如何使用Golang获取发布的二进制数据的文件名？

I am posting a csv file as a binary file using Postman REST API client. I need to get the filename of the uploaded file.

Here is a simple example of posting a csv file as binary data and storing the binary data as a csv file.

package main

import (   //"fmt"
           "net/http"
           "os"
           "io"
           "log"
           "github.com/gorilla/mux"
       )

func uploadData(w http.ResponseWriter, req *http.Request) {
    file, err := os.Create("hello.csv")
    _, err = io.Copy(file, req.Body)
    _ = err
}

func main(){
  router := mux.NewRouter()
  router.HandleFunc("/parse", uploadData).Methods("POST")
  log.Fatal(http.ListenAndServe(":8000", router))
}

Since, there is no filename associated with a HTTP request body. You have to send the filename in your URL if you want to get the filename.

package main

import (   
           "net/http"
           "os"
           "io"
           "log"
           "github.com/gorilla/mux"

       )

func uploadData(w http.ResponseWriter, req *http.Request) {
    params := mux.Vars(req)
    file, err := os.Create(params["fileName"])
    _, err = io.Copy(file, req.Body)
    if err!=nil{
      log.Printf("Error while Posting data")
    }
}

func main(){
  router := mux.NewRouter()
  router.HandleFunc("/upload/{fileName}", uploadData).Methods("POST")
  log.Fatal(http.ListenAndServe(":8000", router))
}

You could use an encoding, such as form-data, which includes the filename to upload file with postman. This will help you can send multipart/form-data request to server. After that you can extract file name from server side.

From server side

func uploadData(w http.ResponseWriter, req *http.Request) {
    _, header, _ := req.FormFile("demo")
    fmt.Println(header.Filename)
}