阅读Jackson中的嵌入对象

Question

我正在尝试使用Jackson 2.0-RC3读取遗留的JSON代码,但是我坚持使用"嵌入式"对象.

给出以下JSON:

{
    "title": "Hello world!",
    "date": "2012-02-02 12:23:34".
    "author": "username",
    "author_avatar": "http://.../",
    "author_group": 123,
    "author_prop": "value"
}

如何将其映射到以下结构中:

class Author {
    @JsonPropery("author")
    private String name;

    @JsonPropery("author_avatar")
    private URL avatar;

    @JsonProperty("author_group")
    private Integer group;

    ...
}

class Item {
    private String title;

    @JsonProperty("date")
    private Date createdAt;

    // How to map this?
    private Author author;
}

我试图这样做,@JsonDeserialize但似乎我必须以Item这种方式映射整个对象.

Answer 1

要处理你应该使用的"嵌入式"对象@JsonUnwrapped- 它等同于Hibernate的@Embeddable/ @Embedded.

class Item {
    private String title;

    @JsonProperty("date")
    private Date createdAt;

    // How to map this?
    @JsonUnwrapped
    private Author author;
}