我一直在使用 Gson 开发 Paypal JSON 到 Java 对象转换器。但是，它不会生成完整的 Java 对象。似乎这种转换已经完成，但我找不到任何东西。
我的技术是获取 Paypal JSON，替换它们的非 Java 元素名称，然后将其解析为我定义的 Java 对象。
这是 Gson 的样子:
Gson gson = new GsonBuilder().serializeNulls().create();
JSONObjFromPaypalTrx jsonPaypalTrx = gson.fromJson(paypalTrx, JSONObjFromPaypalTrx.class);
logger.debug("jsonPaypalTrx: " +jsonPaypalTrx);
paypalTrx为元素名替换后的Paypal JSON:
paypalTrx: {"id":"PAYID-LXJIHMI92J52777N04488909","intent":"Sale","state":"approved","cart":"25M35194DL227451S","createTime":"2019-11-18T11:42:41Z","Payer":{"paymentMethod":"paypal","status":"VERIFIED","PayerInfo":{"email":"sb-cject591397@personal.example.com","firstName":"John","middleName":"John","lastName":"Doe","payerId":"5V25373K45VBE","countryCode":"US","ShippingAddress":{"recipientName":"John Doe","line1":"1 Main St","city":"San Jose","state":"CA","postalCode":"95131","countryCode":"US"}}},"Transactions":[{"Amount":{"total":"199.99","currency":"USD","Details":{"subtotal":"199.99","shipping":"0.00","handlingFee":"0.00","insurance":"0.00","shippingDiscount":"0.00"}},"ItemList":{},"RelatedResources":[{"Sale":{"id":"80E26736585579458","state":"completed","paymentMode":"INSTANT_TRANSFER","protectionEligibility":"ELIGIBLE","parentPayment":"PAYID-LXJIHMI92J52777N04488909","createTime":"2019-11-18T11:43:00Z","updateTime":"2019-11-18T11:43:00Z","Amount":{"total":"199.99","currency":"USD","Details":{"subtotal":"199.99","shipping":"0.00","handlingFee":"0.00","insurance":"0.00","shippingDiscount":"0.00"}}}}]}]}
这是我定义的 Java 对象:
package com.example;
import java.util.List;
/**
* This JSON Object was derived from a Paypal transaction string.
*/
public class JSONObjFromPaypalTrx{
private String id;
private String intent;
private String state;
private String cart;
private String createTime;
private Payer payer;
private List<Transactions> transactions;
public JSONObjFromPaypalTrx() {
}
public String getId(){
return id;
}
public void setId(String input){
this.id = input;
}
public String getIntent(){
return intent;
}
public void setIntent(String input){
this.intent = input;
}
public String getState(){
return state;
}
public void setState(String input){
this.state = input;
}
public String getCart(){
return cart;
}
public void setCart(String input){
this.cart = input;
}
public String getCreateTime(){
return createTime;
}
public void setCreateTime(String input){
this.createTime = input;
}
public Payer getPayer(){
return payer;
}
public void setPayer(Payer input){
this.payer = input;
}
public List<Transactions> getTransactions(){
return transactions;
}
public void setTransactions(List<Transactions> input){
this.transactions = input;
}
public static class ShippingAddress{
private String recipientName;
private String line1;
private String city;
private String state;
private String postalCode;
private String countryCode;
public ShippingAddress() {
}
public String getRecipientName(){
return recipientName;
}
public void setRecipientName(String input){
this.recipientName = input;
}
public String getLine1(){
return line1;
}
public void setLine1(String input){
this.line1 = input;
}
public String getCity(){
return city;
}
public void setCity(String input){
this.city = input;
}
public String getState(){
return state;
}
public void setState(String input){
this.state = input;
}
public String getPostalCode(){
return postalCode;
}
public void setPostalCode(String input){
this.postalCode = input;
}
public String getCountryCode(){
return countryCode;
}
public void setCountryCode(String input){
this.countryCode = input;
}
@Override
public String toString() {
return "ShippingAddress [recipientName: " + recipientName + ", line1: " + line1 + ", city: " + city
+ ", state: " + state + ", postalCode: " + postalCode + ", countryCode: " + countryCode + "]";
}
}
public static class PayerInfo{
private String email;
private String firstName;
private String middleName;
private String lastName;
private String payerId;
private String countryCode;
private ShippingAddress shippingAddress;
public PayerInfo() {
}
public String getEmail(){
return email;
}
public void setEmail(String input){
this.email = input;
}
public String getFirstName(){
return firstName;
}
public void setFirstName(String input){
this.firstName = input;
}
public String getMiddleName(){
return middleName;
}
public void setMiddleName(String input){
this.middleName = input;
}
public String getLastName(){
return lastName;
}
public void setLastName(String input){
this.lastName = input;
}
public String getPayerId(){
return payerId;
}
public void setPayerId(String input){
this.payerId = input;
}
public String getCountryCode(){
return countryCode;
}
public void setCountryCode(String input){
this.countryCode = input;
}
public ShippingAddress getShippingAddress(){
return shippingAddress;
}
public void setShippingAddress(ShippingAddress input){
this.shippingAddress = input;
}
@Override
public String toString() {
return "PayerInfo [email: " + email + ", firstName: " + firstName + ", middleName: " + middleName
+ ", lastName: " + lastName + ", payerId: " + payerId + ", countryCode: " + countryCode
+ ", shippingAddress: " + shippingAddress + "]";
}
}
public static class Payer{
private String paymentMethod;
private String status;
private PayerInfo payerInfo;
public Payer() {
}
public String getPaymentMethod(){
return paymentMethod;
}
public void setPaymentMethod(String input){
this.paymentMethod = input;
}
public String getStatus(){
return status;
}
public void setStatus(String input){
this.status = input;
}
public PayerInfo getPayerInfo(){
return payerInfo;
