1.http.ServeFile

function Download(c *Gin.Context){

????filename:="test"

????localPath:="d:/test/201912/33/a.pdf"

????c.Writer.Header().Set("Content-Type", "text/pdf")

????c.Writer.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=%s.pdf", filename))

????http.ServeFile(c.Writer, c.Request, localPath)

}

2.?ioutil.ReadAll

function Download(c *Gin.Context){
????res, err :=http.Get("http://test.com/a.pdf")

????if err !=nil {

????????panic(err)

????}

????content, err := ioutil.ReadAll(res.Body)

????if err != nil {

? ? ? ? ?panic(err)

????}

????filename :=url.QueryEscape("test.pdf")// 防止中文亂碼

????c.Writer.Header().Add("Content-Type", "application/octet-stream")

????c.Writer.Header().Add("Content-Disposition", "attachment; filename=\""+filename+"\"")

????c.Writer.Write(content)

}

3.io.Copy

function Download(c *Gin.Context){

????res, err :=http.Get("http://test.com/a.pdf")

????if err !=nil {

????????panic(err)

????}

????filename :=url.QueryEscape("test.pdf")// 防止中文亂碼

????c.Writer.Header().Add("Content-Type", "application/octet-stream")

????c.Writer.Header().Add("Content-Disposition", "attachment; filename=\""+filename+"\"")

????io.Copy(c.Writer, res.Body)

}