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filetil.go
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filetil.go
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package filetil
import (
"os"
"path/filepath"
"strings"
"io"
"fmt"
"math"
"io/ioutil"
"bytes"
)
//==================================
//更多文件和目录的操作,使用filepath包和os包
//==================================
//返回的目录扫描结果
type FileList struct {
IsDir bool //是否是目录
Path string //文件路径
Ext string //文件扩展名
Name string //文件名
Size int64 //文件大小
ModTime int64 //文件修改时间戳
}
//目录扫描
//@param dir 需要扫描的目录
//@return fl 文件列表
//@return err 错误
func ScanFiles(dir string) (fl []FileList, err error) {
err = filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
if err == nil {
path = strings.Replace(path, "\\", "/", -1) //文件路径处理
fl = append(fl, FileList{
IsDir: info.IsDir(),
Path: path,
Ext: strings.ToLower(filepath.Ext(path)),
Name: info.Name(),
Size: info.Size(),
ModTime: info.ModTime().Unix(),
})
}
return err
})
return
}
//拷贝文件
func CopyFile(source string, dst string) (err error) {
sourceFile, err := os.Open(source)
if err != nil {
return err
}
defer sourceFile.Close()
_,err = os.Stat(filepath.Dir(dst))
if err != nil {
if os.IsNotExist(err) {
os.MkdirAll(filepath.Dir(dst),0766)
}else{
return err
}
}
destFile, err := os.Create(dst)
if err != nil {
return err
}
defer destFile.Close()
_, err = io.Copy(destFile, sourceFile)
if err == nil {
sourceInfo, err := os.Stat(source)
if err != nil {
err = os.Chmod(dst, sourceInfo.Mode())
}
}
return
}
//拷贝目录
func CopyDir(source string, dest string) (err error) {
// get properties of source dir
sourceInfo, err := os.Stat(source)
if err != nil {
return err
}
// create dest dir
err = os.MkdirAll(dest, sourceInfo.Mode())
if err != nil {
return err
}
directory, _ := os.Open(source)
objects, err := directory.Readdir(-1)
for _, obj := range objects {
sourceFilePointer := filepath.Join(source , obj.Name())
destinationFilePointer := filepath.Join(dest, obj.Name())
if obj.IsDir() {
// create sub-directories - recursively
err = CopyDir(sourceFilePointer, destinationFilePointer)
if err != nil {
fmt.Println(err)
}
} else {
// perform copy
err = CopyFile(sourceFilePointer, destinationFilePointer)
if err != nil {
fmt.Println(err)
}
}
}
return
}
func RemoveDir(dir string) error {
return os.RemoveAll(dir)
}
func AbsolutePath(p string) (string, error) {
if strings.HasPrefix(p, "~") {
home := os.Getenv("HOME")
if home == "" {
panic(fmt.Sprintf("can not found HOME in envs, '%s' AbsPh Failed!", p))
}
p = fmt.Sprint(home, string(p[1:]))
}
s, err := filepath.Abs(p)
if nil != err {
return "", err
}
return s, nil
}
// FileExists reports whether the named file or directory exists.
func FileExists(path string) bool {
_, err := os.Stat(path)
if err == nil {
return true
}
if os.IsNotExist(err) {
return false
}
return false
}
func FormatBytes(size int64) string {
units := []string{" B", " KB", " MB", " GB", " TB"}
s := float64(size)
i := 0
for ; s >= 1024 && i < 4; i++ {
s /= 1024
}
return fmt.Sprintf("%.2f%s", s, units[i])
}
func Round(val float64, places int) float64 {
var t float64
f := math.Pow10(places)
x := val * f
if math.IsInf(x, 0) || math.IsNaN(x) {
return val
}
if x >= 0.0 {
t = math.Ceil(x)
if (t - x) > 0.50000000001 {
t -= 1.0
}
} else {
t = math.Ceil(-x)
if (t + x) > 0.50000000001 {
t -= 1.0
}
t = -t
}
x = t / f
if !math.IsInf(x, 0) {
return x
}
return t
}
//判断指定目录下是否存在指定后缀的文件
func HasFileOfExt(path string,exts []string) bool {
err := filepath.Walk(path, func(path string, info os.FileInfo, err error) error {
if !info.IsDir() {
ext := filepath.Ext(info.Name())
for _,item := range exts {
if strings.EqualFold(ext,item) {
return os.ErrExist
}
}
}
return nil
})
return err == os.ErrExist
}
//忽略字符串中的BOM头
func ReadFileAndIgnoreUTF8BOM(filename string) ([]byte,error) {
data,err := ioutil.ReadFile(filename)
if err != nil {
return nil,err
}
if data == nil {
return nil,nil
}
data = bytes.Replace(data,[]byte("\r"),[]byte(""),-1)
if len(data) >= 3 && data[0] == 0xef && data[1] == 0xbb && data[2] == 0xbf {
return data[3:],err
}
return data,nil
}