`ioutil.WriteFile()`

WriteFile writes data to a file named by filename. If the file does not exist, WriteFile creates it with permissions perm (before umask); otherwise WriteFile truncates it before writing, without changing permissions.

package main

import (
	"io/ioutil"
	"log"
)

func main() {
	message := []byte("Hello, Gophers!")
	err := ioutil.WriteFile("hello", message, 0644)
	if err != nil {
		log.Fatal(err)
	}
}

`Write()`

package main

import (
	"fmt"
	"os"
)

func check(e error) {
	if e != nil {
		panic(e)
	}
}

func main() {
	f, err := os.Create("/tmp/dat2")
	check(err)

	defer f.Close()

	d2 := []byte{115, 111, 109, 102, 10}
	n2, err := f.Write(d2)
	check(err)
	fmt.Printf("wrote %d bytes\n", n2)
}

`WriteString()`

package main

import (
	"fmt"
	"os"
)

func check(e error) {
	if e != nil {
		panic(e)
	}
}

func main() {
	f, err := os.Create("/tmp/dat2")
	check(err)
	defer f.Close()

	n3, err := f.WriteString("writes\n")
	check(err)
	fmt.Printf("wrote %d bytes\n", n3)

	f.Sync()
}

`Writer`

package main

import (
	"bufio"
	"fmt"
	"os"
)

func check(e error) {
	if e != nil {
		panic(e)
	}
}

func main() {
	f, err := os.Create("/tmp/dat2")
	check(err)
	defer f.Close()

	w := bufio.NewWriter(f)
	n4, err := w.WriteString("buffered\n")
	check(err)
	fmt.Printf("wrote %d bytes\n", n4)

	w.Flush()
}

Reference

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【Golang】使用 - 写入文件