golang加载配置文件之json配置

加载json相对来说比较简单，不需要第三方包，用内置os包即可

config.json

{
  "app_name": "my_project",
  "env": ["dev", "test", "product"],
  "app": {
    "path": "/www/root"
  },
  "mysql": {
    "host": "127.0.0.1",
    "name": "root",
    "password": "123456",
    "port": 3306
  }
}

main.go

package main

import (
   "encoding/json"
   "fmt"
   "log"
   "os"
)

type Config struct {
   AppName string `json:"app_name"`
   Env     []string
   App     *App
   Mysql   *Mysql
}

type App struct {
   Path string
}

type Mysql struct {
   Host     string
   Name     string
   Password string
   Port     int16
}

func main() {
   file, _ := os.Open("config.json")
   defer file.Close()
   decoder := json.NewDecoder(file)
   var c Config
   err := decoder.Decode(&c)
   if err != nil {
      log.Fatal(err)
      return
   }
   fmt.Printf("%s, %v, %v, %v", c.AppName, c.Env, c.App, c.Mysql)
}