如何用Golang的os库操作系统文件 目录遍历与文件信息获取

os.File

os.ReadDir

os.Stat

os.ReadDir

[]fs.DirEntry

package main

import (
    "fmt"
    "log"
    "os"
)

func main() {
    dir := "."
    entries, err := os.ReadDir(dir)
    if err != nil {
        log.Fatal(err)
    }

    for _, entry := range entries {
        fmt.Println("Name:", entry.Name(), "IsDir:", entry.IsDir())
    }
}

os.Stat

os.FileInfo

info, err := os.Stat("main.go")
if err != nil {
    log.Fatal(err)
}
fmt.Println("Size:", info.Size(), "bytes")
fmt.Println("ModTime:", info.ModTime())
fmt.Println("IsDir:", info.IsDir())
fmt.Printf("Mode: %v\n", info.Mode())

func walkDir(path string) error {
    entries, err := os.ReadDir(path)
    if err != nil {
        return err
    }

    for _, entry := range entries {
        fullPath := path + "/" + entry.Name()
        info, _ := entry.Info() // 获取 FileInfo

        fmt.Printf("Path: %s, Size: %d, IsDir: %v\n", 
            fullPath, info.Size(), entry.IsDir())

        if entry.IsDir() {
            walkDir(fullPath) // 递归进入子目录
        }
    }
    return nil
}

walkDir("./")

os.Stat

if _, err := os.Stat("config.yaml"); os.IsNotExist(err) {
    fmt.Println("文件不存在")
} else {
    fmt.Println("文件存在")
}

os.Stat

os.IsNotExist(err)