package main import (     "fmt"     "github.com/nfnt/resize"     "image"     "image/draw"     "image/jpeg"     "image/png"     "io/ioutil"     "log"     "math/rand"     "os"     "runtime"     "strconv"     "strings"     "time" ) func main() {     runtime.GOMAXPROCS(runtime.NumCPU())     cmd("data/")     fmt.Println("OK!") } // 执行操作 func cmd(path string) {     files, _ := ioutil.ReadDir(path)     for _, file := range files {         if file.IsDir() {             fmt.Println("目录" + file.Name())             cmd(path + file.Name() + "/")         } else {             if strings.Contains(strings.ToLower(file.Name()), ".jpg") {                 // 随机名称                 to := path + random_name() + ".jpg"                 origin := path + file.Name()                 fmt.Println("正在处理" + origin + ">>>" + to)                 cmd_resize(origin, 2048, 0, to)                 defer os.Remove(origin)             }         }     } } // 改变大小 func cmd_resize(file string, width uint, height uint, to string) {     // 打开图片并解码     file_origin, _ := os.Open(file)     origin, _ := jpeg.Decode(file_origin)     defer file_origin.Close()     canvas := resize.Resize(width, height, origin, resize.Lanczos3)     file_out, err := os.Create(to)     if err != nil {         log.Fatal(err)     }     defer file_out.Close()     jpeg.Encode(file_out, canvas, &jpeg.Options{80})     // cmd_watermark(to, strings.Replace(to, ".jpg", "@big.jpg", 1))     cmd_thumbnail(to, 480, 360, strings.Replace(to, ".jpg", "@small.jpg", 1)) } func cmd_thumbnail(file string, width uint, height uint, to string) {     // 打开图片并解码     file_origin, _ := os.Open(file)     origin, _ := jpeg.Decode(file_origin)     defer file_origin.Close()     canvas := resize.Thumbnail(width, height, origin, resize.Lanczos3)     file_out, err := os.Create(to)     if err != nil {         log.Fatal(err)     }     defer file_out.Close()     jpeg.Encode(file_out, canvas, &jpeg.Options{80}) } // 水印 func cmd_watermark(file string, to string) {     // 打开图片并解码     file_origin, _ := os.Open(file)     origin, _ := jpeg.Decode(file_origin)     defer file_origin.Close()     // 打开水印图并解码     file_watermark, _ := os.Open("watermark.png")     watermark, _ := png.Decode(file_watermark)     defer file_watermark.Close()     //原始图界限     origin_size := origin.Bounds()     //创建新图层     canvas := image.NewNRGBA(origin_size)     // 贴原始图     draw.Draw(canvas, origin_size, origin, image.ZP, draw.Src)     // 贴水印图     draw.Draw(canvas, watermark.Bounds().Add(image.Pt(30, 30)), watermark, image.ZP, draw.Over)     //生成新图片     create_image, _ := os.Create(to)     jpeg.Encode(create_image, canvas, &jpeg.Options{95})     defer create_image.Close() } // 随机生成文件名 func random_name() string {     rand.Seed(time.Now().UnixNano())     return strconv.Itoa(rand.Int()) }