Buffer{} bodyWriter := multipart.NewWriter(bodyBuf) // this step is very important fileWriter, err := bodyWriter.CreateFormFile("uploadfile", 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()

bodyBuf := &bytes.Buffer{} bodyWriter := multipart.NewWriter(bodyBuf) //关键的一步操作 fileWriter, err := bodyWriter.CreateFormFile("uploadfile", filename) if err != nil { fmt.Println("error fmt.Println("error opening file") return err } //iocopy _, err = io.Copy(fileWriter, fh) if err != nil { return err } contentType := bodyWriter.FormDataContentType()

type Writer struct { 22 cw *countWriter 23 dir []*header 24 last *fileWriter 25 closed bool 26 } 27 28 type header struct { 29 *FileHeader 30 CreatorVersion = fh.CreatorVersion&0xff00 | 0x14 131 fh.ReaderVersion = 0x14 132 133 fw := &fileWriter{ 134 zipw: w.cw, 135 compCount: &countWriter{w: w.cw}, 136 crc32: 186 } 187 _, err := w.Write(h.Extra) 188 return err 189 } 190 191 type fileWriter struct { 192 *header 193 zipw io.Writer 194 rawCount *countWriter 195