golang压缩与解压缩文件
全代码实现,如有帮助,欢迎留下足迹。
目录
压缩
核心处理
解压缩
压缩
入口压缩函数
useBasePathInZip参数:
为 false 相当于全文件视图,zip中没有目录
为 true表示保留源文件的路径(srcPaths如果是相对路径,则压缩后zip文件中也是相对路径)
func compress(srcPaths []string, outputPath string, useBasePathInZip bool) {
if len(srcPaths) == 0 {
return
}
file, openErr := os.OpenFile(outputPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if openErr != nil {
fmt.Printf("failed to open file %s: %v\n", outputPath, openErr)
return
}
defer file.Close()
zipWriter := zip.NewWriter(file)
defer zipWriter.Close()
for _, path := range srcPaths {
info, err := os.Stat(path)
if err != nil {
fmt.Printf("failed to stat file %s: %v\n", path, err)
return
}
if info.IsDir() {
fmt.Printf("%s is dir...\n", path)
err = addFilesToDirectory(zipWriter, path, "", useBasePathInZip)
if err != nil {
return
}
continue
}
fmt.Printf("%s is file...\n", path)
if err = compressFile(zipWriter, path, useBasePathInZip); err != nil {
log.Fatalf("add file %s to zip failed: %s", path, err)
}
}
}
核心处理
递归压缩目录中的所有文件
func addFilesToDirectory(zw *zip.Writer, newDir, baseInZip string, useBasePathInZip bool) error {
files, err := ioutil.ReadDir(newDir)
if err != nil {
return err
}
fmt.Printf("目录 %s 下包含 %d 个对象.\n", newDir, len(files))
var newBaseInZip string
for _, fileInfo := range files {
if useBasePathInZip {
newBaseInZip = filepath.Join(baseInZip, fileInfo.Name())
}
newFullPath := filepath.Join(newDir, fileInfo.Name())
fmt.Printf("\tcheck filename=%s, newFullPath=%s, newBaseInZip=%s \n", fileInfo.Name(), newFullPath, newBaseInZip)
// 是目录,递归处理
if fileInfo.IsDir() {
if err = addFilesToDirectory(zw, newFullPath, newBaseInZip, useBasePathInZip); err != nil {
return err
}
continue
}
// 处理单个文件
if err = compressFile(zw, newFullPath, useBasePathInZip); err != nil {
return err
}
}
return nil
}
压缩单个文件
func compressFile(zw *zip.Writer, srcFile string, useBasePathInZip bool) error {
fileToZip, err := os.Open(srcFile)
if err != nil {
log.Fatalf("compressFile failed to open %s: %v", srcFile, err)
return err
}
defer fileToZip.Close()
var zipFile io.Writer
if !useBasePathInZip {
// 获得源文件FileInfo对象
info, err := fileToZip.Stat()
if err != nil {
fmt.Printf("failed to open file %s: %v\n", srcFile, err)
return err
}
// 创建新的ZIP文件头,并设置其内部路径仅为文件名
header, err := zip.FileInfoHeader(info)
if err != nil {
fmt.Printf("failed to create file header for %s: %v\n", srcFile, err)
return err
}
fmt.Println("名称=", header.Name)
// 设置压缩后的文件名为源文件名(去掉路径)
header.Name = filepath.Base(srcFile)
// 基于主zw流创建该文件的目标zip平台
zipFile, err = zw.CreateHeader(header)
if err != nil {
return err
}
} else {
zipFile, err = zw.Create(srcFile)
if err != nil {
return err
}
}
// 将源文件Copy到目标zip平台
_, err = io.Copy(zipFile, fileToZip)
fmt.Printf("压缩 %s 完成 %v\n", srcFile, err)
return err
}
调用压缩
func main() {
var srcPaths = []string{"fzip/zipt/a.txt", "fzip/unzip.go"}
compress(srcPaths, "./a.zip", true)
}
解压缩
func unzip(unzipFile, unzipDir string) {
zipReader, _ := zip.OpenReader(unzipFile)
for i, file := range zipReader.Reader.File {
fmt.Printf("正在压缩第 %d 个. name=%s Comment=%s, isDir=%v, size=%d.\n", i+1, file.Name, file.Comment, file.FileInfo().IsDir(), file.FileInfo().Size())
func(i int, file *zip.File) {
zippedFile, err := file.Open()
if err != nil {
log.Fatal(err)
}
defer zippedFile.Close()
extractedFilePath := filepath.Join(unzipDir, file.Name)
if file.FileInfo().IsDir() {
_ = os.MkdirAll(extractedFilePath, file.Mode()) // 权限不变
fmt.Println("dir Created:", extractedFilePath)
return
}
fmt.Println("file extracted: ", file.Name)
func() {
outputFile, err := os.OpenFile(extractedFilePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, file.Mode())
if err != nil {
log.Fatal(err)
}
defer outputFile.Close()
_, err = io.Copy(outputFile, zippedFile)
if err != nil {
log.Fatal(err)
}
}()
}(i, file)
}
}