Rails文件上传

1，upload_controller.rb

class UploadController < ApplicationController

   before_filter :configure_charsets

   def configure_charsets
    @headers["Content-Type"]="text/html;charset=utf-8"
  end      

  def upload
  end

  def uploadFile(file)
    if !file.original_filename.empty?
      @filename=getFileName(file.original_filename) 
      File.open("#{RAILS_ROOT}/public/upload/#{@filename}", "wb") do |f|
      f.write(file.read)
      end
      return @filename
    end
  end

  def getFileName(filename)
    if !filename.nil?
      Time.now.strftime("%Y_%m_%d_%H_%M_%S") + '_' + filename
    end
  end

  def save
    unless request.get?
      if filename=uploadFile(params[:file]['file'])
        render :text=>filename
      end
    end
  end 

end

2，upload.rhtml

<h1>Upload File</h1>

<%= form_tag({:action => 'save'}, :multipart => true) %>
Upload your file: <%= file_field("file", "file") %>
<br/>
<%= submit_tag("Upload file") %>
<%= end_form_tag %>