如何跟踪在golang

Question

我试图跟踪GOLANG上传进度的上传进度，这就是我得到的那一刻

func Upload(w http.ResponseWriter, req *http.Request) { 

    mr, err := req.MultipartReader() 
    if err != nil { 
     return 
    } 

    for { 
     // var part *multipart.Part 
     part, err := mr.NextPart() 
     mr.partsRead 

     if err == io.EOF { 
      break 
     } 
     println(part) 

    } 

} 

Answer 1

这将工作，一个流到calc下字节阅读以及总体进度，您需要指向流某处，在此代码示例中，我将其指向了一个文件。

func Upload(w http.ResponseWriter, req *http.Request) { 

    mr, err := req.MultipartReader() 
    if err != nil { 
     return 
    } 
    length := req.ContentLength 
    for { 

     part, err := mr.NextPart() 
     if err == io.EOF { 
      break 
     } 
     var read int64 
     var p float32 
     dst, err := os.OpenFile("dstfile", os.O_WRONLY|os.O_CREATE, 0644) 
     if err != nil { 
      return 
     } 
     for { 
      buffer := make([]byte, 100000) 
      cBytes, err := part.Read(buffer) 
      if err == io.EOF { 
       break 
      } 
      read = read + int64(cBytes) 
      //fmt.Printf("read: %v \n",read) 
      p = float32(read)/float32(length) *100 
      fmt.Printf("progress: %v \n",p) 
      dst.Write(buffer[0:cBytes]) 
     } 
    } 
}