如何在Go中从一个文件读取多个JSON对象

Question

How can I read a JSON file where there is two different objects using Unmarshal ?

JSON example:

This is the structure corresponding to the JSON file.

{
  "mysql": {
    "address": "127.0.0.1",
    "port": "3306",
    "user": "user",
    "password": "password",
    "database": "database"
  },
  "postgres": {
    "address": "127.0.0.2",
    "port": "3306",
    "user": "user2",
    "password": "password2",
    "database": "database2"
  }
}

Code snippet:

type Database struct {
    Address  string
    Port     string
    User     string
    Password string
    Database string
}
type Mysql struct {
    Database
}
type Postgres struct {
    Database
}

Answer 1

To do this, you need to wrap the Mysql and Postgres structure into a Configuration structure then pass it to Unmarshal function:

type Configuration struct {
    Mysql    Mysql
    Postgres Postgres
}

func main() {
    content, err := ioutil.ReadFile(confPath)
    var conf Configuration
    err = json.Unmarshal(content, &conf)
}

See full working example: https://play.golang.org./p/7CtALgsjK3

Hope this will help some people.