GoLang缩略图+beego项目

import (       "Server_sevenstudio/controllers"       "github.com/astaxie/beego"       "mime/multipart"       "os"       "time"       "strconv"       "strings"       "math/rand"       "crypto/md5"       "encoding/hex"       "regexp"       "image"       "code.google.com/p/graphics-go/graphics"       _"image/jpeg"       "image/png"       "fmt")

f,h,err_img := this.GetFile("avatar")if err_img == nil{       //定义原图,中图,大图路径       var filepath  = ""       var filepath_m  = ""       var filepath_s  = ""       //定义图片的name属性       var par_name = "avatar"       err,filepath,filepath_m,filepath_s = this.SaveFile(f,h,par_name)

....

//上传图片,返回值为原图及缩略图路径func (this *BaseApiController) SaveFile(f multipart.File,h *multipart.FileHeader,par_name string)(err error,l string,m string,s string){       defer f.Close()       now := time.Now()       upload_path := beego.AppConfig.String("uploadpath")       dir := upload_path+ strconv.Itoa(now.Year()) + "-" + strconv.Itoa(int(now.Month())) + "/" + strconv.Itoa(now.Day())       dirf := strconv.Itoa(now.Year()) + "-" + strconv.Itoa(int(now.Month())) + "/" + strconv.Itoa(now.Day())+ "/"       err = os.MkdirAll(dir, 0755)       if err != nil {              return       }       filename := h.Filename       newname := this.FormatFileName(filename)       imgpath := dir+"/"+newname       err = this.SaveToFile(par_name, imgpath)       if err != nil{              return       }else {              image,_ := beego.AppConfig.GetSection("image")              width_m,_ := strconv.Atoi(image["width_m"])              width_s,_ := strconv.Atoi(image["width_s"])              height_m,_ := strconv.Atoi(image["height_m"])              height_s,_ := strconv.Atoi(image["height_s"])              err = MakeMilThumb(imgpath,width_m,height_m)              err = MakeSmallThumb(imgpath,width_s,height_s)              if err != nil {                     return              }else {                     l = dirf+newname                     m = dirf+strings.Replace(newname, "_l.", "_m.",1)                     s = dirf+strings.Replace(newname, "_l.", "_s.",1)                     return err,l,m,s              }       }}//middle imagefunc MakeMilThumb(orgpath string,width int,height int) error {       src, err := LoadImage(orgpath)       if err != nil {              return err       }       dst := image.NewRGBA(image.Rect(0, 0, width, height))       err = graphics.Scale(dst, src)   //缩小图片       if err != nil {              return err       }       filepath_m := strings.Replace(orgpath, "_l.", "_m.",1)       err = SaveImage(filepath_m, dst)       return err}//small imagefunc MakeSmallThumb(orgpath string,width int,height int) error {       src, err := LoadImage(orgpath)       if err != nil {              return err       }       dst := image.NewRGBA(image.Rect(0, 0, width, height))       err = graphics.Scale(dst, src)   //缩小图片       if err != nil {              return err       }       filepath_s := strings.Replace(orgpath, "_l.", "_s.",1)       err = SaveImage(filepath_s, dst)       return err}//读取文件func LoadImage(path string) (img image.Image, err error) {       file, err := os.Open(path)       if err != nil {              return       }       defer file.Close()       img, _, err = image.Decode(file) //解码图片       fmt.Println(err)       return}//保存文件func SaveImage(path string, img image.Image) (err error) {       imgfile, err := os.Create(path)       defer imgfile.Close()       err = png.Encode(imgfile, img)   //编码图片       return}//重新生成文件名func (this *BaseApiController)FormatFileName(filename string) string {       filepath := strings.Split(filename, ".")       t := time.Now().UnixNano()       rndNum := rand.Int63()       t1 :=  this.Md5(strconv.FormatInt(t,10)+strconv.FormatInt(rndNum,10))       newname := t1+"_l."+filepath[1]       return newname}