ror上传图片

controller：

def update
    @mobile_order_bill = MobileOrderBill.find(params[:id])
    if !params[:mobile_order_bill][:invoice_sweeping_pieces].blank?
      params[:mobile_order_bill][:invoice_sweeping_pieces] = upload("图片",params[:mobile_order_bill][:invoice_sweeping_pieces],params[:id])
      system("cd #{Rails.root.to_s}/public/upload/invoice && rm -rf #{@mobile_order_bill.invoice_sweeping_pieces}")
    end
    @mobile_order_bill.update_attributes(params[:mobile_order_bill])

end

private

def upload(key,value,id)
    begin
      unless request.get?
        if value.blank?
          flash[:notice] = "请选择一个#{key}"
          respond_to do |format|
            format.html { redirect_to "/mobile_order_bills/#{id},all_edit/edit/" }
          end
          return
        else
          file_name = file(value)
          unless file_name.blank?
            flash[:notice] = "#{key}上传成功"
            return file_name
          else
            flash[:notice] = "#{key}上传失败"
            respond_to do |format|
              format.html { redirect_to "/mobile_order_bills/#{id},all_edit/edit/" }
            end
          end
        end
      end
    rescue => e
      p e
    end
  end

  def file(file)
    if !file.original_filename.empty?
      @filename= getfilename(file.original_filename)
      #设置目录路径，如果目录不存在，生成新目录
      FileUtils.mkdir("#{RAILS_ROOT}/public/upload/invoice") unless File.exist?("#{RAILS_ROOT}/public/upload/invoice")
      #写入文件
      File.open("#{RAILS_ROOT}/public/upload/invoice/#{@filename}", "wb") do |f|
        f.write(file.read)
      end
      return @filename
    end
  end

  #文件名
  def getfilename(filename)
    if !filename.nil?
      Time.now.strftime("%Y_%m_%d_%H_%M_%S") + '_' +filename.split(' ').to_s
    end
  end

 

 

html:

<%= form_for @mobile_order_bill,:html =>{:multipart => true} do |f| %> <!-- 文件上传要开启multipart -->

　　<div class="row2">
              <label class="item_title">上传图片：</label>
              <%= f.file_field :invoice_sweeping_pieces, {:id => "bank_license"} %>

　　</div>

<%end%>

 

<%= form_tag "/agent_infos/create" ,:multipart => true do %>

　　<div class="row2">
          <label class="item_title">上传图片：</label>
          <%= file_field :agent_info,:business_license, {:id => "business_license"} %>
      </div>

<%end%>

 

<%unless @mobile_order_bill.invoice_sweeping_pieces.blank?%>
　　<div class="xq_title"><p>图片展示</p></div>
        <div class="row2">

　　　　<div class="item_img">

　　　　　　<img src="/<%= File.join('upload/invoice' , @mobile_order_bill.invoice_sweeping_pieces) %>" style=" width:300px; height:240px;" />

　　　　</div>
        </div>
<%end%>