Merge pull request #17 from flycash/ftr/download

Add download example

httpserver/download/main.go

@@ -0,0 +1,51 @@
+// Copyright 2020 beego-dev
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"github.com/astaxie/beego"
+)
+
+func main() {
+	ctrl := &MainController{}
+	beego.Router("/download", ctrl, "get:Download")
+	beego.Router("/download_file", ctrl, "get:DownloadFile")
+	beego.Run()
+}
+
+type MainController struct {
+	beego.Controller
+}
+
+func (ctrl *MainController) DownloadFile() {
+	// The file LICENSE is under root path.
+	// and the downloaded file name is license.txt
+	ctrl.Ctx.Output.Download("LICENSE", "license.txt")
+}
+
+// Download is an example that download the content stored in memory
+// when you access localhost:8080/download
+// A file named "mytest.txt" with content "Hello" will be downloaded
+func (ctrl *MainController) Download() {
+	output := ctrl.Ctx.Output
+	output.Header("Content-Disposition", "attachment;filename=mytest.txt;")
+	output.Header("Content-Description", "File Transfer")
+	output.Header("Content-Type", "application/octet-stream")
+	output.Header("Content-Transfer-Encoding", "binary")
+	output.Header("Expires", "0")
+	output.Header("Cache-Control", "must-revalidate")
+	output.Header("Pragma", "public")
+	ctrl.Ctx.WriteString("Hello")
+}