A small example use go-sdk building a upload webpage 本文演示用七牛Go-SDK用Go语言创建一个上传文件的页面。本例演示了三种不同的上传方式：
第一种是不指定文件的key，那么七牛云存储将自动为文件生成一个key
第二种是指定文件的key
第三种是指定文件的key并且制定Custom Field
文件上传成功后将跳转到另外的页面显示上传完成文件的信息。
在运行本样例之前请确保已安装go语言的编译器。下面操作都是在Mac OS X下运行。
#下载Go－SDK 下载七牛Go-SKD： 在命令行下运行：
go get github.com/qiniu/api
#创建一个go语言文件
创建一个名为 main.go的文件内容如下：
package main
import (
"log"
"fmt"
"net/http"
"encoding/base64"
"encoding/json"
"github.com/qiniu/api/rs"
. "github.com/qiniu/api/conf"
)
const (
BUCKET = "APPLY YOUR BUCKET NAME HERE" // change to own space name
DOMAIN = "APPLY YOUR DOMAIN HERE" // For example: myspace.qiniudn.com
)
// --------------------------------------------------------------------------------
func init() {
ACCESS_KEY = "" // Apply Access key here
SECRET_KEY = "" // Apply Secret key here
if ACCESS_KEY == "" || SECRET_KEY == "" {
panic("require ACCESS_KEY & SECRET_KEY")
}
}
// --------------------------------------------------------------------------------
// HTML code that will be shown on the webpage
//Simple upload without assigning key for the image you want to upload
var uploadFormFmt = `
<html>
<body>
<form method="post" action="http://up.qiniu.com/" enctype="multipart/form-data">
<input name="token" type="hidden" value="%s">
Image to upload: <input name="file" type="file"/>
<input type="submit" value="Upload">
</form>
</body>
</html>
`
//Assign a key for the image you want to upload
var uploadWithKeyFormFmt = `
<html>
<body>
<form method="post" action="http://up.qiniu.com/" enctype="multipart/form-data">
<input name="token" type="hidden" value="%s">
Image key in qiniu cloud storage: <input name="key" value="foo bar.jpg"><br>
Image to upload: <input name="file" type="file"/>
<input type="submit" value="Upload">
</form>
</body>
</html>
`
//Assign both key and custom field
var uploadWithkeyAndCustomFieldFmt = `
<html>
<body>
<form method="post" action="http://up.qiniu.com/" enctype="multipart/form-data">
<input name="token" type="hidden" value="%s">
<input name="x:custom_field_name" value="x:custom_field_name">
Image key in qiniu cloud storage: <input name="key" value="foo bar.jpg"><br>
Image to upload: <input name="file" type="file"/>
<input type="submit" value="Upload">
</form>
</body>
</html>
`
var returnPageFmt = `
<html>
<body>
<p>%s
<p>ImageDownloadUrl: %s
<p><a href="/upload">Back to upload</a>
<p><a href="/upload2">Back to uploadWithKey</a>
<p><a href="/upload3">Back to uploadWithkeyAndCustomField</a>
<p><img src="%s">
</body>
</html>
`
type UploadRet struct {
Key string `json:"key"`
}
func handleReturn(w http.ResponseWriter, req *http.Request) {
ret := req.FormValue("upload_ret")
b, err := base64.URLEncoding.DecodeString(ret)
if err != nil {
w.WriteHeader(404)
return
}
var uploadRet UploadRet
err = json.Unmarshal(b, &uploadRet)
if err != nil {
w.WriteHeader(404)
return
}
policy := rs.GetPolicy{Scope: "*/" + uploadRet.Key}
img := policy.MakeRequest(rs.MakeBaseUrl(DOMAIN, uploadRet.Key))
returnPage := fmt.Sprintf(returnPageFmt, string(b), img, img)
w.Write([]byte(returnPage))
}
func handleUpload(w http.ResponseWriter, req *http.Request) {
policy := rs.PutPolicy{Scope: BUCKET, ReturnUrl: "http://localhost:8765/uploaded"}
token := policy.Token()
log.Println("token:", token)
uploadForm := fmt.Sprintf(uploadFormFmt, token)
w.Write([]byte(uploadForm))
}
func handleUploadWithKey(w http.ResponseWriter, req *http.Request) {
policy := rs.PutPolicy{Scope: BUCKET, ReturnUrl: "http://localhost:8765/uploaded"}
token := policy.Token()
log.Println("token:", token)
uploadForm := fmt.Sprintf(uploadWithKeyFormFmt, token)
w.Write([]byte(uploadForm))
}
func handleUploadWithKeyAndCustomField(w http.ResponseWriter, req *http.Request) {
policy := rs.PutPolicy{Scope: BUCKET, ReturnUrl: "http://localhost:8765/uploaded"}
token := policy.Token()
log.Println("token:", token)
uploadForm := fmt.Sprintf(uploadWithkeyAndCustomFieldFmt, token)
w.Write([]byte(uploadForm))
}
func handleDefault(w http.ResponseWriter, req *http.Request) {
http.Redirect(w, req, "/upload", 302)
}
func main() {
http.HandleFunc("/", handleDefault)
http.HandleFunc("/upload", handleUpload)
http.HandleFunc("/upload2", handleUploadWithKey)
http.HandleFunc("/upload3", handleUploadWithKeyAndCustomField)
http.HandleFunc("/uploaded", handleReturn)
log.Fatal(http.ListenAndServe(":8765", nil))
}
// --------------------------------------------------------------------------------
#运行程序
运行下面命令：
export GOPATH=/"THE PATH TO GO-SDK"
go run main.go
然后访问：httlp://localhost:8765/upload3 即可看到建好的页面