java - Android retrofit2通过 jackson 发送json

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How to tell Jackson to ignore a field during serialization if its value is null?
                                
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我有一个User类，看起来像这样：

public class User implements Serializable {

    @JsonProperty("image")
    private UserImage image;

    @JsonProperty("email")
    private String email;

    @JsonProperty("mobilePhone")
    private String mobilePhone;

    @JsonProperty("firstname")
    private String firstName;

    @JsonProperty("lastname")
    private String lastName;

    @JsonProperty("codeCreatedAt")
    private String codeCreatedAt;

    @JsonProperty("accountSettings")
    private AccountSettings accountSettings;

    @JsonProperty("status")
    private String status;

    @JsonProperty("created")
    private String created;

    @JsonProperty("id")
    private String id;

    public User(String lastName, String firstName, String mobilePhone) {
        this.lastName = lastName;
        this.firstName = firstName;
        this.mobilePhone = mobilePhone;
    }

    public User() {
    }

    public User(UserImage image, String email, String mobilePhone, String firstName, String lastName, String codeCreatedAt, AccountSettings accountSettings, String status, String created, String id) {
        this.image = image;
        this.email = email;
        this.mobilePhone = mobilePhone;
        this.firstName = firstName;
        this.lastName = lastName;
        this.codeCreatedAt = codeCreatedAt;
        this.accountSettings = accountSettings;
        this.status = status;
        this.created = created;
        this.id = id;
    }
}

我正在尝试发送Json，例如：{"mobilePhone":"123456789","lastname":"test","firstname":"test"}

我使用具有3个参数的构造函数创建了一个新用户，但它基于具有所有参数的构造函数生成JSON。我需要更改以获得所需的JSON吗？

最佳答案

将@JsonInclude(JsonInclude.Include.NON_NULL)添加到类中

@JsonInclude(JsonInclude.Include.NON_NULL)
public class User implements Serializable {...}