yaml文件解析：golang篇

本文使用 golang 库 viper 对 yaml 文件进行解析。

下载

go get github.com/spf13/viper

测试

yaml 配置文件

# yaml测试样例
# null 或 NULL 为关键字，不能写

# 名称
# 字符串
name: conf file

# 版本
# 如按浮点，2.0会转换成2
# 如按字符串，保留原样
version: 2.0

# 布尔类，转换为1或0
need: true

# 时间
time: 2020-10-03T09:21:13

empty: nul

# 对象
# 加双引号会转义\n，即会换行
my:
  name: late \n lee
  name1: "late \n lee"
  age: 99
  
# 块
text: |
  hello
  world!

# 数组
fruit:
  - apple
  - apple1
  - apple2
  - apple3
  - apple4
  - apple5

# 多级数组
multi:
  sta:
    - 110 210 ddd 99
    - 133 135 1 2 1588 1509
    - 310-410
    - 333-444

该示例基本涵盖了大部分的 yaml 格式。包括：字符串，数值、数组、多级map。

测试代码

测试代码如下：

package main

import (
    "fmt"
	"os"
	"github.com/spf13/viper"
)

var (
	cfgFile string
)

func main() {
	if cfgFile != "" {
		// Use config file from the flag.
		viper.SetConfigFile(cfgFile)
	} else {
		viper.AddConfigPath("./")
		viper.SetConfigName("config")
		viper.SetConfigType("yaml")
	}

	viper.AutomaticEnv() // read in environment variables that match

	err := viper.ReadInConfig();
	if  err != nil {
		fmt.Println("'config.yaml' file read error:", err)
		os.Exit(0)
	}
    name := viper.GetString("name")
    version := viper.GetString("version")

    need := viper.GetBool("need")
    theTime := viper.GetString("time")
    empty := viper.GetString("empty")
    text := viper.GetString("text")

    fmt.Printf("need: %v name: %v=\n version: %v \ntime: %v \nempty: %s \ntext: %v\n", need, name, version, theTime, empty, text)
    
    name = viper.GetString("my.name")
    name1 := viper.GetString("my.name1")
    age := viper.GetInt("my.age")
    fmt.Printf("name: %v, name1: %v age: %v \n", name, name1, age)

    newSta := viper.GetStringSlice("multi.sta")
    for idx, value := range newSta {
        fmt.Printf("sta[%d]: %v\n", idx, value)
    }

    fruit := viper.GetStringSlice("fruit")

    fmt.Printf("fruit: %v\n", fruit)
    
    bad := viper.GetString("bad")
    bad1 := viper.GetString("my.bad")
    fmt.Printf("bad: %v bad1: %v\n", bad, bad1)
}

go build

$ ./yaml_test.exe
need: true name: conf file=
 version: 2
time: 2020-10-03T09:21:13
empty: nul
text: hello
world!

name: late \n lee, name1: late
 lee age: 99
sta[0]: 110 210 ddd 99
sta[1]: 133 135 1 2 1588 1509
sta[2]: 310-410
sta[3]: 333-444
fruit: [apple apple1 apple2 apple3 apple4 apple5]
bad:  bad1:

结果说明

name: "late \n lee"name: late \n lee