grails display images in folder - image

Question

I'm trying to do a Grails webapp and now I'm trying to display all images in a folder.
To do that I have the following:
def display(){
def dir = new File("/tmp/images")
def list = []
dir.eachFileRecurse() { file ->
def avatarFilePath = new File(file.path)
response.setContentType("application/jpg")
OutputStream out = response.getOutputStream();
out.write(avatarFilePath.bytes);
out.close();
}
}
So using the code above I'm displaying one image using:
<img class="thumbnail" src='${createLink(controller: "images", action: "display")}' />
Using this code, I'm displaying one image.
How do I display all images in that folder?
Do I need to build a list? A list of what? A list of outputstream?
In that case, what should I put in my gsp file?

Answer 1

If the images folder was inside the app structure you could just create links to the image directly. In this case I think you need a controller action that output the contents of one file, and another action that get's the list of the images and request the file content.
class MyController {
private static final File IMAGES_DIR = new File('/tmp/images')
//get the list of files, to create links in the view
def listImages() {
[images: IMAGES_DIR.listFiles()]
}
//get the content of a image
def displayImage() {
File image = new File(IMAGES_DIR.getAbsoluteFilePath() + File.separator + params.img)
if(!image.exists()) {
response.status = 404
} else {
response.setContentType("application/jpg")
OutputStream out = response.getOutputStream();
out.write(avatarFilePath.bytes);
out.close();
}
}
}
And your gsp could do something like
<g:each in="${images}" var="img">
<img class="thumbnail" src='${createLink(controller: "myController", action: "displayImage", params:[img: img.name])}' />
</g:each>
P.S: the code is not tested, may need some adjust.