对于FasterXML的Jackon JSON开发人员来说,这是一个普遍的问题。当我遇到类似的POJO时,我遇到了它:

package net.package.dogs.retrievers

@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, include = JsonTypeInfo.As.PROPERTY, property = "family")
@JsonSubTypes(value = {
    @JsonSubTypes.Type(value = LabradorRetriever.class),
    @JsonSubTypes.Type(value = GoldenRetriever.class)
})
public abstract class Retriever {
    private String name;
    private Color color;

    public Retriever() {}

    public Retriever(String name, Color color) {
        this.name = name;
        this.color = color;
    }

    public String bark() {
        return "You can't hear me but I'm barking";
    }
}


package net.package.dogs.retrievers

public class LabradorRetriever extends Retriever {
    public LabradorRetriever() {
        super();
    }

    public LabradorRetriever(String name, Color color) {
        super(name, color);
    }

    public String bark() {
        return "Ruff! Ruff!";
    }

    public String fetchDucks() {
        return "ufff...";
    }
}


package net.package.dogs.retrievers

public class GoldenRetriever extends Retriever {

    public GoldenRetriever() {
        super();
    }

    public GoldenRetriever(String name, Color color) {
        super(name, color);
    }

    public String bark() {
        return "Wruuff! Wruff!";
    }
}


public enum Color {
    YELLOW,
    CHOCOLATE,
    BLACK
}


此类与以下JSON消息匹配...



{
    "family" : "net.package.dogs.retrievers.GoldenRetriever",
    "name" : "Goldie",
    "color" : "YELLOW"
}


{
    "family" : "net.package.dogs.retrievers.LabradorRetriever",
    "name" : "Cookie",
    "color" : "CHOCOLATE"
}


但是,我希望有一个不同的“种族”,如下所示。

{
    "family" : "GOLDEN_RETRIEVER",
    "name" : "Goldie",
    "color" : "YELLOW"
}




{
    "family" : "LABRADOR_RETRIEVER",
    "name" : "Cookie",
    "color" : "CHOCOLATE"
}


如何填写JsonTypeInfoJsonSubTypes来匹配此先前的JSON消息?

最佳答案

这是您可以完成此操作的一种方法:


更改@JsonTypeInfo以使用JsonTypeInfo.Id.NAME

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, ...

添加@JsonTypeName进行名称解析:

@JsonTypeName("LABRADOR_RETRIEVER")
public class LabradorRetriever extends Retriever {

08-16 20:16