java - 来自 Jackson 库的 UnrecognizedPropertyException

Question

我有 JSON paylaod 如下:

{
  "status": "ok",
  "result": {
    "result": [
      {
        "product_id": "1420-131617-82",
        "sku": "1420-131617",
        "display_sku": "8DD 355 100-411",
        "genart_number": 82,
        "name": "Bremsscheibe",
        "description": null,
        "additional_info_text": null,
        "product_url": "https://www.autoteile5000.de/product/1420-131617-82",
        "image_url": "https://static.autoteile5000.de/product-images/HLP/4625-462502682-3-255-1548045462267.jpg",
        "brand": "HELLA PAGID",
        "eans": [
          "4082300365078"
        ],
        "manufacturer_product_number": "8DD 355 100-411",
        "data_supplier_number": "4625",
        "pricehammer": false,
        "buyable": true,
        "bulky_good": false,
        "risky_good": false,
        "hazardous_good": false,
        "car_specific": true,
        "has_deposit": false,
        "is_exchange_part": false,
        "visibility_status": "active",
        "deleted": false
      }
    ]
  }
}

这是我反序列化它的方法:

public List<SimpleProductDto> getProducts(ProductForm productForm) {

    JsonParser jsonParser = new JsonParser();
    try (InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("data/product/2210-0929-818/product.json") ) {
        String text = IOUtils.toString(inputStream, StandardCharsets.UTF_8.name());
        //System.out.println("print text : " + text);
        //Read JSON file
        JsonObject objectFromString = jsonParser.parse(text).getAsJsonObject();
       // System.out.println(objectFromString.toString());

        JsonObject objectFromString1 = objectFromString.getAsJsonObject("result");
       // System.out.println(objectFromString.toString());

       // System.out.println(objectFromString1.toString());

        JsonArray jsonArray = objectFromString1.getAsJsonArray("result");
        System.out.println("printing json array : " +jsonArray.toString());

        ObjectMapper oMapper = new ObjectMapper();
        for(JsonElement element : jsonArray){
            JsonObject productObj = element.getAsJsonObject();
            System.out.println("printing json object : " + productObj.toString());
            SimpleproductDtoMapper productDtoList = oMapper.readValue(productObj.toString(), SimpleproductDtoMapper.class);
        }
      // List<SimpleproductDtoMapper> productDtoList = oMapper.readValue(jsonArray.toString(), new TypeReference<List<SimpleproductDtoMapper>>() {});

       // Map<String, SimpleproductDtoMapper> items = productDtoList.stream().collect(Collectors.toMap(SimpleproductDtoMapper::getProductId, Function.identity()));

        //items.forEach((k, v) -> System.out.println("Item : " + k + " Count : " + v));

        //Iterate over employee array
        //productList.forEach(emp -> parseProductObject((JSONObject) emp));

    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

这是我的POJO:

public class SimpleproductDtoMapper {

@SerializedName("product_id")
private String productId;
private String sku;
@SerializedName("display_sku")
private String displaySku;
@SerializedName("genart_number")
private Integer genartNumber;
private String name;
private String description;
@SerializedName("additional_info_text")
private String additionalInfoText;
@SerializedName("product_url")
private String productUrl;
@SerializedName("image_url")
private String imageUrl;
private String brand;
private List<String> eans;
@SerializedName("manufacturer_product_number")
private String manufacturerProductNumber;
@SerializedName("data_supplier_number")
private String dataSupplierNumber;
private boolean pricehammer;
private boolean buyable;
@SerializedName("bulky_good")
private boolean bulkyGood;
@SerializedName("risky_good")
private boolean riskyGood;
@SerializedName("hazardous_good")
private boolean hazardousGood;
@SerializedName("car_specific")
private boolean carSpecific;
@SerializedName("has_deposit")
private boolean hasDeposit;
@SerializedName("is_exchange_part")
private boolean isExchangePart;
@SerializedName("visibility_status")
private VisibilityStatusDto visibilityStatus;
@SerializedName("deleted")
private boolean deleted;
}

我得到以下异常:

at [Source: (String)"{"product_id":"1420-131617-82","sku":"1420-131617","display_sku":"8DD 355 100-411","genart_number":82,"name":"Bremsscheibe","description":null,"additional_info_text":null,"product_url":"https://www.autoteile5000.de/product/1420-131617-82","image_url":"https://static.autoteile5000.de/product-images/HLP/4625-462502682-3-255-1548045462267.jpg","brand":"HELLA PAGID","eans":["4082300365078"],"manufacturer_product_number":"8DD 355 100-411","data_supplier_number":"4625","pricehammer":false,"buyable":tr"[truncated 174 chars]; line: 1, column: 16] (through reference chain: com.kfz24.mockingservice.mapper.SimpleproductDtoMapper["product_id"]) at com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException.from(UnrecognizedPropertyException.java:61) at com.fasterxml.jackson.databind.DeserializationContext.handleUnknownProperty(DeserializationContext.java:823) at com.fasterxml.jackson.databind.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:1153) at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperty(BeanDeserializerBase.java:1589) at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownVanilla(BeanDeserializerBase.java:1567) at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:294) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:151) at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4013) at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3004) at com.kfz24.mockingservice.service.impl.MockingProductServiceImpl.getProducts(MockingProductServiceImpl.java:49) at com.kfz24.mockingservice.controller.MockingProductController.getProducts(MockingProductController.java:29)

Answer 1

因为 @SerializedName 来自 Gson 而不是 Jackson 。Jackson 中的等效项是 @JsonProperty。

因此将所有@SerializedName更改为@JsonProperty。另外，Jackson 默认情况下仅反序列化未用 @JsonProperty 标记的公共(public)字段。

所以对你来说，我建议最简单的方法是确保所有字段都用 @JsonProperty 标记(例如名称、品牌等)