```go
package main
import (
"crypto/rand"
"fmt"
ruisUtil "github.com/mgr9525/go-ruisutil"
"io"
"net/http"
"os"
"strconv"
"time"
"context"
)
func randomBoundarys() string {
var buf [30]byte
_, err := io.ReadFull(rand.Reader, buf[:])
if err != nil {
panic(err)
}
return fmt.Sprintf("%x", buf[:])
}
func uploadss(url,flpath string){
ctx, _ := context.WithCancel(context.Background())
body := ruisUtil.NewCircleByteBuffer(ctx,10240000)
boundary:=randomBoundarys()
boundarybytes := []byte("\r\n--" + boundary + "\r\n")
endbytes := []byte("\r\n--" + boundary + "--\r\n")
reqest, err := http.NewRequest("POST", url, body)
if err != nil { panic(err) }
reqest.Header.Add("Connection", "keep-alive")
reqest.Header.Add("Content-Type", "multipart/form-data; charset=utf-8; boundary="+boundary)
go func() {
//defer ruisRecovers("upload.run")
f, err := os.OpenFile(flpath, os.O_RDONLY, 0666) //其实这里的 O_RDWR应该是 O_RDWR|O_CREATE，也就是文件不存在的情况下就建一个空文件，但是因为windows下还有BUG，如果使用这个O_CREATE，就会直接清空文件，所以这里就不用了这个标志，你自己事先建立好文件。
if err != nil { panic(err) }
stat, err := f.Stat() //获取文件状态
if err != nil { panic(err) }
defer f.Close()
header:=fmt.Sprintf("Content-Disposition: form-data; name=\"upfile\"; filename=\"%s\"\r\nContent-Type: application/octet-stream\r\n\r\n",stat.Name())
body.Write(boundarybytes)
body.Write([]byte(header))
fsz:=float64(stat.Size())
fupsz:=float64(0)
buf:=make([]byte,10240000)
for {
time.Sleep(10*time.Microsecond)//减缓上传速度，看进度效果
n,err:=f.Read(buf)
fmt.Println(err)
if err==io.EOF {
break
}
if n>0{
nz,_:=body.Write(buf[0:n])
fupsz+=float64(nz)
progress := strconv.Itoa(int((fupsz / fsz) * 100))+"%"
fmt.Println("upload:",progress,"|",strconv.FormatFloat(fupsz,'f',0,64),"/",stat.Size())
}
}
body.Write(endbytes)
body.Write(nil)//输入EOF,表示数据写完了
}()
resp,err:=http.DefaultClient.Do(reqest)
fmt.Println(resp)
if err != nil { panic(err) }
defer resp.Body.Close()
if resp.StatusCode==200{
fmt.Println("上传成功")
}else{
fmt.Println("上传失败,StatusCode:",resp.StatusCode)
}
}
// sample usage
func main() {
uploadss("http://103.18.10.5:8080/PutFile","D:\\go1.14.3.windows-amd64.zip")
}
```
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