Java 对象转Json，@JSONField对象字段重命名和顺序问题

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Java 对象转Json，@JSONField对象字段重命名和顺序问题

2023-08-17 01:33| 来源: 网络整理| 查看: 265

一、引入maven依赖 com.alibaba fastjson 1.2.66 二、字段重命名

1.创建一个测试实体

import lombok.Data; import java.io.Serializable; /** * @类名 WeChatBusinessLicenseInfo * @描述营业执照/登记证书信息（测试用） * @版本 1.0 * @创建人 XuKang * @创建时间 2021/12/24 10:43 **/ @Data public class LkWeChatBusinessLicenseInfo implements Serializable { private static final long serialVersionUID = 1582941630439552458L; private String businessLicenseCopy; private String businessLicenseNumber; private String merchantName; private String legalPerson; private String companyAddress; private String businessTime; public LkWeChatBusinessLicenseInfo(){ this.businessLicenseCopy = "1"; this.businessLicenseNumber = "2"; this.merchantName = "3"; this.legalPerson = "4"; this.companyAddress = "5"; this.businessTime = "6"; } }

2.将实体转换为json字符串，看看未转换前的效果

System.out.println(JSONObject.toJSONString(new LkWeChatBusinessLicenseInfo()));

{ "businessLicenseCopy":"1", "businessLicenseNumber":"2", "businessTime":"6", "companyAddress":"5", "legalPerson":"4", "merchantName":"3" }

3.我们要转换为带下划线的key，例如把businessLicenseCopy转换为business_license_copy

我们需要修改实体，加上注解@JSONField

import com.alibaba.fastjson.JSONObject; import com.alibaba.fastjson.annotation.JSONField; import lombok.Data; import java.io.Serializable; /** * @类名 WeChatBusinessLicenseInfo * @描述营业执照/登记证书信息（测试用） * @版本 1.0 * @创建人 XuKang * @创建时间 2021/12/24 10:43 **/ @Data public class LkWeChatBusinessLicenseInfo implements Serializable { private static final long serialVersionUID = 1582941630439552458L; @JSONField(name = "business_license_copy") private String businessLicenseCopy; @JSONField(name = "business_license_number") private String businessLicenseNumber; @JSONField(name = "merchant_name") private String merchantName; @JSONField(name = "legal_person") private String legalPerson; @JSONField(name = "company_address") private String companyAddress; @JSONField(name = "business_time") private String businessTime; public LkWeChatBusinessLicenseInfo(){ this.businessLicenseCopy = "1"; this.businessLicenseNumber = "2"; this.merchantName = "3"; this.legalPerson = "4"; this.companyAddress = "5"; this.businessTime = "6"; } }

4.加上注解后打印转换后的json

System.out.println(JSONObject.toJSONString(new LkWeChatBusinessLicenseInfo()));

{ "business_license_copy":"1", "business_license_number":"2", "business_time":"6", "company_address":"5", "legal_person":"4", "merchant_name":"3" }

三、字段排序

1.我们输出打印的json是这样的

{ "business_license_copy":"1", "business_license_number":"2", "business_time":"6", "company_address":"5", "legal_person":"4", "merchant_name":"3" }

我们想按照一定的顺序重新排序key

2.在@JSONField注解加上排序ordinal

import com.alibaba.fastjson.JSONObject; import com.alibaba.fastjson.annotation.JSONField; import lombok.Data; import java.io.Serializable; /** * @类名 WeChatBusinessLicenseInfo * @描述营业执照/登记证书信息（测试用） * @版本 1.0 * @创建人 XuKang * @创建时间 2021/12/24 10:43 **/ @Data public class LkWeChatBusinessLicenseInfo implements Serializable { private static final long serialVersionUID = 1582941630439552458L; @JSONField(name = "business_license_copy",ordinal = 1) private String businessLicenseCopy; @JSONField(name = "business_license_number",ordinal = 2) private String businessLicenseNumber; @JSONField(name = "merchant_name",ordinal = 3) private String merchantName; @JSONField(name = "legal_person",ordinal = 4) private String legalPerson; @JSONField(name = "company_address",ordinal = 5) private String companyAddress; @JSONField(name = "business_time",ordinal = 6) private String businessTime; public LkWeChatBusinessLicenseInfo(){ this.businessLicenseCopy = "1"; this.businessLicenseNumber = "2"; this.merchantName = "3"; this.legalPerson = "4"; this.companyAddress = "5"; this.businessTime = "6"; } }

3.输出打印转换后的实体：

System.out.println(JSONObject.toJSONString(new LkWeChatBusinessLicenseInfo()));

{ "business_license_copy":"1", "business_license_number":"2", "merchant_name":"3", "legal_person":"4", "company_address":"5", "business_time":"6" }

四、总结

重命名除@JSONField，还有@JsonProperty、@SerializedName；

@JsonProperty主要用于入参转换，和Json字符串序列化为Java对象；

@SerializedName 改变了默认序列化和默认反序列化的字段取值；

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Java 对象转Json，@JSONField对象字段重命名和顺序问题

Java 对象转Json，@JSONField对象字段重命名和顺序问题

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