问题：
如何在flutter dart上解析复杂的json
巫懿轩
我从一个复杂的json中获取空数据，这里是json。当我试图解析它时，我得到了null。请看一看。
{
"billInfoList": [
{
"accountBalance": 0,
"address": {
"street": "nd",
"complement": "df",
"city": "dsfs",
"neighborhood": "cxcnx",
"isForcedAddress": false,
"state": "ARE",
"zip": "00000",
"country": "hchchc",
"district": "ccc"
},
"billDay": 0,
"billFrequency": 0,
"billNumber": "hcc",
"billType": 1cxc1,
"creationDate": "2019-02-04",
"dueDate": "2019-02-19",
"servicePeriodEnd": "2019-02-04",
"servicePeriodStart": "2019-01-29",
"status": "Paid",
"value": 0,
"valueDisputed": 0,
"valueOpen": 0
},
{
"accountBalance": 0,
"address": {
"street": "cxcvenciones ",
"complement": "Test124",
"city": "Arequipa",
"neighborhood": "Test4",
"isForcedAddress": false,
"state": "ARE",
"zip": "00320",
"country": "PE",
"district": "cquipa"
},
"billDay": 0,
"billFrequency": 0,
"billNumber": "dfs678",
"billType": fds1,
"billURL": "http://",
"creationDate": "2019-01-29",
"dueDate": "2019-02-13",
"servicePeriodEnd": "2019-01-29",
"servicePeriodStart": "2019-01-29",
"status": "Paid",
"value": 3.6,
"valueDisputed": 0,
"valueOpen": 0
},
{
"accountBalance": 0,
"address": {
"street": "fsdnciones ",
"complement": "Test124",
"city": "dfspa",
"neighborhood": "Test4",
"isForcedAddress": false,
"state": "ARE",
"zip": "3200",
"country": "PE",
"district": "requipa"
},
"billDay": 0,
"billFrequency": 0,
"billNumber": "323677",
"billType": 341,
"creationDate": "2019-01-29",
"dueDate": "2019-02-13",
"servicePeriodEnd": "2019-01-29",
"servicePeriodStart": "2019-01-29",
"status": "Pd",
"value": 0,
"valueDisputed": 0,
"valueOpen": 0
}
],
"TransactionSequenceId": "hrhrhrh9",
"ResponseCode": "hfhf00",
"ResponseMessage": "Request Processed successfully"
}
我已生成模型类：https://javiercbk.github.io/json_to_dart/
生成模型类后，创建一个新的类名ModelClass。
另一个类名为APiResponse并编写代码：这个类获取api响应并返回响应：APiResponse。fromJson（jsonDecode（response.body））；
我尝试解析：
APiResponse.fromJson(Map<String, dynamic> json)
: results = new ModelClass.fromJson(json),
error = "";
模型类：
class ModelClass {
List<BillInfoList> billInfoList;
String transactionSequenceId;
String responseCode;
String responseMessage;
ModelClass (
{this.billInfoList,
this.transactionSequenceId,
this.responseCode,
this.responseMessage});
ModelClass.fromJson(Map<String, dynamic> json) {
if (json['billInfoList'] != null) {
billInfoList = new List<BillInfoList>();
json['billInfoList'].forEach((v) {
billInfoList.add(new BillInfoList.fromJson(v));
});
}
transactionSequenceId = json['TransactionSequenceId'];
responseCode = json['ResponseCode'];
responseMessage = json['ResponseMessage'];
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
if (this.billInfoList != null) {
data['billInfoList'] = this.billInfoList.map((v) => v.toJson()).toList();
}
data['TransactionSequenceId'] = this.transactionSequenceId;
data['ResponseCode'] = this.responseCode;
data['ResponseMessage'] = this.responseMessage;
return data;
}
}
class BillInfoList {
int accountBalance;
Address address;
int billDay;
int billFrequency;
String billNumber;
int billType;
String creationDate;
String dueDate;
String servicePeriodEnd;
String servicePeriodStart;
String status;
double value;
int valueDisputed;
int valueOpen;
String billURL;
BillInfoList(
{this.accountBalance,
this.address,
this.billDay,
this.billFrequency,
this.billNumber,
this.billType,
this.creationDate,
this.dueDate,
this.servicePeriodEnd,
this.servicePeriodStart,
this.status,
this.value,
this.valueDisputed,
this.valueOpen,
this.billURL});
BillInfoList.fromJson(Map<String, dynamic> json) {
accountBalance = json['accountBalance'];
address =
json['address'] != null ? new Address.fromJson(json['address']) : null;
billDay = json['billDay'];
billFrequency = json['billFrequency'];
billNumber = json['billNumber'];
billType = json['billType'];
creationDate = json['creationDate'];
dueDate = json['dueDate'];
servicePeriodEnd = json['servicePeriodEnd'];
servicePeriodStart = json['servicePeriodStart'];
status = json['status'];
value = json['value'];
valueDisputed = json['valueDisputed'];
valueOpen = json['valueOpen'];
billURL = json['billURL'];
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['accountBalance'] = this.accountBalance;
if (this.address != null) {
data['address'] = this.address.toJson();
}
data['billDay'] = this.billDay;
data['billFrequency'] = this.billFrequency;
data['billNumber'] = this.billNumber;
data['billType'] = this.billType;
data['creationDate'] = this.creationDate;
data['dueDate'] = this.dueDate;
data['servicePeriodEnd'] = this.servicePeriodEnd;
data['servicePeriodStart'] = this.servicePeriodStart;
data['status'] = this.status;
data['value'] = this.value;
data['valueDisputed'] = this.valueDisputed;
data['valueOpen'] = this.valueOpen;
data['billURL'] = this.billURL;
return data;
}
}
class Address {
String street;
String complement;
String city;
String neighborhood;
bool isForcedAddress;
String state;
String zip;
String country;
String district;
Address(
{this.street,
this.complement,
this.city,
this.neighborhood,
