Several methods for reading and writing files in golang-Golang-php.cn

Several methods for reading and writing files in golang

Several methods of reading and writing files in golang

The read files are placed in file/test: that is, the test under the file package file, write more files in it

Reading file method one:Use ioutil.ReadFile to read directly from the file into []byte

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func Read0() (string){ f, err := ioutil.ReadFile("file/test") if err != nil { fmt.Println("read fail", err) } return string(f) }

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Reading file method two:First read from the file to file, then read from file to buf, and then append buf to the final []byte

func Read1() (string){ //获得一个file f, err := os.Open("file/test") if err != nil { fmt.Println("read fail") return "" } //把file读取到缓冲区中 defer f.Close() var chunk []byte buf := make([]byte, 1024) for { //从file读取到buf中 n, err := f.Read(buf) if err != nil && err != io.EOF{ fmt.Println("read buf fail", err) return "" } //说明读取结束 if n == 0 { break } //读取到最终的缓冲区中 chunk = append(chunk, buf[:n]...) } return string(chunk) //fmt.Println(string(chunk)) }

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Reading file method three:First read from file to file, then read from file to Reader, read from Reader to buf, and buf is finally appended to []byte

//先从文件读取到file, 在从file读取到Reader中，从Reader读取到buf, buf最终追加到[]byte，这个排第三 func Read2() (string) { fi, err := os.Open("file/test") if err != nil { panic(err) } defer fi.Close() r := bufio.NewReader(fi) var chunks []byte buf := make([]byte, 1024) for { n, err := r.Read(buf) if err != nil && err != io.EOF { panic(err) } if 0 == n { break } //fmt.Println(string(buf)) chunks = append(chunks, buf...) } return string(chunks) //fmt.Println(string(chunks)) }

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Four ways to read files:Read into file, and then use ioutil to read the file directly into []byte

//读取到file中，再利用ioutil将file直接读取到[]byte中, 这是最优 func Read3() (string){ f, err := os.Open("file/test") if err != nil { fmt.Println("read file fail", err) return "" } defer f.Close() fd, err := ioutil.ReadAll(f) if err != nil { fmt.Println("read to fd fail", err) return "" } return string(fd) }

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