Javascript 从golang服务器在浏览器中下载压缩文件
我正在尝试从Go Web服务器下载压缩文件。我已经成功地压缩了文件,并且可以从服务器的目录中解压它。我遇到的问题是提供文件并用Javascript下载它 以下是我的代码概述: 1) 向从另一个端点检索数据的服务器发出请求 2) 根据用户想要的文件类型(CSV(setupCSVRows函数)或JSON)构造返回的数据 3) 将字节从缓冲区写入文件并返回文件地址 4) 当用户单击链接时,使用文件地址发出http get请求,并在新窗口中打开内容进行下载 每次我尝试解压文件时都会出现错误:存档文件不完整(使用Unarchiver程序),Mac上的默认存档实用程序会显示一个简短的加载屏幕,然后关闭 Go代码:Javascript 从golang服务器在浏览器中下载压缩文件,javascript,angularjs,go,zip,Javascript,Angularjs,Go,Zip,我正在尝试从Go Web服务器下载压缩文件。我已经成功地压缩了文件,并且可以从服务器的目录中解压它。我遇到的问题是提供文件并用Javascript下载它 以下是我的代码概述: 1) 向从另一个端点检索数据的服务器发出请求 2) 根据用户想要的文件类型(CSV(setupCSVRows函数)或JSON)构造返回的数据 3) 将字节从缓冲区写入文件并返回文件地址 4) 当用户单击链接时,使用文件地址发出http get请求,并在新窗口中打开内容进行下载 每次我尝试解压文件时都会出现错误:存档文件不完
func ExportData(writer http.ResponseWriter, req *http.Request, session sessions.Session) (int, string) {
headers := HeaderCreation{
OriginalRequest: req,
Session: session,
}
qs := req.URL.Query()
if len(qs["collectionID"]) != 1 {
return 400, "ERROR: Must submit one collectionID in query string"
}
if len(qs["fileType"]) != 1 {
return 400, "ERROR: Must submit one fileType in query string"
}
collID := qs["collectionID"][0]
fileType := qs["fileType"][0]
url := "http://" + config.Data.Address + "/api/" + collID
response, err := httpClient.DoSystemRequest("GET", url, nil, headers)
if err != nil {
return 500, "ERROR: Could not resolve DataURL/api" + err.Error()
} else {
contents, err := ioutil.ReadAll(response.Body)
response.Body.Close()
if err != nil {
return 400, "ERROR: Response from Platform unreadable"
}
buf := new(bytes.Buffer)
w := zip.NewWriter(buf)
file, err := w.Create(collID + "." + fileType)
if err != nil {
return 400, "ERROR: Unable to create zip file with name of: " + collID + " and type of: " + fileType + "; " + err.Error()
}
switch fileType {
case "csv":
rows, err := setupCSVRows(contents)
if err != nil {
return 400, err.Error()
}
_, err = file.Write(rows)
if err != nil {
return 400, "Unable to write CSV to zip file; " + err.Error()
}
case "json":
_, err := file.Write(contents)
if err != nil {
return 400, err.Error()
}
} // end switch
err = w.Close()
if err != nil {
return 400, "ERROR: Unable to close zip file writer; " + err.Error()
}
//create fileName based on collectionID and current time
fileAddress := collID + strconv.FormatInt(time.Now().Unix(), 10)
//write the zipped file to the disk
ioutil.WriteFile(fileAddress + ".zip", buf.Bytes(), 0777)
return 200, fileAddress
} //end else
}
func ReturnFile(writer http.ResponseWriter, req *http.Request) {
queries := req.URL.Query()
fullFileName := queries["fullFileName"][0]
http.ServeFile(writer, req, fullFileName)
//delete file from server once it has been served
//defer os.Remove(fullFileName)
}
func setupCSVRows(contents []byte) ([]byte, error) {
//unmarshal into interface because we don't know json structure in advance
var collArr interface{}
jsonErr := json.Unmarshal(contents, &collArr)
if jsonErr != nil {
return nil, errors.New("ERROR: Unable to parse JSON")
}
//had to do some weird stuff here, not sure if it's the best method
s := reflect.ValueOf(collArr)
var rows bytes.Buffer
var headers []string
for i := 0; i < s.Len(); i++ {
var row []string
m := s.Index(i).Interface()
m2 := m.(map[string]interface{})
for k, v := range m2 {
if i == 0 {
if k != "item_id" {
headers = append(headers, k)
}
}
if k != "item_id" {
row = append(row, v.(string))
}
}
if i == 0 {
headersString := strings.Join(headers, ",")
rows.WriteString(headersString + "\n")
}
rowsString := strings.Join(row, ",")
rows.WriteString(rowsString + "\n")
}
return rows.Bytes(), nil
}
正如您所看到的,我尝试了许多不同的URI方案来下载文件,但都没有效果
我需要在服务器端设置MIME类型吗
任何帮助都将不胜感激。如果我需要更多的细节,请告诉我。我最终选择了一条稍微不同的路线。现在,我在响应头上设置MIME类型,并创建指向该文件的链接 Go代码:
func ReturnFile(writer http.ResponseWriter, req *http.Request) {
queries := req.URL.Query()
fullFileName := queries["fullFileName"][0]
writer.Header().Set("Content-type", "application/zip")
http.ServeFile(writer, req, fullFileName)
//delete file from server once it has been served
defer os.Remove(fullFileName)
}
角度用户界面代码:
<a ng-show="complete" href="/api/batch/export/files?fullFileName={{fileAddress}}">Download {{currentCollection.name}}</a>
这会自动触发下载,并且zip文件不再损坏 我无法评论(新用户)-但是关于命名文件,只需在提供服务之前设置标题即可(使用了ServeContent,但应可在此处互换):
在JS中使用
+
操作符是否强制转换为字符串?谢谢您的示例!我的压缩文件下载为“下载”。有没有办法保留文件名的名称?谢谢。我给+1,这样你下次可以评论。
<a ng-show="complete" href="/api/batch/export/files?fullFileName={{fileAddress}}">Download {{currentCollection.name}}</a>
func serveFile(w http.ResponseWriter, r *http.Request){
data, err := ioutil.ReadFile("path/to/file/and/file+ext")
if(err != nil){
log.Fatal(err)
}
w.Header().Set("Content-Type", "application/octet-stream")
w.Header().Set("Content-Disposition", "attachment; filename=" + "fileName.here")
w.Header().Set("Content-Transfer-Encoding", "binary")
w.Header().Set("Expires", "0")
http.ServeContent(w, r, "path/to/file/and/file+ext", time.Now(), bytes.NewReader(data))
}