go 文件和文件夹操作

package dird

import (
    "encoding/base64"
    "fmt"
    "io"
    "io/ioutil"
    "os"
    "path/filepath"
    "strconv"
    "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)
    res, b := PathExists(folderPath)
    if res {
        for i := 1; true; i++ {

            res, b := PathExists(folderPath + "_" + strconv.Itoa(i))
            if !res {
                if b != nil {
                    fmt.Println(b)
                    os.Exit(1)
                } else {
                    folderPath = folderPath + "_" + strconv.Itoa(i)
                    break
                }

            }

        }
    } else {
        if b != nil {
            fmt.Println(b)
            os.Exit(1)
        }
    }

    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)
        g := filepath.Join(folderPath, "更新内容")
        b := filepath.Join(folderPath, "备份内容")
        os.Mkdir(g, 0777) //0777也可以os.ModePerm
        os.Chmod(g, 0777)
        os.Mkdir(b, 0777) //0777也可以os.ModePerm
        os.Chmod(b, 0777)
    }
    return folderPath
}

// PathExists 判断文件夹是否存在
func PathExists(path string) (bool, error) {
    _, err := os.Stat(path)
    if err == nil {
        return true, nil
    }
    if os.IsNotExist(err) {
        return false, nil
    }
    return false, err
}

//CopyFile fuzhi
func CopyFile(dstFileName string, srcFileName string) (written int64, err error) {

    srcFile, err := os.Open(srcFileName)

    if err != nil {
        fmt.Printf("open file err = %v\n", err)
        return
    }

    defer srcFile.Close()

    //打开dstFileName

    dstFile, err := os.OpenFile(dstFileName, os.O_WRONLY|os.O_CREATE, 0755)
    if err != nil {
        fmt.Printf("open file err = %v\n", err)
        return
    }

    defer dstFile.Close()

    return io.Copy(dstFile, srcFile)

}

//Base64ToFile 232
func Base64ToFile(dd string, oo string) {
    ddd, _ := base64.StdEncoding.DecodeString(dd) //成图片文件并把文件写入到buffer
    ioutil.WriteFile(oo, ddd, 0666)               //buffer输出到jpg文件中（不做处理，直接写到文件）
}

// Img2Base64 123
func Img2Base64() {
    ff, _ := ioutil.ReadFile("D:\\study\\右键菜单\\mytools.ico")  //我还是喜欢用这个快速读文件
    bufstore := make([]byte, 13000)                           //数据缓存
    base64.StdEncoding.Encode(bufstore, ff)                   // 文件转base64
    _ = ioutil.WriteFile("./output2.jpg.txt", bufstore, 0666) //直接写入到文件就ok完活了。
}

// WriteToFile 123
func WriteToFile(files string, msg string) {
    if err := ioutil.WriteFile(files, []byte(msg), 777); err != nil {
        os.Exit(111)

    }
}