ruby on 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%>