yaml 檔案是目前最常用的配置檔案，使用go語言編寫程式碼和工具時，也會用到yaml檔案，將服務配置及中介軟體等資訊定義到yaml檔案中，後續可根據實際場景來選用。

//先下載外部包
go get -u gopkg.in/yaml.v2

1、定義yaml配置檔案

conf/test.yaml

ck:
  host: 11.11.11.11
  port: 9001
  database: db2
  username: test2
  password: 123ck456
user: test
password: 123yy456
host: 10.10.10.10
port: 3306
dbname: db1
 

2、主程式

package main

import (
    "fmt"
    "gopkg.in/yaml.v3"
    "io/ioutil"
)

type Conn struct {
    Ck struct {
        Host     string `yaml:"host"`
        Port     string `yaml:"port"`
        Database string `yaml:"database"`
        Username string `yaml:"username"`
        Password string
 
 `yaml:"password"`
    }
}
type Mysql struct {
    User     string `yaml:"user"`
    Password string `yaml:"password"`
    Host     string `yaml:"host"`
    Port     string `yaml:"port"`
    DBname   string `yaml:"dbname"`
}

const cfgFile = "conf/test.yaml"

func main() {
    data, err := ioutil.ReadFile(cfgFile)　　//讀取配置檔案的路徑
    
 
if err != nil {
        fmt.Printf("err: %v\n", err)
        return
    }

    var conf Conn
    if err := yaml.Unmarshal(data, &conf); err != nil {　　//將yaml檔案中的資訊反序列化給conf結構體
        fmt.Printf("err: %v\n", err)
        return
    }
    yml, _ := yaml.Marshal(conf)　　//序列化為yaml檔案
    fmt.Printf("conf: %#v\n", conf)
    fmt.Printf("%s\n", yml)

    var confs Mysql
    if err := yaml.Unmarshal(data, &confs); err != nil {
        fmt.Printf("err: %v\n", err)
        return
    }
    yaml, _ := yaml.Marshal(confs)
    fmt.Printf("conf: %#v\n", confs)
    fmt.Printf("%s\n", yaml)
}

3、輸出結果

conf: main.Conn{Ck:struct { Host string "yaml:\"host\""; Port string "yaml:\"por
t\""; Database string "yaml:\"database\""; Username string "yaml:\"username\"";
Password string "yaml:\"password\"" }{Host:"11.11.11.11", Port:"9001", Database:
"db2", Username:"test2", Password:"123ck456"}}
ck:
    host: 11.11.11.11
    port: "9001"
    database: db2
    username: test2
    password: 123ck456

conf: main.Mysql{User:"test", Password:"123yy456", Host:"10.10.10.10", Port:"330
6", DBname:"db1"}
user: test
password: 123yy456
host: 10.10.10.10
port: "3306"
dbname: db1

將yaml檔案中的資訊反序列化給Config結構體