http form transfer/upload multiple files to golang server

//http  

POST http://localhost/upload HTTP/1.1
Host: localhost
Proxy-Connection: keep-alive
Content-Length: 468
Cache-Control: max-age=0
Origin: null
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary5hABI1kzSBUwtzsB
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
DNT: 1
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.6,en;q=0.4

------WebKitFormBoundary5hABI1kzSBUwtzsB
Content-Disposition: form-data; name="files"; filename="a.txt"
Content-Type: text/plain

5522H-HY5KC-VL6QQ-IGCHV-YJP2H
------WebKitFormBoundary5hABI1kzSBUwtzsB
Content-Disposition: form-data; name="files"; filename="b.txt"
Content-Type: text/plain

asd

sadfa
dga
df
g
------WebKitFormBoundary5hABI1kzSBUwtzsB
Content-Disposition: form-data; name="submit"

提交
------WebKitFormBoundary5hABI1kzSBUwtzsB--

//HTML

<form action="http://localhost/upload" enctype="multipart/form-data" method="post">
<input type="file" name="files" id="files" multiple>
<input type="submit" name="submit" >
</form>

//XMLHttpRequest

1.       function uploadFile() {  
2.         var fd = new FormData();  
3.         var file=document.getElementById("files")
4.         for (var i=0;i<file.files.length;i++){
5.              fd.append("files",file.files[i])
6.         }

1.         var xhr = new XMLHttpRequest();  
2.         xhr.upload.addEventListener("progress", uploadProgress, false);  
3.         xhr.addEventListener("load", uploadComplete, false);  
4.         xhr.addEventListener("error", uploadFailed, false);  
5.         xhr.addEventListener("abort", uploadCanceled, false);  
6.         xhr.open("POST", "test2.php");  
7.         xhr.send(fd);  
8.       }  
9.   
10.       function uploadProgress(evt) {  
11.         if (evt.lengthComputable) {  
12.           var percentComplete = Math.round(evt.loaded * 100 / evt.total);  
13.           document.getElementById('progressNumber').innerHTML = percentComplete.toString() + '%';  
14.         }  
15.         else {  
16.           document.getElementById('progressNumber').innerHTML = 'unable to compute';  
17.         }  
18.       }  
19.   
20.       function uploadComplete(evt) {  
21.         /* This event is raised when the server send back a response */  
22.         alert(evt.target.responseText);  
23.       }  
24.   
25.       function uploadFailed(evt) {  
26.         alert("There was an error attempting to upload the file.");  
27.       }  
28.   
29.       function uploadCanceled(evt) {  
30.         alert("The upload has been canceled by the user or the browser dropped the connection.");  
31.       }  

//main.go

func uploadFile(w http.ResponseWriter, r *http.Request) {

r.ParseMultipartForm(10 << 30)

fhs := r.MultipartForm.File["myUploadFile"]

for _, v := range fhs {

file, err := v.Open()

if err != nil {

f.Println(err)

f.Fprintf(w, err.Error())

return

}

javahandler.OnFileReceived(v.Filename)

mf, err := os.OpenFile(str_storagePath+v.Filename, os.O_WRONLY|os.O_CREATE, 0666)

if err != nil {

f.Println(err)

f.Fprintf(w, err.Error())

return

}

defer mf.Close()

io.Copy(mf, file)

    }