Rendering Image in Grails that lives in the file system

ImageDisplayController.groovy

package org.uris.potholes.web.controllers

import javax.imageio.ImageIO
import java.awt.image.BufferedImage


class ImageDisplayController {
    private final static String PICTURES_DIR = "/usr/local/code/grails/potholes/pictures"

    def renderImage() {
        String imageName = params.imageName
        File imageFile = new File("${PICTURES_DIR}/${imageName}")
        BufferedImage originalImage = ImageIO.read(imageFile)
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream()
        ImageIO.write(originalImage, "jpg", outputStream)
        byte[] imageInByte = outputStream.toByteArray()
        response.setHeader("Content-Length", imageInByte.length.toString())
        response.contentType = "image/jpg"
        response.outputStream << imageInByte
        response.outputStream.flush()
    }
}