Grails：画像をアップロードして，サムネイル作成。

gistfile1.txt

grails install-plugin http://www.arquetipos.co.cr/blog/files/grails-image-tools-1.0.3.zip

class Picture {
  byte[] imagefile
}

def save = {
  def downloadedFile = request.getFile('imagefile')
  def pictureInstance = new Picture(params)
  def imageTool = new ImageTool()

  if (downloadedFile && pictureInstance.save()) {
    String imagepath = "${grailsAttributes.applicationContext.getResource('images/').file}${File.separatorChar}${pictureInstance.id}.jpg"
    downloadedFile.transferTo(new File(imagepath))

    imageTool.load(imagepath)
    imageTool.thumbnail(140)
    imageTool.writeResult(imagepath, "JPEG")
    imageTool.square()
    flash.message = "Picture ${pictureInstance.id} created(${imagepath})"
    redirect(action: show, id: pictureInstance.id)
  }
  else {
    render(view: 'create', model: [pictureInstance: pictureInstance])
  }
}

<td><img src="${createLinkTo(dir:'images', file:pictureInstance.id+'.jpg')}"/></td>