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golang学习之文件上传

2016-05-30 13:40 323 查看

首先是上传页面upload.html：

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Upload</title>
</head>
<body>
<form method="POST" action="/upload" enctype="multipart/form-data">
Choose an image to upload: <input name="image" type="file" />
<input type="submit" value="Upload" />
</form>
</body>
</html>

文件上传代码：

package main

import (
"html/template"
"io"
"log"
"net/http"
"os"
)

const (
UPLOAD_DIR = "./uploads"
)

func uploadHandler(w http.ResponseWriter, r *http.Request) {
if r.Method == "GET" {
t, err := template.ParseFiles("upload.html")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
t.Execute(w, nil)
return
}
if r.Method == "POST" {
f, h, err := r.FormFile("image")
if err != nil {
http.Error(w, err.Error(),
http.StatusInternalServerError)
return
}
filename := h.Filename
defer f.Close()
t, err := os.Create(UPLOAD_DIR + "/" + filename)
if err != nil {
http.Error(w, err.Error(),
http.StatusInternalServerError)
return
}
defer t.Close()
if _, err := io.Copy(t, f); err != nil {
http.Error(w, err.Error(),
http.StatusInternalServerError)
return
}
http.Redirect(w, r, "/view?id="+filename,
http.StatusFound)
}
}

func viewHandler(w http.ResponseWriter, r *http.Request) {
imageId := r.FormValue("id")
imagePath := UPLOAD_DIR + "/" + imageId
if exists := isExists(imagePath); !exists {
http.NotFound(w, r)
return
}
w.Header().Set("Content-Type", "image")
http.ServeFile(w, r, imagePath)
}
func isExists(path string) bool {
_, err := os.Stat(path)
if err == nil {
return true
}
return os.IsExist(err)
}

func main() {
http.HandleFunc("/view", viewHandler)
http.HandleFunc("/upload", uploadHandler)
err := http.ListenAndServe(":8080", nil)
if err != nil {
log.Fatal("ListenAndServe: ", err.Error())
}
}

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