如何使用Golang修改YAML文件的内容

go get gopkg.in/yaml.v2

app:
  name: MyApp
  version: 1.0
  author:
    name: John Doe
    email: john@doe.com
database:
  url: localhost:3306
  username: root
  password: secret

package main

import (
    "fmt"
    "io/ioutil"

    "gopkg.in/yaml.v2"
)

type Config struct {
    App      App      `yaml:"app"`
    Database Database `yaml:"database"`
}

type App struct {
    Name    string `yaml:"name"`
    Version string `yaml:"version"`
    Author  Author `yaml:"author"`
}

type Author struct {
    Name  string `yaml:"name"`
    Email string `yaml:"email"`
}

type Database struct {
    URL      string `yaml:"url"`
    Username string `yaml:"username"`
    Password string `yaml:"password"`
}

func main() {
    configFile, err := ioutil.ReadFile("config.yaml")
    if err != nil {
        panic(err)
    }

    var config Config
    if err := yaml.Unmarshal(configFile, &config); err != nil {
        panic(err)
    }

    config.App.Version = "2.0"
    config.App.Author.Email = "jane@doe.com"

    output, err := yaml.Marshal(config)
    if err != nil {
        panic(err)
    }

    if err := ioutil.WriteFile("config.yaml", output, 0644); err != nil {
        panic(err)
    }

    fmt.Println("Config file has been updated.")
}

Config file has been updated.