Golang文件复制方法全解析

func copyFile(src, dst string) error {
    source, err := os.Open(src)
    if err != nil {
        return err
    }
    defer source.Close()

    destination, err := os.Create(dst)
    if err != nil {
        return err
    }
    defer destination.Close()

    _, err = io.Copy(destination, source)
    return err
}

func copyFileWithBuffer(src, dst string) error {
    buffer := make([]byte, 1024*1024) // 1MB 缓冲

    source, err := os.Open(src)
    if err != nil {
        return err
    }
    defer source.Close()

    destination, err := os.Create(dst)
    if err != nil {
        return err
    }
    defer destination.Close()

    for {
        n, err := source.Read(buffer)
        if err == io.EOF {
            break
        }
        if err != nil {
            return err
        }

        _, err = destination.Write(buffer[:n])
        if err != nil {
            return err
        }
    }
    return nil
}

func copyFileWithMode(src, dst string) error {
    info, err := os.Stat(src)
    if err != nil {
        return err
    }

    err = copyFile(src, dst) // 使用前面定义的拷贝函数
    if err != nil {
        return err
    }

    return os.Chmod(dst, info.Mode())
}