一、引入maven依賴

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.66</version>
        </dependency>

二、字段重命名

1.創(chuàng)建一個測試實體

import lombok.Data;

import java.io.Serializable;

/**
 * @類名 WeChatBusinessLicenseInfo
 * @描述 營業(yè)執(zhí)照/登記證書信息（測試用）
 * @版本 1.0
 * @創(chuàng)建人 XuKang
 * @創(chuàng)建時間 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.將實體轉(zhuǎn)換為json字符串，看看未轉(zhuǎn)換前的效果

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

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

3.我們要轉(zhuǎn)換為帶下劃線的key，例如把businessLicenseCopy轉(zhuǎn)換為business_license_copy

我們需要修改實體，加上注解@JSONField

import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.annotation.JSONField;
import lombok.Data;

import java.io.Serializable;

/**
 * @類名 WeChatBusinessLicenseInfo
 * @描述 營業(yè)執(zhí)照/登記證書信息（測試用）
 * @版本 1.0
 * @創(chuàng)建人 XuKang
 * @創(chuàng)建時間 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.加上注解后打印轉(zhuǎn)換后的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.我們輸出打印的json是這樣的

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

我們想按照一定的順序重新排序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;

/**
 * @類名 WeChatBusinessLicenseInfo
 * @描述 營業(yè)執(zhí)照/登記證書信息（測試用）
 * @版本 1.0
 * @創(chuàng)建人 XuKang
 * @創(chuàng)建時間 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.輸出打印轉(zhuǎn)換后的實體：

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、總結(jié)

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

@JsonProperty主要用于入?yún)⑥D(zhuǎn)換，和Json字符串序列化為Java對象；

@SerializedName 改變了默認(rèn)序列化和默認(rèn)反序列化的字段取值；文章來源地址http://www.zghlxwxcb.cn/news/detail-402204.html

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