douren6035 2017-03-02 19:22
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在不解压缩到磁盘的情况下读取tar文件的内容

I have been able to loop through the files in a tar file, but I am stuck on how to read the contents of those files as string. I would like to know how to print the contents of the files as a string?

This is my code below

package main

import (
    "archive/tar"
    "fmt"
    "io"
    "log"
    "os"
    "bytes"
    "compress/gzip"
)

func main() {
    file, err := os.Open("testtar.tar.gz")

    archive, err := gzip.NewReader(file)

    if err != nil {
        fmt.Println("There is a problem with os.Open")
    }
    tr := tar.NewReader(archive)

    for {
        hdr, err := tr.Next()
        if err == io.EOF {
            break
        }
        if err != nil {
            log.Fatal(err)
        }

        fmt.Printf("Contents of %s:
", hdr.Name)
    }
}
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2条回答 默认 最新

  • duanhe1965 2017-03-02 19:53
    关注

    Just use the tar.Reader as an io.Reader for each file you want to read.

    tr := tar.NewReader(r)
    
    // get the next file entry 
    h, _ := tr.Next() 
    

    If you need the whole file as a string:

    // read the complete content of the file h.Name into the bs []byte
    bs, _ := ioutil.ReadAll(tr)
    
    // convert the []byte to a string
    s := string(bs)
    

    If you need to read line by line, then this would be better:

    // create a Scanner for reading line by line
    s := bufio.NewScanner(tr)
    
    // line reading loop
    for s.Scan() {
    
      // read the current last read line of text
      l := s.Text()
    
      // ...and do something with l
    
    }
    
    // you should check for error at this point
    if s.Err() != nil {
      // handle it
    }
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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