rails开发利器：视频播放插件plugin（如何开发一个简单的插件）

本文链接：https://blog.youkuaiyun.com/hexudong08/article/details/6951715

本文介绍了如何在Rails 2.3.8环境下开发一个名为video_player的插件，包括创建helper来展示Flash视频播放器，区分直播和非直播模式，并通过rake任务自动复制资源文件到Public目录。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

For:　rails2.3.8
因为我的项目是基于rails2.3.8的，以后在做rails3.0的

plugin的名称是 video_player, 新建plugin

ruby  script/generate plugin video_player --with-generator

重新组织我的文件目录
新建video_player和rails文件夹，新建rails/init.rb文件
```
mkdir rails
mkdir lib/video_player
touch rails/init.rb
```
修改 rails/init.rb
```
require 'video_player'
```
删除多余的文件
```
 rm -rf init.rb install.rb
```
整理一下我的思路：
4.1 我需要新建一个helper,用于显示flash video, 而且能分直播和非直播的模式
4.2 我需要新建一个rake task,用于资源的复制

开发helper方法
新建lib/app/helpers/video_player_helper.rb文件

module VideoPlayerHelper


   def video_player(url_bad='',live=true,width=500, height=400)
    flash_url_bad = "http://#{request.env["HTTP_HOST"]}/player.swf"
    flash_url = flash_url_bad
    player = "<object width='#{width}' height='#{height}'>"
    player += '<param value="transparent" name="wmode"></param>'
    player +=  "<param value='#{flash_url}' name='movie'></param>"
    url = URI.escape(url_bad, Regexp.new("[^#{URI::PATTERN::UNRESERVED}]"))
    if live
      player += "<param value='src=#{url}&streamType=live&autoRewind=true&autoPlay=true&bufferingOverlay=false&autoDynamicStreamSwitch=false&optimizeInitialIndex=false&bufferTime=0&initialBufferTime=0&expandedBufferTime=0&dynamicStreamBufferTime=0&dvrBufferTime=0&dvrDynamicStreamingBufferTime=0&liveBufferTime=0&liveDynamicStreamingBufferTime=0&minContinuousPlaybackTime=0' name='flashvars'> </param> "
    else
      player += "<param value='src=#{url}&autoRewind=true&autoPlay=true' name='flashvars'> </param>"
    end

    player += "<param value='true' name='allowFullScreen'></param>
            <param value='always' name='allowscriptaccess'></param>
            <embed width='#{width}' height='#{height}' wmode='transparent'"
    if live
      player += "flashvars='src=#{url}&streamType=live&autoRewind=true&autoPlay=true&bufferingOverlay=false&autoDynamicStreamSwitch=false&optimizeInitialIndex=false&bufferTime=0&initialBufferTime=0&expandedBufferTime=0&dynamicStreamBufferTime=0&dvrBufferTime=0&dvrDynamicStreamingBufferTime=0&liveBufferTime=0&liveDynamicStreamingBufferTime=0&minContinuousPlaybackTime=0'"
    else
      player += "flashvars='src=#{url}&autoRewind=true&autoPlay=true'"
    end

    player += " allowfullscreen='true'  allowscriptaccess='always'  type='application/x-shockwave-flash'
        src='#{flash_url}'> </embed></object>"
    return player
  end

end

修改video_player.rb文件，将helper加入application中

%w{ helpers }.each do |dir|

  path = File.join(File.dirname(__FILE__), 'app', dir)
  $LOAD_PATH << path
  ActiveSupport::Dependencies.load_paths << path
  ActiveSupport::Dependencies.load_once_paths.delete(path)
end 

if defined?(ActionView::Base)
  ActionView::Base.send :include, VideoPlayerHelper
end

新建一个rake,用于复制player.swf到Public目录

require 'fileutils'
include FileUtils::Verbose
desc "copy player.swf to public dir"
task :copy_video_player do
  play_swf = File.join(File.dirname(__FILE__),"player.swf")
  cp(play_swf, File.join(RAILS_ROOT, "public"))
end

代码地址
https://github.com/chucai/videoplayer