Model中的部分:
class SystemUploadfile < ActiveRecord::Base Region = ["北京","西安"] File_extname = [".rar",".7z",".zip"] File_target = "public/files" cattr_accessor :per_page @@per_page = 10 validates :title,:presence=>true validates :area,:presence=>true validates :file_name,:presence=>true validates :file_url,:presence => true validates_format_of :file_url, :with => %r{/.(rar|zip|7z)}i def set_file_values(file_url,file_name) self.file_url = file_url self.file_name = file_name end def add_download_count self.counts += 1 self.save end def get_file_path return SystemUploadfile::File_target+"/"+ self.file_url end #删除文件 def delete_file file_path = File.join(Rails.root,SystemUploadfile::File_target,self.file_url) if File.exist?(file_path) File.delete(file_path) end end end
Action中的部分如下：
class SystemUploadfilesController < ApplicationController def index @search = SystemUploadfile.search(params[:search]).order('id') @system_uploadfiles = @search.paginate(:page => params[:page],:per_page => SystemUploadfile.per_page) end def new @system_uploadfile = SystemUploadfile.new respond_to do |format| format.html # new.html.erb format.xml { render :xml => @system_uploadfile } end end def create #如果说什么也没有接收到 if request.get? @system_uploadfile = SystemUploadfile.new flash.now[:notice] = "文件上传失败" render :action => "new" else @system_uploadfile = SystemUploadfile.new(params[:system_uploadfile]) #获取上传的文件 uploaded_file = params[:system_uploadfile][:file_url] if_succ,filepath = upload_file(uploaded_file,SystemUploadfile::File_extname,SystemUploadfile::File_target) if if_succ @system_uploadfile.set_file_values(filepath, uploaded_file.original_filename) if @system_uploadfile.save redirect_to system_uploadfiles_path,:notice => "文件上传成功" else render :action => "new" end else flash.now[:notice] = filepath render :action => "new" end end end def download @system_uploadfile = SystemUploadfile.find_by_id(params[:id]) if @system_uploadfile == nil redirect_to system_uploadfiles_path, :notice => '没有记录，下载失败！' else file_path = @system_uploadfile.get_file_path if File.exist?(file_path) #@system_uploadfile.add_download_count #send_file file_path,:disposition => 'inline' io = File.open(file_path) io.binmode send_data(io.read,:filename => @system_uploadfile.file_name,:disposition => 'attachment') io.close else redirect_to system_uploadfiles_path, :notice => '文件不存在，下载失败！' end end end def destroy @system_uploadfile = SystemUploadfile.find_by_id(params[:id]) if @system_uploadfile == nil flash.now[:notice] = '该记录已被删除' redirect_to system_uploadfiles_path else @system_uploadfile.delete_file @system_uploadfile.destroy respond_to do |format| format.html { redirect_to(system_uploadfiles_path) } format.xml { head :ok } end end end end Form：html部分
<% form_for( @system_uploadfile,:html=>{:multipart => true}) do |f| -%> <%= f.label :title, "标题：" %> <br /> <%= f.text_field :title%> <em style="color:red;"><%= f.error_message_on :title %></em> <br /> <%= f.label "区域" %> <%= f.select :area,options_for_select(SystemUploadfile::Region) %> <br></br> 选择上传文件:<br/> <%= file_field(:system_uploadfile, :file_url)%> <em style="color:red;"><%= f.error_message_on :file_url %></em> <br/> <%= f.submit "提交", :disable_with => '提交中...'%> <% end -%>
程序中用到的一个方法：
def upload_file(file,extname,target_dir) if file.nil? || file.original_filename.empty? return false,"空文件或者文件名错误" else timenow = Time.now filename = file.original_filename #file的名字 fileloadname = timenow.strftime("%d%H%M%S")+filename #保存在文件夹下面的上传文件的名称 if extname.include?(File.extname(filename).downcase) #创建目录 #首先获得当前项目所在的目录+文件夹所在的目录 path = Rails.root.join(target_dir,timenow.year.to_s,timenow.month.to_s) #生成目录 FileUtils.makedirs(path) File.open(File.join(path,fileloadname),"wb") do |f| f.write(file.read) return true,File.join(timenow.year.to_s,timenow.month.to_s,fileloadname) end else return false,"必须是#{extname}类型的文件" end end end