}
public void setPayerInfo(PayerInfo input){
this.payerInfo = input;
}
@Override
public String toString() {
return "Payer [paymentMethod: " + paymentMethod + ", status: " + status + ", payerInfo: " + payerInfo + "]";
}
}
public static class Amount{
private String total;
private String currency;
private Details details;
public Amount() {
}
public String getTotal(){
return total;
}
public void setTotal(String input){
this.total = input;
}
public String getCurrency(){
return currency;
}
public void setCurrency(String input){
this.currency = input;
}
public Details getDetails(){
return details;
}
public void setDetails(Details input){
this.details = input;
}
@Override
public String toString() {
return "Amount [total: " + total + ", currency: " + currency + ", details: " + details + "]";
}
}
public static class ItemList{
public ItemList() {
}
}
public static class Details{
private String subtotal;
private String shipping;
private String handlingFee;
private String insurance;
private String shippingDiscount;
public Details() {
}
public String getSubtotal(){
return subtotal;
}
public void setSubtotal(String input){
this.subtotal = input;
}
public String getShipping(){
return shipping;
}
public void setShipping(String input){
this.shipping = input;
}
public String getHandlingFee(){
return handlingFee;
}
public void setHandlingFee(String input){
this.handlingFee = input;
}
public String getInsurance(){
return insurance;
}
public void setInsurance(String input){
this.insurance = input;
}
public String getShippingDiscount(){
return shippingDiscount;
}
public void setShippingDiscount(String input){
this.shippingDiscount = input;
}
@Override
public String toString() {
return "Details [subtotal: " + subtotal + ", shipping: " + shipping + ", handlingFee: " + handlingFee
+ ", insurance: " + insurance + ", shippingDiscount: " + shippingDiscount + "]";
}
}
public static class Sale{
private String id;
private String state;
private String paymentMode;
private String protectionEligibility;
private String parentPayment;
private String createTime;
private String updateTime;
private Amount amount;
public Sale() {
}
public String getId(){
return id;
}
public void setId(String input){
this.id = input;
}
public String getState(){
return state;
}
public void setState(String input){
this.state = input;
}
public String getPaymentMode(){
return paymentMode;
}
public void setPaymentMode(String input){
this.paymentMode = input;
}
public String getProtectionEligibility(){
return protectionEligibility;
}
public void setProtectionEligibility(String input){
this.protectionEligibility = input;
}
public String getParentPayment(){
return parentPayment;
}
public void setParentPayment(String input){
this.parentPayment = input;
}
public String getCreateTime(){
return createTime;
}
public void setCreateTime(String input){
this.createTime = input;
}
public String getUpdateTime(){
return updateTime;
}
public void setUpdateTime(String input){
this.updateTime = input;
}
public Amount getAmount(){
return amount;
}
public void setAmount(Amount input){
this.amount = input;
}
@Override
public String toString() {
return "Sale [id: " + id + ", state: " + state + ", paymentMode: " + paymentMode + ", protectionEligibility: "
+ protectionEligibility + ", parentPayment: " + parentPayment + ", createTime: " + createTime
+ ", updateTime: " + updateTime + ", amount: " + amount + "]";
}
}
public static class RelatedResources{
private Sale sale;
public RelatedResources() {
}
public Sale getSale(){
return sale;
}
public void setSale(Sale input){
this.sale = input;
}
@Override
public String toString() {
return "RelatedResources [sale: " + sale + "]";
}
}
public static class Transactions{
private Amount amount;
private ItemList itemList;
private List<RelatedResources> relatedResources;
public Transactions() {
}
public Amount getAmount(){
return amount;
}
public void setAmount(Amount input){
this.amount = input;
}
public ItemList getItemList(){
return itemList;
}
public void setItemList(ItemList input){
this.itemList = input;
}
public List<RelatedResources> getRelatedResources(){
return relatedResources;
}
public void setRelatedResources(List<RelatedResources> input){
this.relatedResources = input;
}
@Override
public String toString() {
return "Transactions [amount: " + amount + ", itemList: " + itemList + ", relatedResources: "
+ relatedResources + "]";
}
}
@Override
public String toString() {
return "JSONObjFromPaypalTrx [id: " + id + ", intent: " + intent + ", state: " + state + ", cart: " + cart
+ ", createTime: " + createTime + ", payer: " + payer + ", transactions: " + transactions + "]";
}
}
这是 jsonPaypalTrx 的日志:
jsonPaypalTrx: JSONObjFromPaypalTrx [id: PAYID-LXJIHMI92J52777N04488909, intent: Sale, state: approved, cart: 25M35194DL227451S, createTime: 2019-11-18T11:42:41Z, payer: null, transactions: null]
不完整的jsonPaypalTrx是因为我在JSONObjFromPaypalTrx中使用了内部类吗？将每个内部类拆分为单独的 Java 文件对我来说会很尴尬。
感谢您的帮助。
鲍勃
最佳答案
给定 JSON 负载使用混合命名约定:驼峰式大小写和 UPPER_CAMEL_CASE 用于 JSON 对象。因此，您需要实现自己的 FieldNamingStrategy:
class PayPalFieldNamingStrategy implements FieldNamingStrategy {
@Override
public String translateName(Field f) {
return f.getType() == String.class ? f.getName() : FieldNamingPolicy.UPPER_CAMEL_CASE.translateName(f);
}
}
然后像下面这样注册:
Gson gson = new GsonBuilder()
.setFieldNamingStrategy(new PayPalFieldNamingStrategy())
.create();
或者，对于每个对象声明名称如下:
@SerializedName("Payer")
private Payer payer;
关于java - 将 Paypal Checkout 交易转换为 Java 对象？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/58943604/