go log写入文件中

package main

import (
	"log"
	"os"
)

func main() {
	file, err := os.OpenFile("logfile.log", os.O_CREATE|os.O_APPEND|os.O_RDWR, os.ModePerm)
	if err != nil {
		return
	}

	defer file.Close()

	log.SetOutput(file)
	log.SetFlags(log.Llongfile)
	log.Println("test")

}