使用gopkg.in/yaml.v3 解析YAML数据详解

go get gopkg.in/yaml.v3

server:
  port: 8080
  host: localhost
database:
  host: db.example.com
  port: 5432
  username: user
  password: secret

package main
import (
    "fmt"
    "gopkg.in/yaml.v3"
    "os"
)
type Config struct {
    Server   ServerConfig   `yaml:"server"`
    Database DatabaseConfig `yaml:"database"`
}
type ServerConfig struct {
    Port int    `yaml:"port"`
    Host string `yaml:"host"`
}
type DatabaseConfig struct {
    Host     string `yaml:"host"`
    Port     int    `yaml:"port"`
    Username string `yaml:"username"`
    Password string `yaml:"password"`
}
func main() {
    // 打开 YAML 文件
    file, err := os.Open("config.yaml")
    if err != nil {
        fmt.Println("Error opening file:", err)
        return
    }
    defer file.Close()
    // 创建解析器
    decoder := yaml.NewDecoder(file)
    // 配置对象
    var config Config
    // 解析 YAML 数据
    err = decoder.Decode(&config)
    if err != nil {
        fmt.Println("Error decoding YAML:", err)
        return
    }
    // 输出配置项
    fmt.Printf("Server Port: %d\n", config.Server.Port)
    fmt.Printf("Server Host: %s\n", config.Server.Host)
    fmt.Printf("Database Host: %s\n", config.Database.Host)
    fmt.Printf("Database Port: %d\n", config.Database.Port)
    fmt.Printf("Database Username: %s\n", config.Database.Username)
    fmt.Printf("Database Password: %s\n", config.Database.Password)
}

package main
import (
	"fmt"
	"gopkg.in/yaml.v3"
	"os"
)
type Config struct {
	Server   ServerConfig   `yaml:"server"`
	Database DatabaseConfig `yaml:"database"`
}
type ServerConfig struct {
	Port int    `yaml:"port"`
	Host string `yaml:"host"`
}
type DatabaseConfig struct {
	Host     string `yaml:"host"`
	Port     int    `yaml:"port"`
	Username string `yaml:"username"`
	Password string `yaml:"password"`
}
func main() {
	config := Config{
		Server: ServerConfig{
			Port: 8080,
			Host: "localhost",
		},
		Database: DatabaseConfig{
			Host:     "db.example.com",
			Port:     5432,
			Username: "user",
			Password: "secret",
		},
	}
	// 创建文件
	file, err := os.Create("output.yaml")
	if err != nil {
		fmt.Println("Error creating file:", err)
		return
	}
	defer file.Close()
	// 创建编码器
	encoder := yaml.NewEncoder(file)
	// 将配置编码为 YAML 数据
	err = encoder.Encode(&config)
	if err != nil {
		fmt.Println("Error encoding YAML:", err)
		return
	}
	fmt.Println("YAML data saved to output.yaml")
}