基于类型密钥解组动态JSON

type BigStruct struct {    SomeData     string      `json:"some_data"`    DynamicField DynamicType `json:"dynamic_field"`    OtherData    string      `json:"other_data"`}type DynamicType struct {    Value interface{}}func (d *DynamicType) UnmarshalJSON(data []byte) error {    var typ struct {        Type string `json:"type"`    }    if err := json.Unmarshal(data, &typ); err != nil {        return err    }    switch typ.Type {    case "A":        d.Value = new(TypeA)    case "B":        d.Value = new(TypeB)    }    return json.Unmarshal(data, d.Value)}type TypeA struct {    Name string `json:"name"`}type TypeB struct {    Address string `json:"address"`}

https://play.golang.com/p/oKMKQTdzp7s

如果您不想或不能更改DynamicField的类型，则可以将UnmarshalJSON方法放在BigStruct上，并声明一个临时类型以避免递归。

func (b *BigStruct) UnmarshalJSON(data []byte) error {    var typ struct {        DF struct { Type string `json:"type"`        } `json:"dynamic_field"`    }    if err := json.Unmarshal(data, &typ); err != nil {        return err    }    switch typ.DF.Type {    case "A":        b.DynamicField = new(DynamicTypeA)    case "B":        b.DynamicField = new(DynamicTypeB)    }    type tmp BigStruct // avoids infinite recursion    return json.Unmarshal(data, (*tmp)(b))}

https://play.golang.com/p/at5Okp3VU2u