Go Photo Upload

This is a creation in Article, where the information may have evolved or changed.

Use the go language to implement the image upload function, server and client source code.

Server-side code:

Uploadfile_server.gopackage Mainimport (//"CRYPTO/MD5" "FMT"//"html/template" "io" "Log" "Net/http" "OS"//"StrConv" "Time")//check whether the directory exists func checkfileisexist (filename string) bool {var exist = Trueif _, Err: = OS. Stat (filename); Os. Isnotexist (Err) {FMT. Print (filename + "not exist") exist = False}return Exist}func Main () {http. Handlefunc ("/upload", upload) Err: = http. Listenandserve (": 9090", nil)//Set the listening port if err! = Nil {log. Fatal ("Listenandserve:", err)}log. Println ("success!")} Handle the/upload logical func upload (w http. Responsewriter, R *http. Request) {fmt. Println ("Method:", R.method)//Get the requested method/*if R.method = = "Get" {crutime: = time. Now (). Unix () H: = MD5. New () Io. WriteString (H, StrConv. Formatint (Crutime, Ten)) token: = Fmt. Sprintf ("%x", H.sum (nil)) T, _: = template. Parsefiles ("Upload.gtpl") T.execute (W, token)} else */fmt.  Println (r) If R.method = = "POST" {r.parsemultipartform (<<) file, handler, err: = R.formfile ("UploadFile") If err ! = Nil {fmt. PRINTLN (Err) return}defer file. Close () fmt. fprintf (W,"%v", handler. Header)//bool_fileexist: = Checkfileisexist ("./test") fmt. Println ("Check file 1-----------------") fmt. Println ("-------------------------bool_fileexist:", bool_fileexist) if bool_fileexist {//If the folder exists//f, err1 = os. OpenFile (filename, os. O_append, 0666)//Open file F, err: = OS. OpenFile ("./test/" +handler. Filename, OS. O_wronly|os. O_create, 0666) if err! = Nil {fmt. PRINTLN (Err) return}defer f.close () io. Copy (f, file) Fmt. Println ("folder exists")} else {//The folder is not present when you first create a folder and then upload err1: = os. Mkdir ("./test", Os. Modeperm)//Create folder if ERR1! = nil {fmt. PRINTLN (Err) return}fmt. Println ("folder does not exist") fmt. Println ("Folder creation succeeded! ") F, err: = OS. OpenFile ("./test/" +handler. Filename, OS. O_wronly|os. O_create, 0666) if err! = Nil {fmt. PRINTLN (Err) return}defer f.close () io. Copy (f, File)}}

Client code:

Uploadfile_client.gopackage mainimport ("bytes" "FMT" "io" "io/ioutil" "Mime/multipart" "Nettp" "OS") Func Postfile ( FileName string, TargetUrl string) error {bodybuf: = &bytes. Buffer{}bodywriter: = multipart. Newwriter (BODYBUF)//Key step operation FileWriter, err: = Bodywriter.createformfile ("UploadFile", filename) if err! = Nil {fmt. PRINTLN ("Error writing to buffer") return err}//Open file handle operation FH, err: = OS. Open (filename) if err! = Nil {fmt. PRINTLN ("Error opening file") return Err}defer FH. Close ()//iocopy_, err = io. Copy (FileWriter, FH) if err! = Nil {return Err}contenttype: = Bodywriter.formdatacontenttype () bodywriter.close () RESP, ERR: = http. Post (TargetUrl, ContentType, Bodybuf) fmt. Println (BODYBUF) if err! = Nil {return Err}defer resp. Body.close () resp_body, err: = Ioutil. ReadAll (resp. Body) If err! = Nil {return err}fmt. Println (resp. Status) fmt. Println (String (resp_body)) return nil}//sample Usagefunc main () {target_url: = "http://xxx.xxx.xxx.xxx:9090/upload"// Here is your own IP address filename: = "image2.jpg" postfile (filename, Target_url)} 

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