SpringBoot:请求带有继承的主体 [英] SpringBoot: Request body with inheritance

问题描述

我有以下课程

public class Car {
     private String make; 
     private String model; 
     
     private TransmissionType transmissionType; // Manual/Automatic
     private Transmission transmission; 
}

public class Transmission {
}

public class AutomaticTransmission {
     public Technology technology; // DCT/CVT/AMT
}

public class ManualTransmission {
     public int numGears; 
}

在这个例子中，当有效载荷传递可能是

In this example, when the payload passed could be

{
    "make": "Toyota", 
    "model": "Iris", 
    "transmissionType": "Automatic", 
    "transmission" {
         "technology": "DCT"
    }
}

也可以

{
    "make": "Merc", 
    "model": "C", 
    "transmissionType": "Manual", 
    "transmission" {
         "numGears": 5
    }
}

当它作为主体传递给控制器​​时，它应该能够创建相应的类.我如何实现这一目标.

When this is passed to controller as body, it should be able to create respective class. How do I achieve this.

我尝试使用 JsonTypeInfo 和 JsonSubTypes，如 this answer 但它需要我在 Transmission 类中移动 transmissionType，这对我来说不是这种情况.

I tried using JsonTypeInfo and JsonSubTypes as shown in this answer but it necessitates me to move transmissionType within Transmission class, which is not the case for me.

推荐答案

您正在寻找 @JsonTypeInfo(include = As.EXTERNAL_PROPERTY) 传输传输.这告诉 Jackson 在包含对象中查找定义类型的属性.

You're looking for @JsonTypeInfo(include = As.EXTERNAL_PROPERTY) Transmission transmission. This tells Jackson to look for the property that defines the type in the containing object.

也就是说，如果您有机会更改 JSON 形状，则应避免使用外部标记类型"；像这样，将type属性放入对象中.

That said, if you have any opportunity of changing your JSON shape, you should avoid "externally tagged types" like this and put the type property into the object.

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