go实现按行读取文件(附案例)

• 按行读取文件并筛选打印数据

  func ReadLineFile(fileName string) error {
    if common.IsEmpty(fileName) {
        return errors.New("Read Line File: fileName is nil")
    }
    file, err := os.Open(fileName)
    if err != nil {
        fmt.Println(err)
        return errors.New("Read Line File: Open file error " + err.Error())
    }
    //scan line
    scanner := bufio.NewScanner(file)
    for scanner.Scan() {
        fmt.Println(scanner.Text())
        //other options
        //lineText := scanner.Text()
        //if strings.Index(lineText, "url") >= 0 {
        //  lineTextSplit := strings.Split(lineText, ", url(")
        //  lineTextSplit02 := strings.Split(lineTextSplit[1], ") ")
        //  fmt.Println(lineTextSplit02[0])
        //}
    }
    return nil
  }
  
  

  func main() {
    //按行读取css的信息，然后strings解析出url
    service.ReadLineFile("attachment/css/montserrat.css")
  }