package main import ( "bytes" "encoding/base64" "flag" "html/template" "image" "image/color" "image/draw" "image/jpeg" "log" "net/http" "strconv" ) /* @Time: 2018-12-20 16:50 @Desc: */ var root = flag.String("root", ".", "file system path") func main() { http.HandleFunc("/blue", blueHandler) //http.HandleFunc("/red/", redHandler) http.Handle("/", http.FileServer(http.Dir(*root))) log.Println("Listening on 8080") err := http.ListenAndServe(":8080", nil) if err != nil { log.Fatal("ListenAndServe:", err) } } func blueHandler(w http.ResponseWriter, req *http.Request) { m := image.NewRGBA(image.Rect(0, 0, 6, 6)) blue := color.RGBA{255, 255, 255, 1} draw.Draw(m, m.Bounds(), &image.Uniform{blue}, image.ZP, draw.Src) var img image.Image = m writeImage(w, &img) } func writeImage(w http.ResponseWriter, img *image.Image) { buffer := new(bytes.Buffer) if err := jpeg.Encode(buffer, *img, nil); err != nil { log.Println("unable to encode image.") } w.Header().Set("Content-Type", "image/jpeg") w.Header().Set("Content-Length", strconv.Itoa(len(buffer.Bytes()))) if _, err := w.Write(buffer.Bytes()); err != nil { log.Println("unable to write image.") } } func writeImageWithTemplate(w http.ResponseWriter, img *image.Image) { buffer := new(bytes.Buffer) if err := jpeg.Encode(buffer, *img, nil); err != nil { log.Println("unable to encode image.") } var ImageTemplate string = `<!DOCTYPE html> <html lang="en"><head></head> <body><img src="data:image/jpg;base64,{{.Image}}"></body>` str := base64.StdEncoding.EncodeToString(buffer.Bytes()) if tmpl, err := template.New("image").Parse(ImageTemplate); err != nil { log.Println("unable to parse image template.") } else { data := map[string]interface{}{"Image": str} if err = tmpl.Execute(w, data); err != nil { log.Println("unable to execute template.") } } }
golang生成1像素点图像；
参考：https://www.sanarias.com/blog/1214PlayingwithimagesinHTTPresponseingolang