使用go中的公共类型字段解组不同的JSON消息

package main

import (
    "encoding/json"
    "fmt"
)

type CommonFields struct {
    Type    string `json:"type"`
    Version int    `json:"version"`
}

type MessageA struct {
    CommonFields
    DataA string `json:"data_a"`
}

type MessageB struct {
    CommonFields
    DataB int `json:"data_b"`
}

func main() {
    jsonStrA := `{"type":"message_a","version":1,"data_a":"hello"}`
    jsonStrB := `{"type":"message_b","version":2,"data_b":42}`

    var msgA MessageA
    err := json.Unmarshal([]byte(jsonStrA), &msgA)
    if err != nil {
        fmt.Println("Error unmarshaling MessageA:", err)
    } else {
        fmt.Println("Unmarshaled MessageA:", msgA)
    }

    var msgB MessageB
    err = json.Unmarshal([]byte(jsonStrB), &msgB)
    if err != nil {
        fmt.Println("Error unmarshaling MessageB:", err)
    } else {
        fmt.Println("Unmarshaled MessageB:", msgB)
    }
}