go gin上传文件

multipart/form-data

func Upload(c *gin.Context) {
	file, err := c.FormFile("file")
	if err != nil {
		c.String(500, "上传图片出错")
	}

	extName := path.Ext(file.Filename)
	allowExtMap := map[string]bool{
		".jpg":  true,
		".png":  true,
		".gif":  true,
		".jpeg": true,
	}
	if _, ok := allowExtMap[extName]; !ok {
		c.String(200, "文件类型不合法")
		return
	}

	dir := "./upload/" + helper.GetDay()
	if err := os.MkdirAll(dir, 0755); err != nil {
		log.Println(err)
	}
	fileUnixName := strconv.FormatInt(helper.GetUnix(), 10)
	dst := path.Join(dir, fileUnixName+extName)
	fmt.Println(dst)
	err2 := c.SaveUploadedFile(file, dst)
	if err2 != nil {
		return
	}
	c.String(http.StatusOK, dst)
}

base64编码

// base64
func Upload2(c *gin.Context) {
	content := c.Request.FormValue("content")
	if len(content) == 0 {
		c.String(400, "base64编码为空")
	}

	dir := "./upload/" + helper.GetDay()
	if err := os.MkdirAll(dir, 0755); err != nil {
		log.Println(err)
	}
	fileUnixName := strconv.FormatInt(helper.GetUnix(), 10)
	dst := path.Join(dir, fileUnixName+".jpg")
	fmt.Println(dst)

	fileObj, err := os.OpenFile(dst, os.O_CREATE|os.O_WRONLY, 0644)
	if err != nil {
		fmt.Println("打开文件出错，err:", err)
		return
	}
	// 向打开的文件句柄中写入内容
	fmt.Fprintf(fileObj, "%s", Base64Decode(content))
	core.Success(c, 204, dst)
}

func Base64Decode(str string) string {
	reader := strings.NewReader(str)
	decoder := base64.NewDecoder(base64.RawStdEncoding, reader)
	buf := make([]byte, 1024)
	dst := ""
	for {
		n, err := decoder.Read(buf)
		dst += string(buf[:n])
		if n == 0 || err != nil {
			break
		}
	}
	return dst
}

参考

https://blog.csdn.net/qq_55752792/article/details/126330655

https://blog.csdn.net/taoshihan/article/details/113895681