Grailsでファイルのダウンロード

gistfile1.txt

class FileStore {
  String filename
  FileContent content
  String contentType

  public String toString() { "$id:$filename" }

  static mapping = {
    content lazy: true
  }
}

------
class FileContent {
  byte[] image
  static def belongsTo = [fileStore: FileStore]
}

------
import javax.mail.internet.MimeUtility

class FileStoreController {
  def show = {
    def fileStore = FileStore.get(params.id)

    if (request.getHeader('User-Agent') =~ /^MSIE/) {
      response.setHeader('Content-disposition',
                         "attachment; filename=${MimeUtility.encodeWord(fileStore.filename, 'ISO-2022-JP', 'B')}")
    } else {
      response.setHeader('Content-disposition',
                         "attachment; filename=${URLEncoder.encode(fileStore.filename, 'UTF-8')}")
    }
    response.contentType = fileStore.contentType
    response.outputStream << fileStore.content.image
  }
}