路由配置

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//文件下载
router.GET("/download", DownloadFileService)

控制层

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/**
下载文件
*/
func DownloadFileService(c *gin.Context) {
	fileDir := "./static/export/"
	fileName := c.Query("file")
	//打开文件
	fileSource, errByOpenFile := os.Open(fileDir + fileName)
	//非空处理
	if helper.IsEmpty(fileDir) || helper.IsEmpty(fileName) || errByOpenFile != nil {
		/*c.JSON(http.StatusOK, gin.H{
		    "success": false,
		    "message": "失败",
		    "error":   "资源不存在",
		})*/
		c.Redirect(http.StatusFound, "/404")
		return
	}
	c.Header("Content-Type", "application/octet-stream")
	c.Header("Content-Disposition", "attachment; filename="+fileName)
	c.Header("Content-Transfer-Encoding", "binary")
	c.File(fileDir + "/" + fileName)
	//一定要关闭文件  否则文件资源会一直被占用
	fileSource.Close()

	return
}

访问连接

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www.xxxx.com/download?file=xxxx.csv