rails实现多文件的上传

实现把文件上传到服务器,文件名/文件大小/文件的描述   上传到数据库


Application.rb代码如下:

# Filters added to this controller apply to all controllers in the application.

# Likewise, all the methods added will be available for all controllers.

 

class ApplicationController < ActionController::Base

  # Pick a unique cookie name to distinguish our session data from others'

  session :session_key => '_uploadF_session_id'    

   

  def uploadFile(file)

     if !file.original_filename.empty?

      @filename=getFileName(file.original_filename)

      File.open("#{RAILS_ROOT}/public/files/#{@filename}", "wb") do |f|

      f.write(file.read)

      end

     return @filename 

    end

  end

 

  def getFileName(filename)  

     if !filename.nil?  

        return filename

     end     

  end

  

  def savefiles(file,description)

    @filename=getFileName(file.original_filename)

    @filesize=getFileName(file.length)

    @uploadfile = Uploadfile.new

    @uploadfile.filename=@filename

    @uploadfile.filesize=@filesize/1024

    @uploadfile.description=description

    @uploadfile.save

  end  

end

upload_controller.rb代码如下:

class UploadController < ApplicationController

 def upload

   @uploadfile = Uploadfile.new

   unless request.get?  

     i=params[:file].size

     for num in (0..i-1)

      if  filename=uploadFile(params[:file][num])

      savefiles(params[:file][num],params[:uploadfile][num])

      end

     end

   end

   end

end

  

upload.rhtml代码:

<script language="javascript">

HTMLElement.prototype.insertAdjacentHTML=function(where, html)

{

  var e=this.ownerDocument.createRange();

  e.setStartBefore(this);

  e=e.createContextualFragment(html);

  switch (where)

  {

    case 'beforeBegin': this.parentNode.insertBefore(e, this);break;

    case 'afterBegin': this.insertBefore(e, this.firstChild); break;

    case 'beforeEnd': this.appendChild(e); break;

    case 'afterEnd':

      if(!this.nextSibling) this.parentNode.appendChild(e);

      else this.parentNode.insertBefore(e, this.nextSibling); break;

  }

}

function addText()       {

    var str ='<input id="file1" name="file[]" size="30" type="file" /></br> <input type="text" id="uploadfile_description" name="uploadfile[]"></br>';            

    document.getElementById('MyFile').insertAdjacentHTML("beforeEnd",str);    

}

</script> 

<%=start_form_tag ({:action=>"upload"},:multipart=>true )%>

  <div id="MyFile">

    <input id="file" name="file[]" size="30" type="file" /></br>

    <input type="text" id="uploadfile_description" name="uploadfile[]"></br>

  </div>

  <input type="button" value="add" onclick="addText()"/>

  <input style="cursor:pointer" type="submit" value="upload"/>

<%=end_form_tag%>