Golang如何实现命令行参数解析_Golang CLI参数处理与解析实践

package main

import (
    "flag"
    "fmt"
)

func main() {
    // 定义参数
    name := flag.String("name", "World", "姓名")
    age := flag.Int("age", 0, "年龄")
    verbose := flag.Bool("v", false, "是否开启详细输出")

    // 解析参数
    flag.Parse()

    // 使用参数
    fmt.Printf("Hello %s, you are %d years old\n", *name, *age)
    if *verbose {
        fmt.Println("Verbose mode enabled")
    }
}

Hello Alice, you are 25 years old<br>Verbose mode enabled

package main

import (
    "flag"
    "os"
    "fmt"
)

func main() {
    // 创建子命令解析器
    addCmd := flag.NewFlagSet("add", flag.ExitOnError)
    deleteCmd := flag.NewFlagSet("delete", flag.ExitOnError)

    // add 子命令参数
    addName := addCmd.String("name", "", "用户名")

    // delete 子命令参数
    force := deleteCmd.Bool("force", false, "强制删除")

    if len(os.Args) < 2 {
        fmt.Println("expected 'add' or 'delete' subcommand")
        os.Exit(1)
    }

    switch os.Args[1] {
    case "add":
        addCmd.Parse(os.Args[2:])
        fmt.Printf("Adding user: %s\n", *addName)
    case "delete":
        deleteCmd.Parse(os.Args[2:])
        fmt.Printf("Deleting with force=%v\n", *force)
    default:
        fmt.Println("unknown subcommand")
    }
}

flag.Usage = func() {
    fmt.Println("Usage: myapp [options]")
    fmt.Println("Options:")
    fmt.Println("  -name string    姓名 (默认: World)")
    fmt.Println("  -age int        年龄")
    fmt.Println("  -v              开启详细模式")
}

if *name == "" {
    fmt.Fprintln(os.Stderr, "错误：-name 是必填项")
    flag.Usage()
    os.Exit(1)
}