java Spring @RequestBody 包含不同类型的列表（但接口相同）
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Spring @RequestBody containing a list of different types (but same interface)
提问by Viktor K.
Let's say that I have a domain class :
假设我有一个域类：
public class Zoo{
private List<Animal> animals;
....
where an Animal is an interface with different implementations (Cat,Dog). Let's say that I want to be able to save a Zoo object :
其中 Animal 是具有不同实现（Cat、Dog）的接口。假设我希望能够保存 Zoo 对象：
@RequestMapping(value = "/zoo", method = RequestMethod.POST)
public @ResponseBody void save(@RequestBody Zoo zoo) {
....
and I want to send a json - something like :
我想发送一个 json - 类似于：
{
animals:[
{type:'Cat', whiskers-length:'3'},
{type:'Dog', name:'Fancy'}
]
}
How can I tell spring MVC to map animal to Cat type when type=='Cat' and to map it to a Dog class when type=='Dog'?
我如何告诉 Spring MVC 在 type=='Cat' 时将动物映射到 Cat 类型，并在 type=='Dog' 时将其映射到 Dog 类？
回答by nicholas.hauschild
You should use the Hymanson annotations @JsonTypeInfoand @JsonSubTypesto achieve polymorphic json. The annotations go on the Animalbase class.
您应该使用 Hymanson 注释@JsonTypeInfo并@JsonSubTypes实现多态 json。注释在Animal基类上。
@JsonTypeInfo(use = Id.NAME, include = As.PROPERTY, property = "type")
@JsonSubTypes({@JsonSubTypes.Type(value = Dog.class, name = "Dog"),
@JsonSubTypes.Type(value = Cat.class, name = "Cat")})
public abstract class Animal {
}
回答by Prancer
There is a simpler annotation out now:
现在有一个更简单的注释：
@JsonRootName("dog")
public class Dog extends Animal {...}
The reference to the annotation can be found on fasterxml.github
注释的参考可以在fasterxml.github上找到
