Learn the file operation functions in Go language and implement the file compression and upload function

Learn the file operation functions in the Go language and implement the file compression and upload function

In the Go language, the file operation function is one of the most commonly used functions. Through file operation functions, we can read, write, copy, delete and other operations on files. At the same time, in practical applications, we often encounter the need to compress and upload files. This article will introduce the file operation functions in the Go language and implement the file compression upload function through code examples.

1. File operation function

1. Create file
In Go language, we can use the OpenFile function to create a new file. The code example is as follows:

func CreateFile(filename string) {
    file, err := os.OpenFile(filename, os.O_CREATE|os.O_WRONLY, 0666)
    if err != nil {
        fmt.Println("创建文件失败：", err)
        return
    }
    defer file.Close()
    fmt.Println("文件创建成功！")
}

2. Read file content
Go language provides a variety of functions for reading file content, such as Read, ReadAll, and ReadLine. The code example is as follows:

func ReadFile(filename string) {
    file, err := os.Open(filename)
    if err != nil {
        fmt.Println("打开文件失败：", err)
        return
    }
    defer file.Close()
    
    buf := make([]byte, 1024)
    for {
        n, err := file.Read(buf)
        if err != nil && err != io.EOF {
            fmt.Println("读取文件失败：", err)
            break
        }
        if n == 0 {
            break
        }
        fmt.Println(string(buf[:n]))
    }
}

3. Write file content
In Go language, we can use the Write function to write the content to a file. The code example is as follows:

func WriteFile(filename string, content string) {
    file, err := os.OpenFile(filename, os.O_WRONLY|os.O_TRUNC|os.O_CREATE, 0666)
    if err != nil {
        fmt.Println("打开文件失败：", err)
        return
    }
    defer file.Close()
    
    _, err = file.Write([]byte(content))
    if err != nil {
        fmt.Println("写入文件失败：", err)
        return
    }
    fmt.Println("文件写入成功！")
}

4. File copy
You can use io.Copy to copy one file to another file. The code example is as follows:

func CopyFile(srcFile, destFile string) {
    src, err := os.Open(srcFile)
    if err != nil {
        fmt.Println("打开源文件失败：", err)
        return
    }
    defer src.Close()
    
    dest, err := os.OpenFile(destFile, os.O_WRONLY|os.O_CREATE, 0666)
    if err != nil {
        fmt.Println("打开目标文件失败：", err)
        return
    }
    defer dest.Close()
    
    _, err = io.Copy(dest, src)
    if err != nil {
        fmt.Println("复制文件失败：", err)
        return
    }
    fmt.Println("文件复制成功！")
}

2. Implementation of file compression upload function

In Go language, we can use the archive/zip package to compress files. At the same time, the compressed file can be uploaded using the HTTP library. The code example is as follows:

func CompressAndUpload(filename string) {
    zipPath := filename + ".zip"
    err := compressFile(filename, zipPath)
    if err != nil {
        fmt.Println("压缩文件失败：", err)
        return
    }
    
    err = uploadFile(zipPath)
    if err != nil {
        fmt.Println("上传文件失败：", err)
        return
    }
}

func compressFile(filename, zipPath string) error {
    zipFile, err := os.Create(zipPath)
    if err != nil {
        return err
    }
    defer zipFile.Close()
    
    zipWriter := zip.NewWriter(zipFile)
    defer zipWriter.Close()
    
    file, err := os.Open(filename)
    if err != nil {
        return err
    }
    defer file.Close()
    
    fileInfo, err := file.Stat()
    if err != nil {
        return err
    }
    
    header, err := zip.FileInfoHeader(fileInfo)
    if err != nil {
        return err
    }
    
    writer, err := zipWriter.CreateHeader(header)
    if err != nil {
        return err
    }
    
    _, err = io.Copy(writer, file)
    return err
}

func uploadFile(filename string) error {
    file, err := os.Open(filename)
    if err != nil {
        return err
    }
    defer file.Close()
    
    resp, err := http.Post("http://upload.example.com", "application/zip", file)
    if err != nil {
        return err
    }
    defer resp.Body.Close()
    
    return nil
}

The above code example implements the function of compressing the specified file and uploading the compressed file to the specified server through the HTTP library.

Summary:

This article introduces the commonly used file operation functions in the Go language, and demonstrates the file compression upload function through code examples. For beginners of Go language, it is very important to master the file operation functions, which can help us better process and manage files. For the compressed upload requirements of files in actual development, we can achieve it by combining the archive/zip package and the HTTP library. I hope this article will be helpful to your study and practice.

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