rails 文件下载功能

?

controller:class DownController < ApplicationController     def down_file    send_file "public/files/"+params[:filename] unless params[:filename].blank?     end  end view:     <%= link_to "下载文件", :action => "down_file", :filename => "down.txt" %>

?

或者直接放置于public中

<%= link_to "下载文件", "1.xls" %>