转载：http://www.3fwork.com/b208/000119MYM031848/

golang tar gzip压缩，解压（含目录文件） tar是用于文件归档，gzip用于压缩。仅仅用tar的话，达不到压缩的目的。我们常见的tar.gz就是用gzip压缩生成的tar归档文件。

go实现tar压缩与解压与zip类似，区别在于tar需要使用gzip进行处理。tar与zip的Header不同。代码如下

package tartest

import (
	"archive/tar"
	"compress/gzip"
	"io"
	"os"
	"strings"
)

//压缩 使用gzip压缩成tar.gz
func Compress(files []*os.File,dest string) error {
	d,_ := os.Create(dest)
	defer d.Close()
	gw := gzip.NewWriter(d)
	defer gw.Close()
	tw := tar.NewWriter(gw)
	defer tw.Close()
	for _,file := range files {
		err := compress(file,"",tw)
		if err != nil {
			return err
		}
	}
	return nil
}

func compress(file *os.File,prefix string,tw *tar.Writer) error {
	info,err := file.Stat()
	if err != nil {
		return err
	}
	if info.IsDir() {
		prefix = prefix + "/" + info.Name()
		fileInfos,err := file.Readdir(-1)
		if err != nil {
			return err
		}
		for _,fi := range fileInfos {
			f,err := os.Open(file.Name() + "/" + fi.Name())
			if err != nil {
				return err
			}
			err = compress(f,prefix,tw)
			if err != nil {
				return err
			}
		}
	} else {
		header,err := tar.FileInfoHeader(info,"")
		header.Name = prefix + "/" + header.Name
		if err != nil {
			return err
		}
		err = tw.WriteHeader(header)
		if err != nil {
			return err
		}
		_,err = io.Copy(tw,file)
		file.Close()
		if err != nil {
			return err
		}
	}
	return nil
}

//解压 tar.gz
func DeCompress(tarFile,dest string) error {
	srcFile,err := os.Open(tarFile)
	if err != nil {
		return err
	}
	defer srcFile.Close()
	gr,err := gzip.NewReader(srcFile)
	if err != nil {
		return err
	}
	defer gr.Close()
	tr := tar.NewReader(gr)
	for {
		hdr,err := tr.Next()
		if err != nil {
			if err == io.EOF {
				break
			} else {
				return err
			}
		}
		filename := dest + hdr.Name
		file,err := createFile(filename)
		if err != nil {
			return err
		}
		io.Copy(file,tr)
	}
	return nil
}

func createFile(name string) (*os.File,error) {
	err := os.MkdirAll(string([]rune(name)[0:strings.LastIndex(name,"/")]),0755)
	if err != nil {
		return nil,err
	}
	return os.Create(name)
}