Adding and Resizing Images with Grails
Here is a quick post on how to upload images within your Grails project to your file system(rather than your database). It seems simple enough, but I ran into a few snags as I was working on one of my projects. Just wanted to provided a working example for those that are entering the Grails territory for the first time. Happy Coding!
I am using the imageTools plugin which you can read more about here
NOTE: The imageTools plugin has been criticized for its low quality of output. ImageMagick may be a better fit for you project(s). My particular project didn’t call for high quality pictures. A quick google search for “imagemagick for grails” should get you started on your way.
I am using version 1.0.3 in the example below
to install, I ran the following command from my grails application’s root directory
grails install-plugin http://www.arquetipos.co.cr/blog/files/grails-image-tools-1.0.3.zip
Domain-Class
class Picture {
byte[] imagefile
//Any other stuff you want to track
}
Controller Code for Saving an image
def save = {
def downloadedfile = request.getFile('imagefile')
def pictureInstance = new Picture(params)
def imageTool = new ImageTool()
if(downloadedfile && pictureInstance.save()){
String imagepath = grailsAttributes.getApplicationContext().getResource("images/").getFile().toString() + 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 ${pictureInstance.id} created"
redirect(action:show,id:pictureInstance.id)
}
else {
render(view:'create',model:[pictureInstance:pictureInstance])
}
}
Code for displaying the image in both the ’show’ and ‘list’ views
<td><img src="${createLinkTo(dir:'images', file: pictureInstance.id+'.jpg' )}" /> </td>
Nice post Juan. I heard this post mentioned on the latest (February 1, 2009) Grails Podcast while driving to work this morning. That’s awesome.
Thanks Roger, I am a little behind on the podcast. I am glad that this post is useful to others