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 Config
c.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 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?
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"`
}
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