利用golang怎么实现一个文件上传功能-创新互联
这篇文章将为大家详细讲解有关利用golang怎么实现一个文件上传功能，文章内容质量较高，因此小编分享给大家做个参考，希望大家阅读完这篇文章后对相关知识有一定的了解。
具体如下
package main
import (
"bufio"
"encoding/base64"
"errors"
"fmt"
"io"
"net"
"net/url"
"os"
"path/filepath"
"strconv"
"strings"
"unsafe"
)
func main() {
if len(os.Args) != 3 {
fmt.Printf(`usage: %s ip:port user:pass
get file:
wget --auth-no-challenge --user=user --password=pass --content-disposition "http://ip:port?/home/tmp.txt"
curl -u user:pass -OJ "http://ip:port?/home/tmp.txt"
post file:
wget -qO - --auth-no-challenge --user=user --password=pass --post-file=C:\tmp.txt "http://ip:port?/home/tmp.txt"
curl -u user:pass --data-binary @C:\tmp.txt "http://ip:port?/home/tmp.txt"
`, os.Args[0])
return
}
addr, err := net.ResolveTCPAddr("tcp", os.Args[1])
if err != nil {
panic(err)
}
ser, err := net.ListenTCP("tcp", addr)
if err != nil {
panic(err)
}
fmt.Printf("Listen: [%s]\n", addr)
authStr = "Basic " + base64.StdEncoding.EncodeToString([]byte(os.Args[2]))
for {
ln, err := ser.AcceptTCP()
if err != nil {
panic(err)
}
go func(l *net.TCPConn) {
err := handleFile(l)
if err != nil {
respData(l, err.Error())
}
l.Close()
}(ln)
}
}
const (
maxMemory = 10 << 20 // 缓存10MB
respMsg = "HTTP/1.1 200 OK\r\nContent-Type:text/plain;charset=utf-8\r\nContent-Disposition:attachment;filename=resp.txt\r\nContent-Length:%d\r\n\r\n%s"
getHeader = "HTTP/1.1 200 OK\r\nContent-Type:application/octet-stream\r\nContent-Disposition:attachment;filename=%s\r\nContent-Length:%d\r\nContent-Transfer-Encoding:binary\r\n\r\n"
)
var authStr string // 授权信息
func respData(w io.Writer, data string) {
msg := data + "\r\n"
fmt.Fprintf(w, respMsg, len(msg), msg)
}
func handleFile(l *net.TCPConn) error {
br := bufio.NewReaderSize(l, maxMemory)
method, path, length, err := getHeaderMsg(br)
if err != nil {
return err
}
fmt.Printf("[%s - %s - %d]\n", method, path, length)
if method == "GET" {
return httpGetFile(path, l, length)
}
err = httpPostFile(path, br, length)
if err != nil {
return err
}
respData(l, "post ok")
return nil
}
// 内存复用,更快速,省内存
func bytesToString(b []byte) string {
return *(*string)(unsafe.Pointer(&b))
}
func getHeaderMsg(r *bufio.Reader) (string, string, int64, error) {
// 读取第一行,提取有用信息
line, _, err := r.ReadLine()
if err != nil {
return "", "", 0, err
}
header := strings.Fields(bytesToString(line))
if len(header) < 3 { // 首行至少3列数据
return "", "", 0, errors.New("header error")
}
method, path := header[0], ""
s := strings.Index(header[1], "?")
if s >= 0 {
path, _ = url.QueryUnescape(header[1][s+1:])
}
if path == "" { // ?号后面就是文件路径,需要解码url一下
return "", "", 0, errors.New("path error")
}
var length int64
if method == "GET" {
fi, err := os.Stat(path)
if err != nil {
return "", "", 0, err
}
length = fi.Size() // GET请求提前得到文件大小
} else if method != "POST" {
return "", "", 0, errors.New(method + " not support")
}
var authCheck string
for {
line, _, err = r.ReadLine()
if err != nil {
return "", "", 0, err
}
if len(line) == 0 {
break // 遇到空行,之后为请求体
}
header = strings.Split(bytesToString(line), ":")
if len(header) == 2 { // 头部[key: val]解析
header[0] = strings.ToLower(strings.TrimSpace(header[0]))
header[1] = strings.TrimSpace(header[1])
if method == "POST" && header[0] == "content-length" {
length, _ = strconv.ParseInt(header[1], 10, 64)
} else if header[0] == "authorization" {
authCheck = header[1]
}
}
}
if authCheck != authStr {
return "", "", 0, errors.New("authorization error")
}
return method, path, length, nil
}
func httpPostFile(path string, r io.Reader, length int64) error {
fw, err := os.Create(path)
if err != nil {
return err
}
defer fw.Close()
pr := newProgress(r, length)
_, err = io.CopyN(fw, pr, length)
pr.Close()
return err
}
func httpGetFile(path string, w io.Writer, size int64) error {
fr, err := os.Open(path)
if err != nil {
return err
}
defer fr.Close()
fmt.Fprintf(w, getHeader, filepath.Base(path), size)
pr := newProgress(fr, size)
_, err = io.Copy(w, pr)
pr.Close()
return err
}
type progress struct {
r io.Reader
cnt int64
rate chan int64
}
func newProgress(r io.Reader, size int64) io.ReadCloser {
p := &progress{r: r, rate: make(chan int64)}
// 之所以这样做进度,是因为打印耗性能,因此在协程中打印进度
// 在处理数据中用非阻塞方式往chan中传处理字节数
go func(rate <-chan int64, all int64) {
for cur := range rate {
fmt.Printf("\rhandle:%4d%%", cur*100/all)
}
fmt.Printf("\rhandle: 100%%\r\n\r\n")
}(p.rate, size)
return p
}
func (p *progress) Read(b []byte) (int, error) {
n, err := p.r.Read(b)
p.cnt += int64(n)
select { // 非阻塞方式往chan中写数据
case p.rate <- p.cnt:
default:
}
return n, err
}
func (p *progress) Close() error {
close(p.rate) // 关闭chan,通知打印协程退出
return nil
}食用方法
执行UpDownFile-h可以查看帮助文档，里面有wget和curl上传和下载文件的命令，方便忘记命令的时候copy一下下。
工具虽小，但确实解决了我个人的临时上传下载文件需求，再也不用到处安装各种服务器咯，爽爽哒。
usage: UpDownFile ip:port get file: wget --auth-no-challenge --user=user --password=pass --content-disposition "http://ip:port?/home/tmp.txt" curl -u user:pass -OJ "http://ip:port?/home/tmp.txt" post file: wget -qO - --auth-no-challenge --user=user --password=pass --post-file=C:\tmp.txt "http://ip:port?/home/tmp.txt" curl -u user:pass --data-binary @C:\tmp.txt "http://ip:port?/home/tmp.txt"
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