integer math;@JSONField(name = "en") private Integer english;
}

我肯定這是版本的BUG

但是結果不行！！！下面的代碼才能達到目的

@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString
public class Student {@JSONField(name = "na") private String name;@JSONField(name = "ch") private Integer chinese;@JSONField(name = "ma") private Integer math;@JSONField(name = "en") private Integer english;
}Student student = new Student("jack",null,null,null);
String jsonString = JSON.toJSONString(student, JSONWriter.Feature.WriteNulls,               JSONWriter.Feature.WriteMapNullValue,JSONWriter.Feature.WriteNullNumberAsZero,JSONWriter.Feature.PrettyFormat);

還有第二種方法，換fastjson版本，升級至v2.0.58，升級后就能用第一段代碼的寫法了