配置文件大揭秘：INI文件读写实战详解

//  示例INI文件[database]host = localhostport = 3306username = userpassword = secret
[app]name = MyAppversion = 1.0

package main
import (  "fmt"  "gopkg.in/ini.v1")
func main() {  // 加载INI配置文件  cfg, err := ini.Load("config.ini")  if err != nil {    fmt.Printf("Failed to load configuration: %v\n", err)    return  }  defer cfg.Close()}

// 获取数据库配置dbSection := cfg.Section("database")

// 读取数据库主机dbHost := dbSection.Key("host").String()fmt.Printf("Database Host: %s\n", dbHost)

//  读取数据库端口dbPort, err := dbSection.Key("port").Int()if err != nil {  fmt.Printf("Error reading database port: %v\n", err)  return}fmt.Printf("Database Port: %d\n", dbPort)

cfg, err := ini.Load("config.ini")if err != nil {  fmt.Printf("Failed to load configuration: %v\n", err)  return}

appName, err := cfg.Section("app").Key("nonexistent_key").String()if err != nil {  fmt.Printf("Error reading app name: %v\n", err)}

invalidPort, err := dbSection.Key("port").Int()
if err != nil {    fmt.Printf("Error reading invalid port: %v\n", err)}

dbSection := cfg.Section("database")dbHost := dbSection.Key("host").String()dbPort, _ := dbSection.Key("port").Int()dbUsername := dbSection.Key("username").String()dbPassword := dbSection.Key("password").String()
// 使用数据库配置...

appSection := cfg.Section("app")appName := appSection.Key("name").String()appVersion := appSection.Key("version").String()
// 使用程序运行参数...

[server]host = localhostport = 8080
[security]enabled = truekey = secret_key

serverSection := cfg.Section("server")securitySection := cfg.Section("security")
serverHost := serverSection.Key("host").String()serverPort, _ := serverSection.Key("port").Int()securityEnabled, _ := securitySection.Key("enabled").Bool()securityKey := securitySection.Key("key").String()
// 使用复杂配置结构...

// 创建或获取数据库配置sectiondbSection := cfg.Section("database")

// 设置数据库密码dbSection.Key("password").SetValue("new_secret")

type DatabaseConfig struct {  Host     string `ini:"db_host"`  Port     int    `ini:"db_port"`  Username string `ini:"db_username"`  Password string `ini:"db_password"`}
var dbConfig DatabaseConfigerr := cfg.Section("database").MapTo(&dbConfig)

parentSection := cfg.Section("parent")childSections := parentSection.ChildSections()for _, childSection := range childSections {  fmt.Printf("Child Section: %s\n", childSection.Name())}

keys := dbSection.Keys()for _, key := range keys {  fmt.Printf("Key: %s, Value: %s\n", key.Name(), key.String())}

import "flag"
var configFile string
func init() {  flag.StringVar(&configFile, "config", "config.ini", "Path to the configuration file")  flag.Parse()}
func main() {  // 加载INI配置文件  cfg, err := ini.Load(configFile
)  if err != nil {    fmt.Printf("Failed to load configuration: %v\n", err)    return  }  defer cfg.Close()
  // 读取其他配置...}

databaseHost := os.Getenv("DB_HOST")
// 如果环境变量未设置，则从INI文件中读取if databaseHost == "" {    databaseHost = cfg.Section("database").Key("host").String()}

// 检测INI文件修改lastModifiedTime := time.Now()
for {    fileInfo, err := os.Stat("config.ini")    if err != nil {       fmt.Printf("Error checking file modification: %v\n", err)       return    }
    if fileInfo.ModTime().After(lastModifiedTime) {        // INI文件已经被修改，执行热更新操作        lastModifiedTime = fileInfo.ModTime()        // 重新加载配置...    }
    time.Sleep(1 * time.Second)}