ruby 上传文件

def upload_file
  
    if !params['upload_file'].nil?
      file = params['upload_file']
     
      file_upload(file)

    end
  end

  def file_upload(upload)
  
    begin
      FileUtils.mkpath(upload_path) unless File.directory?(upload_path)
      if upload.kind_of?(StringIO)
        upload.rewind
      end

      orig_name = upload.original_filename
      base_name = File.basename(orig_name, ".*")    # 取得文件名字
      ext_name = File.extname(orig_name) # 取得文件扩展名
      # 重命名
      file_name = base_name  + '_' + Time.now.strftime("%y%m%d")  + ext_name
      # 将文件写入磁盘
      File.open(upload_path(file_name), "wb") { |f| f.write(upload.read) }

    rescue
      raise
    end

    redirect_to '/service/upload_file'

  end

  # 生成绝对路径
  def upload_path(file_name = nil)
    "#{RAILS_ROOT}/public/tagfiles/#{file_name.nil? ? '' : file_name}"
  end