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package main

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

/*
首先在这个文件的同级目录新建一个uploads文件夹
*/
const (
	UPLOAD_DIR = "./uploads"
)

func uploadHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method == "GET" {
		io.WriteString(w, "<html><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>")

		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
	w.Header().Set("Content-Type", "image")
	http.ServeFile(w, r, imagePath)
}

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

http://127.0.0.1:8080/upload 访问网址即可

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