本案例知识点为精品

同个目录下，两个文件完成案例，一个单元测试

json结构的数据(内容不重要，看结构)
imdata.go

{
   "im-cloud": {
     "addr": "127.0.0.1:8000",
     "orig": "http://127.0.0.1",
     "name": "im-cloud",
     "ws_uri": "/ws",
     "heartbeat_check_interval": 5
   },
   "im-server-s": {
     "im-server-7000": {
       "addr": "127.0.0.1:7000",
       "orig": "http://127.0.0.1",
       "name": "im-server-7000",
       "ws_uri": "/ws"
     },
     "im-server-9000": {
       "addr": "127.0.0.1:9000",
       "orig": "http://127.0.0.1",
       "name": "im-server-9000",
       "ws_uri": "/ws"
     }
   },
   "redis": {
     "addr": "127.0.0.1:6379"
   },
   "keys": {
     "im-server": "im-server",
     "jwt": "imstar",
     "im-client": "im-client"
   }
}

config.go

package config

import (
    "encoding/json"
    "fmt"
    "io/ioutil"
    "os"
)


type ImCloud struct {
    Addr string `json:"addr"`
    Orig string `json:"orig"`
    Name string `json:"name"`
    WsUri string `json:"ws_uri"`
    HeartbeatCheckInterval int `json:"heartbeat_check_interval"`
}
type ImServer struct {
    Addr string `json:"addr"`
    Orig string `json:"orig"`
    Name string `json:"name"`
    WsUri string `json:"ws_uri"`
}
type Keys struct {
    ImClient string `json:"im-client"`
    ImServer string `json:"im-server"`
    Jwt string `json:"jwt"`
}
type Redis struct {
    Addr string `json:"addr"`
}

type Config struct {
    *ImCloud `json:"im-cloud"`
    ImServerS map[string]*ImServer `json:"im-server-s"`
    *Keys `json:"keys"`
    *Redis `json:"redis"`
}
var Cfg *Config = new(Config)

func init() {
    path := "D:\\go\\config\\imstar.json"
    file,_ := os.Open(path)
    d,_ := ioutil.ReadAll(file)
    // 放到cfg中
    err := json.Unmarshal(d, Cfg)
    fmt.Println(Cfg.ImServerS["im-server-9000"].Addr)
    if err != nil {
        fmt.Println(string(d))
        fmt.Println(Cfg)
        fmt.Println("===>>> imstart config set err : ",err)
    }
}

单元测试
config_test.go

package config

import (
    "fmt"
    "testing"
)
func TestConfig(t *testing.T) {
    fmt.Println(Cfg.ImCloud, Cfg.Redis)
    fmt.Println(Cfg.Keys)
    for name, ims := range Cfg.ImServerS {
        fmt.Println(name, " ===>> ", ims)
    }
}