this.isForcedAddress,
this.state,
this.zip,
this.country,
this.district});
Address.fromJson(Map<String, dynamic> json) {
street = json['street'];
complement = json['complement'];
city = json['city'];
neighborhood = json['neighborhood'];
isForcedAddress = json['isForcedAddress'];
state = json['state'];
zip = json['zip'];
country = json['country'];
district = json['district'];
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['street'] = this.street;
data['complement'] = this.complement;
data['city'] = this.city;
data['neighborhood'] = this.neighborhood;
data['isForcedAddress'] = this.isForcedAddress;
data['state'] = this.state;
data['zip'] = this.zip;
data['country'] = this.country;
data['district'] = this.district;
return data;
}
}
共有1个答案
百里嘉泽
您可以使用此链接从json生成模型类https://app.quicktype.io/
import 'dart:convert';
BillInfoList billInfoListFromJson(String str) => BillInfoList.fromJson(json.decode(str));
String billInfoListToJson(BillInfoList data) => json.encode(data.toJson());
class BillInfoList {
List<BillInfoListElement> billInfoList;
String transactionSequenceId;
String responseCode;
String responseMessage;
BillInfoList({
this.billInfoList,
this.transactionSequenceId,
this.responseCode,
this.responseMessage,
});
factory BillInfoList.fromJson(Map<String, dynamic> json) => BillInfoList(
billInfoList: List<BillInfoListElement>.from(json["billInfoList"].map((x) => BillInfoListElement.fromJson(x))),
transactionSequenceId: json["TransactionSequenceId"],
responseCode: json["ResponseCode"],
responseMessage: json["ResponseMessage"],
);
Map<String, dynamic> toJson() => {
"billInfoList": List<dynamic>.from(billInfoList.map((x) => x.toJson())),
"TransactionSequenceId": transactionSequenceId,
"ResponseCode": responseCode,
"ResponseMessage": responseMessage,
};
}
class BillInfoListElement {
int accountBalance;
Address address;
int billDay;
int billFrequency;
String billNumber;
dynamic billType;
DateTime creationDate;
DateTime dueDate;
DateTime servicePeriodEnd;
DateTime servicePeriodStart;
String status;
double value;
int valueDisputed;
int valueOpen;
String billUrl;
BillInfoListElement({
this.accountBalance,
this.address,
this.billDay,
this.billFrequency,
this.billNumber,
this.billType,
this.creationDate,
this.dueDate,
this.servicePeriodEnd,
this.servicePeriodStart,
this.status,
this.value,
this.valueDisputed,
this.valueOpen,
this.billUrl,
});
factory BillInfoListElement.fromJson(Map<String, dynamic> json) => BillInfoListElement(
accountBalance: json["accountBalance"],
address: Address.fromJson(json["address"]),
billDay: json["billDay"],
billFrequency: json["billFrequency"],
billNumber: json["billNumber"],
billType: json["billType"],
creationDate: DateTime.parse(json["creationDate"]),
dueDate: DateTime.parse(json["dueDate"]),
servicePeriodEnd: DateTime.parse(json["servicePeriodEnd"]),
servicePeriodStart: DateTime.parse(json["servicePeriodStart"]),
status: json["status"],
value: json["value"].toDouble(),
valueDisputed: json["valueDisputed"],
valueOpen: json["valueOpen"],
billUrl: json["billURL"] == null ? null : json["billURL"],
);
Map<String, dynamic> toJson() => {
"accountBalance": accountBalance,
"address": address.toJson(),
"billDay": billDay,
"billFrequency": billFrequency,
"billNumber": billNumber,
"billType": billType,
"creationDate": "${creationDate.year.toString().padLeft(4, '0')}-${creationDate.month.toString().padLeft(2, '0')}-${creationDate.day.toString().padLeft(2, '0')}",
"dueDate": "${dueDate.year.toString().padLeft(4, '0')}-${dueDate.month.toString().padLeft(2, '0')}-${dueDate.day.toString().padLeft(2, '0')}",
"servicePeriodEnd": "${servicePeriodEnd.year.toString().padLeft(4, '0')}-${servicePeriodEnd.month.toString().padLeft(2, '0')}-${servicePeriodEnd.day.toString().padLeft(2, '0')}",
"servicePeriodStart": "${servicePeriodStart.year.toString().padLeft(4, '0')}-${servicePeriodStart.month.toString().padLeft(2, '0')}-${servicePeriodStart.day.toString().padLeft(2, '0')}",
"status": status,
"value": value,
"valueDisputed": valueDisputed,
"valueOpen": valueOpen,
"billURL": billUrl == null ? null : billUrl,
};
}
class Address {
String street;
String complement;
String city;
String neighborhood;
bool isForcedAddress;
String state;
String zip;
String country;
String district;
Address({
this.street,
this.complement,
this.city,
this.neighborhood,
this.isForcedAddress,
this.state,
this.zip,
this.country,
this.district,
});
factory Address.fromJson(Map<String, dynamic> json) => Address(
street: json["street"],
complement: json["complement"],
city: json["city"],
neighborhood: json["neighborhood"],
isForcedAddress: json["isForcedAddress"],
state: json["state"],
zip: json["zip"],
country: json["country"],
district: json["district"],
);
Map<String, dynamic> toJson() => {
"street": street,
"complement": complement,
"city": city,
"neighborhood": neighborhood,
"isForcedAddress": isForcedAddress,
"state": state,
"zip": zip,
"country": country,
"district": district,
};
}
我希望这能奏效
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