英文:
Casting interface{} to struct in json encoding
问题
我有这样的代码：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 Configc.Application = &MysqlConf{}err := dec.Decode(&c)if err != nil {fmt.Println(err)}}
我不知道为什么结果的结构体是空的。你有什么想法吗？
英文:
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 Configc.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?
答案1
得分: 5
你在MysqlConf结构体中没有导出values字段，所以json包无法使用它。使用大写字母来命名变量以解决这个问题：
type MysqlConf struct {Values map[string]string `json:"mysql"`}
英文:
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"`}
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论