Go语言创建文件并追加内容

package main

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

func main() {
	//
	filePath := "D:/goProject/src/go_demo/files/test.txt"
	// O_APPEDN 追加方式
	file, err := os.OpenFile(filePath, os.O_WRONLY | os.O_APPEND, 0666)
	if err != nil {
		fmt.Printf("open file error=%v\n", err)
		return
	}
	defer file.Close()
	str := "hello golang\n"
	writer := bufio.NewWriter(file)
	for i := 0; i < 5; i++ {
		writer.WriteString(str)
	}
	writer.Flush()
}