Question

我正尝试将Json转换为Java对象。我有一个名为' result '的字符串，我想将其转换为类为 TransferRecord.java < / strong>

这是我用作输入的字符串的一部分。

{ "TransferRecord": { "TransferId": { "TransferRef": "string", "DistributorRef": "string" }, "SkuCode": "string", "Price": { "CustomerFee": 0, "DistributorFee": 0, "ReceiveValue": 0, "ReceiveCurrencyIso": "string", "ReceiveValueExcludingTax": 0, "TaxRate": 0, "TaxName": "string", "TaxCalculation": "string", "SendValue": 0, "SendCurrencyIso": "string" }, "CommissionApplied": 0, "StartedUtc": "2019-01-31T10:10:20.527Z", "CompletedUtc": "2019-01-31T10:10:20.527Z", "ProcessingState": "string", "ReceiptText": "string", "ReceiptParams": {}, "AccountNumber": "string" }, "ResultCode": 0, "ErrorCodes": [ { "Code": "string", "Context": "string" } ] }

这是TransferRecord类。我检查了json映射，它们完全相同。请注意，类中有更多字段可用，但我只是粘贴了一部分。输入字符串和java类的属性数相同。

public class TransferRecord { @JsonProperty("TransferId") private TransferId transferId = null; @JsonProperty("SkuCode") private String skuCode = null; @JsonProperty("Price") private Price price = null; @JsonProperty("CommissionApplied") private BigDecimal commissionApplied = null; @JsonProperty("StartedUtc") private Date startedUtc = null; @JsonProperty("CompletedUtc") private Date completedUtc = null; @JsonProperty("ProcessingState") private String processingState = null; @JsonProperty("ReceiptText") private String receiptText = null; @JsonProperty("ReceiptParams") private Map<String, String> receiptParams = null; @JsonProperty("AccountNumber") private String accountNumber = null; public TransferRecord transferId(TransferId transferId) { this.transferId = transferId; return this; } }

以下是我用于转换的代码。请注意，这三段代码将达到相同的目的，因此我分别进行了尝试。

ObjectMapper mapper = new ObjectMapper(); //1 TransferRecord objTransRecord = mapper.readValue(result, TransferRecord.class); //2 TransferRecord objTransRecord = mapper.readerWithView(TransferRecord.class).forType(TransferRecord.class).readValue(result); //3 TransferRecord objTransRecord = mapper.readerFor(TransferRecord.class).readValue(result);

问题是当我尝试创建对象时，即使String中有相应的数据，在所有三种方法中，每个值都设置为 null 。有人可以指出我在这里做错了吗？

先谢谢了。：）

Answer 1

首先，json应该是：

{
    "TransferId": {
      "TransferRef": "string",
      "DistributorRef": "string"
    },
    "SkuCode": "string",
    "Price": {
      "CustomerFee": 0,
      "DistributorFee": 0,
      "ReceiveValue": 0,
      "ReceiveCurrencyIso": "string",
      "ReceiveValueExcludingTax": 0,
      "TaxRate": 0,
      "TaxName": "string",
      "TaxCalculation": "string",
      "SendValue": 0,
      "SendCurrencyIso": "string"
    },
    "CommissionApplied": 0,
    "StartedUtc": "2019-01-31T10:10:20.527Z",
    "CompletedUtc": "2019-01-31T10:10:20.527Z",
    "ProcessingState": "string",
    "ReceiptText": "string",
    "ReceiptParams": {},
    "AccountNumber": "string"
  }

第二，也许您应该为每个字段添加getter和setter方法。

Answer 2

使用toString方法直接打印值并按如下所示构造类

ObjectMapper mapper = new ObjectMapper();

        Data data = mapper.readValue(string, Data.class);

        System.out.println(data);

数据类

public class Data {
    @JsonProperty("TransferRecord")
    private TransferRecord transferRecord;

    @JsonProperty("ResultCode")
    private int
    resultCode;

    @JsonProperty("ErrorCodes")
    private List<ErrorCode> errorCodes;

    @Override
    public String toString() {
        return "Data [transferRecord=" + transferRecord + ", resultCode=" + resultCode + ", errorCodes=" + errorCodes
                + "]";
    }
}

错误代码类别：

public class ErrorCode {
    @JsonProperty("Code")
    private String code;

    @JsonProperty("Context")
    private String context;

    @Override
    public String toString() {
        return "ErrorCode [code=" + code + ", context=" + context + "]";
    }
}

TransferRecord类：

public class TransferRecord {
    @JsonProperty("TransferId")
    private TransferId transferId;

    @JsonProperty("SkuCode")
    private String skuCode;

    @JsonProperty("Price")
    private Price price;

    @JsonProperty("CommissionApplied")
    private BigDecimal commissionApplied;

    @JsonProperty("StartedUtc")
    private Date startedUtc;

    @JsonProperty("CompletedUtc")
    private Date completedUtc;

    @JsonProperty("ProcessingState")
    private String processingState;

    @JsonProperty("ReceiptText")
    private String receiptText;

    @JsonProperty("ReceiptParams")
    private Map<String, String> receiptParams;

    @JsonProperty("AccountNumber")
    private String accountNumber;

    @Override
    public String toString() {
        return "TransferRecord [transferId=" + transferId + ", skuCode=" + skuCode + ", price=" + price
                + ", commissionApplied=" + commissionApplied + ", startedUtc=" + startedUtc + ", completedUtc="
                + completedUtc + ", processingState=" + processingState + ", receiptText=" + receiptText
                + ", receiptParams=" + receiptParams + ", accountNumber=" + accountNumber + "]";
    }
}

TransferId类别：

public class TransferId {
    @JsonProperty("TransferRef")
    private String transferRef;

    @JsonProperty("DistributorRef")
    private String distributorRef;

    @Override
    public String toString() {
        return "TransferId [transferRef=" + transferRef + ", distributorRef=" + distributorRef + "]";
    }
}

价格等级：

public class Price {
    @JsonProperty("CustomerFee")
    private int customerFee;

    @JsonProperty("DistributorFee")
    private int distributorFee;

    @JsonProperty("ReceiveValue")
    private int receiveValue;

    @JsonProperty("ReceiveCurrencyIso")
    private String receiveCurrencyIso;

    @JsonProperty("ReceiveValueExcludingTax")
    private int receiveValueExcludingTax;

    @JsonProperty("TaxRate")
    private int taxRate;

    @JsonProperty("TaxName")
    private String taxName;

    @JsonProperty("TaxCalculation")
    private String taxCalculation;

    @JsonProperty("SendValue")
    private int sendValue;

    @JsonProperty("SendCurrencyIso")
    private String sendCurrencyIso;

    @Override
    public String toString() {
        return "Price [customerFee=" + customerFee + ", distributorFee=" + distributorFee + ", receiveValue="
                + receiveValue + ", receiveCurrencyIso=" + receiveCurrencyIso + ", receiveValueExcludingTax="
                + receiveValueExcludingTax + ", taxRate=" + taxRate + ", taxName=" + taxName + ", taxCalculation="
                + taxCalculation + ", sendValue=" + sendValue + ", sendCurrencyIso=" + sendCurrencyIso + "]";
    }
}

Answer 3

这不是TransferRecord类。您的json提取类包含3个字段：

public class Something {
    @JsonProperty("TransferRecord")
    private TransferRecord transferRecord;
    @JsonProperty("ResultCode")
    private int resultCode;
    @JsonProperty("ErrorCodes")
    private List<ErrorCode> errorCodes;
}

将json转换为Java对象-属性设置为Null

3 个答案: