//读取一行

func myReadLine(paths string) error {

    //先获取到文件信息

    fileinfo, err := os.Stat(paths)

    if err != nil {

        return fmt.Errorf("get file info error")

    }

    //判断是否是目录

    if fileinfo.IsDir() {

        return fmt.Errorf("paths is dir")

    }

    f, err := os.Open(paths)

    rd := bufio.NewReader(f)

    for {

        //跟ReadString功能相似，不过是返回的字节切片

        /*

            lineBytes, err := rd.ReadBytes('\n')

            line := string(lineBytes)

        */

        line, err := rd.ReadString('\n')

            }

            lineBytes, err := rd.ReadBytes('\n')

            line := string(lineBytes)

        */

        line, err := rd.ReadString('\n')

        line = strings.Trim(line, "\n")

        fmt.Printf("%s\n", line)

        if err != nil || err == io.EOF {

            if err != nil {

                return fmt.Errorf("ReadString error")

            }

            break

        }

    }

    return nil

}