golang解析yaml檔案操作
阿新 • • 發佈:2020-12-24
首先安裝解析的第三方包:
go get gopkg.in/yaml.v2
示例:
package main import ( "os" "log" "fmt" "encoding/json" "gopkg.in/yaml.v2" ) type Config struct { Test Test `yaml:"test"` } type Test struct { User []string `yaml:"user"` MQTT MQ `yaml:"mqtt"` Http HTTP `yaml:"http"` } type HTTP struct { Port string `yaml:"port"` Host string `yaml:"host"` } type MQ struct { Host string `yaml:"host"` Username string `yaml:"username"` Password string `yaml:"password"` } //read yaml config //注:path為yaml或yml檔案的路徑 func ReadYamlConfig(path string) (*Config,error){ conf := &Config{} if f,err := os.Open(path); err != nil { return nil,err } else { yaml.NewDecoder(f).Decode(conf) } return conf,nil } //test yaml func main() { conf,err := ReadYamlConfig("D:/test_yaml/test.yaml") if err != nil { log.Fatal(err) } byts,err := json.Marshal(conf) if err != nil { log.Fatal(err) } fmt.Println(string(byts)) }
test.yaml內容如下:
test: user: - Tom - Lily - Skay mqtt: host: localhost:1883 username: test password: test http: {port: "8080",host: "127.0.0.1"}
執行結果:
{"Test":{"User":["Tom","Lily","Skay"],"MQTT":{"Host":"localhost:1883","Username":"test","Password":"test"},"Http":{"Port":"8080","Host":"127.0.0.1"}}}
補充:golang 讀取yml格式,多結構體級聯
1.安裝yml解析包
進入到gopath下執行命令
go get gopkg.in/yaml.v2
原始碼地址https://github.com/go-yaml/yaml
2.設定配置檔案config.yml
ipport: 192.168.2.95:10000 startsendtime: 2017-01-02 08:08:08 sendmaxcountperday: 100 devices: - devid: 123456789 nodes: - pkid: 0 bkid: 0 index: 0 minvalue: 0 maxvalue: 60 datatype: normal - pkid: 0 bkid: 0 index: 0 datatype: boolean - devid: 10001 nodes: - pkid: 0 bkid: 1 index: 0 datatype: boolean warnfrequency: 10 sendfrequency: 10
3.編寫測試類
package main import ( "fmt" "gopkg.in/yaml.v2" "io/ioutil" ) //配置檔案中字母要小寫,結構體屬性首字母要大寫 type Myconf struct { Ipport string StartSendTime string SendMaxCountPerDay int Devices []Device WarnFrequency int SendFrequency int } type Device struct { DevId string Nodes []Node } type Node struct { PkId string BkId string Index string MinValue float32 MaxValue float32 DataType string } func main() { data,_ := ioutil.ReadFile("config.yml") fmt.Println(string(data)) t := Myconf{} //把yaml形式的字串解析成struct型別 yaml.Unmarshal(data,&t) fmt.Println("初始資料",t) if(t.Ipport==""){ fmt.Println("配置檔案設定錯誤") return; } d,_ := yaml.Marshal(&t) fmt.Println("看看 :",string(d)) }
4.注意
1.配置檔案中字母要小寫,結構體屬性首字母要大寫,開發比較快
也可以指定如:yaml:"c",只不過有點麻煩,當然如果重新命名必須要指定
2.yaml:",flow"
這個意思是將陣列用[“a”,”b”]這樣的格式展示,預設展示形式是
- a
- b
以上為個人經驗,希望能給大家一個參考,也希望大家多多支援我們。如有錯誤或未考慮完全的地方,望不吝賜教。