golang创建文件目录os.Mkdir,os.MkdirAll的区别说明

 os.Mkdir("abc", os.ModePerm)  //创建目录 
 os.MkdirAll("dir1/dir2/dir3", os.ModePerm) //创建多级目录 

err:=os.Mkdir（“dir1/dir2/dir3”，os.ModePerm)
if err!=nil{
 fmt.Println(err) 
}
result:mkdir ./dir1/dir2/dir3: The system cannot find the path specified.

err:=os.Mkdir("./dir1",os.ModePerm)
if err!=nil{
 fmt.Println(err)
}

mkdir ./dir1: Cannot create a file when that file already exists.

import (
 "os"
 "path/filepath"
 "time"
)
// CreateDateDir 根据当前日期来创建文件夹
func CreateDateDir(Path string) string {
 folderName := time.Now().Format("20060102")
 folderPath := filepath.Join(Path, folderName)
 if _, err := os.Stat(folderPath); os.IsNotExist(err) {
 // 必须分成两步：先创建文件夹、再修改权限
 os.Mkdir(folderPath, 0777) //0777也可以os.ModePerm
 os.Chmod(folderPath, 0777)
 }
 return folderPath
}

err=os.MkdirAll("./dir1/dir2",os.ModePerm)
if err!=nil{
 fmt.Println(err)
 }
err为nil
成功创建dir1/dir2文件路径

uploadDir := "static/upload/" + time.Now().Format("2006/01/02/")
err := os.MkdirAll( uploadDir , 777)

os.Getwd() //获取当前目录

f1, _ := os.Create("./1.txt") 
defer f1.Close()

f4, _ := os.OpenFile("./4.txt", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0666)
defer f4.Close()

os.path.join("D:\","test.txt") \\结果是D:\test.txt

os.Remove("abc/d/e/f")

os.RemoveAll("abc")

os.Rename("./2.txt", "./2_new.txt")

// create file with dir if dir is not exist
// path is dir
// name is file name
func createFileWithDir(path string, name string, content string) {
 os.MkdirAll(path, os.ModePerm)
 file, _ := os.OpenFile(path + "/" + name, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0666)
 defer file.Close()
 file.WriteString(content)
}