GolangReadFilelinebyline

https://segmentfault.com/a/

学习什么语言都得从读文件开始，好像记得一个大神说过计算机编程就是”打开文件，操作，关闭文件”。初学Golang就记一下go语言的文件操作

Read File

func main(){ rw,err := os.Open("") if err != nil { panic(err) } defer rw.Close() rb := bufio.NewReader(rw) for { line, _, err := rb.ReadLine() if err == io.EOF { break } //do something fmt.Println(string(line)) } }
func main(){ rw,err := os.Open("") if err != nil { panic(err) } defer rw.Close() sb := bufio.NewScanner(rw) for sb.Scan() { //do something fmt.Println(sb.Text()) } if err := sb.Err(); err !=nil { panic(err) } }
Write File
func main(){ fw,err := os.OpenFile("",os.O_WRONLY|os.O_CREATE|os.O_APPEND,0644) if err != nil { panic(err) } defer fw.Close() wb := bufio.NewWriter(fw) wb.WriteString("hello world\n") wb.Flush() }
Read Dir
func main(){ fw,err := os.OpenFile("",os.O_WRONLY|os.O_CREATE|os.O_APPEND,0644) if err != nil { panic(err) } defer fw.Close() fileinfos, err := fw.Readdir(0) if err != nil { panic(err) } for _, fileinfo := range fileinfos { //do something fmt.Println(fileinfo.Name(), fileinfo.Size()) } }