相关疑难解决方法(0)

我有两个Java类,我想使用Jackson序列化为JSON:

public class User {
    public final int id;
    public final String name;

    public User(int id, String name) {
        this.id = id;
        this.name = name;
    }
}

public class Item {
    public final int id;
    public final String itemNr;
    public final User createdBy;

    public Item(int id, String itemNr, User createdBy) {
        this.id = id;
        this.itemNr = itemNr;
        this.createdBy = createdBy;
    }
}

我想将Item序列化为此JSON:

{"id":7, "itemNr":"TEST", "createdBy":3}

用户序列化只包括id.我还可以将所有用户对象serilize为JSON,如:

{"id":3, "name": "Jonas", "email": "jonas@example.com"}

所以我想我需要编写一个自定义序列化器Item并尝试使用它:

public class ItemSerializer …