=nil{fmt.Println("Error reading from file:",err)//print error if scanning is not done properly}} Go Copy 输出 line1line2line3 Go Copy 方法2:使用io/ioutil和strings包 此示例使用ioutil.ReadFile函数将文件内容读入内存,以[]bytes格式存储。然后使用字符串转换函数和strings包将内容转换为字符串。使...
os.Stdin, os.Stdout, os.Stderr: console终端标准输出,err os.File: 网络,标准输入输出,文件的流读取 strings.Reader: 把字符串抽象成Reader bytes.Reader: 把[]byte抽象成Reader bytes.Buffer: 把[]byte抽象成Reader和Writer bufio.Reader/Writer: 抽象成带缓冲的流读取(比如按行读写) io库 io 库属于底层...
// Read reads up to len(b) bytes from the File and stores them in b. // It returns the number of bytes read and any error encountered. // At end of file, Read returns 0, io.EOF. func(f *File)Read(b []byte) (nint, errerror) { iferr := f.checkValid("read"); err !=n...
typeLimitedReaderstruct{RReader// underlying readerNint64// max bytes remaining}func(l*LimitedReader)Read(p[]byte)(nint,errerror){ifl.N<=0{return0,EOF}ifint64(len(p))>l.N{// 经过这一层,就非常有可能出现我们之前提到的第四种情况,并且是个常态;p=p[0:l.N]}n,err=l.R.Read(p)l.N-=...
fmt.Printf("wrote %d bytes\n", n4) w.Flush() } 几种读取文件方法速度比较 package main import ( "bufio" "fmt" "io" "io/ioutil" "os" "time" ) func read0(path string) string { f, err := ioutil.ReadFile(path) if err != nil { fmt.Printf("%s\n", err) panic(err) } retu...
Notice treating EOF.Readtries to fillbufon each call, and returnsio.EOFas error if it reaches end of file in doing so. In this casebufwill still hold data. Consequent calls toReadreturns zero as the number of bytes read and sameio.EOFas error. Any other error will lead to a panic. ...
=nil{log.Printf("Failed to open file %s,err:%s",*filename,err.Error())os.Exit(1)}deferf.Close()buf:=bufio.NewReader(f)for{line,err:=buf.ReadBytes('\n')log.Print(string(line))iferr!=nil{iferr==io.EOF{log.Println("end of file")break}else{log.Printf("read file err:%s",...
这里还有几个类似的方法,非常接近,就不单独演示了 区别在于,ReadBytes它返回一个字节切片([]byte) 5. Scanner 扫描 特点: 自己定义一个扫描函数,然后按照规则扫描;如果不指定扫描器,它和单独按照行读取类型; 返回内容不包含换行符 packagemainimport("bufio""fmt"...
read() attempts to read nbyte bytes of data from the object referenced by the descriptor fildes into the buffer pointed to by buf. readv() performs the same action, but scatters the input data into the iovcnt buffers specified by the members of the iov array: iov[0], iov[1], ......
它有一个专门用于此的功能: ReadFile()func ReadFile(filename string) ([]byte, error)用法示例:...