java - Jackson Json 到 POJO 的映射

Question

我在与 jackson 创建映射时有点迷失。我的 Json 具有以下结构

    {
  "d": {
    "__metadata": {
      "uri": "https://apisalesdemo8.successfactors.com:443/odata/v2/JobApplication(1463L)",
      "type": "SFOData.JobApplication"
    },
    "lastName": "K",
    "address": "123 Main Street",
    "cellPhone": "12345",
    "firstName": "Katrin",
    "city": "Anytown",
    "country": "United States",
    "custappattachment": {
      "results": [
        {
          "__metadata": {
            "uri": "https://apisalesdemo8.successfactors.com:443/odata/v2/Attachment(1188L)",
            "type": "SFOData.Attachment"
          },
          "fileExtension": "jpeg",
          "fileName": "hp-hero-img.jpeg",
          "fileContent": "/9j/4AA"
        },
        {
          "__metadata": {
            "uri": "https://apisalesdemo8.successfactors.com:443/odata/v2/Attachment(1189L)",
            "type": "SFOData.Attachment"
          },
          "fileExtension": "jpeg",
          "fileName": "hp-content-bkgd-img.jpeg",
          "fileContent": "/9j/4AAQSk"
        }]}}}

我确实找到了很多处理数组的教程，但我在第一个标记“d”时就失败了。并且根本不需要所有“__metadata” token 。

我创建了一个 pojo，其中包含诸如姓氏等属性和一个集合附件。但我的代码总是在标记“d”或“__metadata”处失败

public class ResponseDataObject {


    private String lastName;
    private String address;
    private String cellPhone;
    private String firstName;
    private String city;
    private String country;
    private List<Attachment> attachments = new ArrayList<>();
    .....getters and setters

和 jackson 阅读器

    ObjectReader objectReader =
    mapper.readerFor(ResponseDataObject.class);
    ResponseDataObject dataObject = objectReader.readValue(file);

如有任何提示，我们将不胜感激。

问候马蒂亚斯

Answer 1

您可以使用@JsonIgnoreProperties注释来忽略与类中定义的任何成员不匹配的属性，例如:

@JsonIgnoreProperties(ignoreUnknown = true)
public class ResponseDataObject {

这将确保映射所有匹配的属性并忽略其他属性。