如何在Go1.9中解码json字符串以进行sync.Map而非法线映射？

I can decode json strings to a map with go language like this:

func main(){
  date := []byte(`{"127.1":{"host":"host1","list":["list123","list456"]},"127.2":{"host":"host2","list":["list223","list256"]}}`)
  var x interface{}
  json.Unmarshal(date, &x)
  t := x.(map[string]interface{})
  var aa []interface{}
  aa = (t["127.2"].(map[string]interface{})["list"])
  for _, v := range aa {
     fmt.Println(v.(string))
  }
}

but I wonder how to decode it to a sync.Map in Go1.9. I have tried many ways but failed, can anyone help me?

I tried like this:

    func main(){
      date := []byte(`{"127.1":{"host":"host1","list":["list123","list456"]},"127.2":{"host":"host2","list":["list223","list256"]}}`)
      var x interface{}
      json.Unmarshal(date, &x)
      t := x.((sync.Map)[string]interface{})  //compile error
}

Also I tried like this:

    func main(){
      date := []byte(`{"127.1":{"host":"host1","list":["list123","list456"]},"127.2":{"host":"host2","list":["list223","list256"]}}`)
      var x sync.Map
      json.Unmarshal(date, &x)
      fmt.Println(x) // but the map has nothing
}

You cannot directly unmarshal into a sync.Map, because sync.Map has no exported fields (so the Unmarshaler doesn't have any way to store data in it), and it doesn't implement the json.Unmarshaler interface.

So you'll have to handle this yourself, probably by including a sync.Map in a type of your own, and implementing json.Unmarshaler on that type:

type Foo struct {
    sync.Map
}

func (f *Foo) UnmarshalJSON(data []byte) error {
    var tmpMap map[string]interface{}
    if err := json.Unmarshal(data, &tmpMap); err != nil {
        return err
    }
    for key, value := range tmpMap {
        f.Store(key, value)
    }
    return nil
}

In case you need a snippet to do it another way around

func (f Foo) MarshalJSON() ([]byte, error) {
    tmpMap := make(map[YourTypeOfKey]YourTypeOfValue)
    f.Range(func(k, v interface{}) bool {
        tmpMap[k.(YourTypeOfKey)] = v.(YourTypeOfValue)
        return true
    })
    return json.Marshal(tmpMap)
}