强制转换界面{}以json编码进行结构化

I have such code: http://play.golang.org/p/aeEVLrc7q1

type Config struct { 
    Application interface{} `json:"application"`
}

type MysqlConf struct {
    values map[string]string `json:"mysql"`
}

func main() {
    const jsonStr = `
        {
            "application": {
                "mysql": {
                    "user": "root",
                    "password": "",
                    "host": "localhost:3306",
                    "database": "db"
                }   
            }
        }`

    dec := json.NewDecoder(strings.NewReader(jsonStr))
    var c Config 
    c.Application = &MysqlConf{}
    err := dec.Decode(&c)
    if err != nil {
        fmt.Println(err)
    }
}

And I don't know why resulting struct is empty. Do you have any ideas?

You did not export values in the MysqlConf structure, so the json package was not able to use it. Use a capital letter in the variable name to do so:

type MysqlConf struct {
    Values map[string]string `json:"mysql"`
}