使用Jackson将无嵌套Json转嵌套对象

例如

{age: 18, lastname: "Liu", firstname: "Ryan"}

转成

class Person {
    private int age;
    private Name name;
}
class Name {
    private String lastname;
    private String firstname;
}

只需使用@JsonUnwrapped

class Person {
    private int age;
    @JsonUnwrapped
    private Name name;
}