Golang Implement picture Scaling server

This is a creation in Article, where the information may have evolved or changed.

Test address

Http://127.0.0.1:6789/1000/789.png

Http://127.0.0.1:6789/400/789.png

The middle number is the picture size

Package Main

Import(

  "FMT"

  "Graphics"

  "image"

  "Image/png"

  "Log"

  "Net/http"

  "OS"

  "StrConv"

  "strings"

)

FuncMain (){

 http. Handlefunc("/",doimagehandler)

 http. Listenandserve("127.0.0.1:6789",nil)

}
func    doimagehandler ( w  http  Responsewriter   R   *  http.  Request)    { 
      fmt Printf (  " %q  \n   "     strings Split ( r Url Path    "/"   
      url  :=    strings . Split ( r Url Path    "/"  )  
  if len (URL)! = 3  {
  return
    }
 newdx,uerr: =strconv. Atoi(url[1])
  ifuerr! = Nil{ 
 log. Fatal(uerr)
    }
 src,err: =loadimage(url[2 ])
 bound: =src. Bounds()
 DX: =bound. Dx()
 dy: =bound. Dy()
  if Err! =Nil {
 log. Fatal(err)
    }
  //  thumbnail size
 DST: =image. Newrgba(image. Rect(0,0,newdx,  NEWDX*dy/dx))
  //  generate thumbnails, equal scale
 err=graphics. Scale(DST,src)
  if Err! =Nil {
 log. Fatal(err)
    }
 Header: =w. Header()
 header. Add("Content-type","Image/jpeg")
 png. Encode(w,DST)
}

 Load Imagedecodesan Image    from afile of image. 

Funcloadimage (pathstring)(img  Image. Image,errerror){

 file,err: =os. Open(path)

  if Err! =Nil {

  return

    }

  deferfile. Close()

 img,_,err=image. Decode(file)

  return

}

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