Jackson反序列化：自定义对象工厂

Question

如何基于json中指定的类类型，在Jackson中实现从json到Java对象的转换。

Java类型示例：

public class Car{
    public String make;
    public String model;
}

public class Spoon {
    public String material;
}

public class Ownership {
    public List<Object> items;
    public User owner;
}

{
    "items": [
        {
            "@class": "com.example.Car",
            "make": "Mercedes-Benz",
            "model": "S500"
        },
        {
            "@class": "com.example.Spoon",
            "material": "silver"
        }            
    ],
    "owner": {
        "name": "John"
    }
}

Answer 1

可以使用集合上的注释来解决：

@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS,
              include = JsonTypeInfo.As.PROPERTY,
              property = "@class")
public List<Object> items;