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设计开发实效 Web2.0 应用程序
1.
设计开发实效 Web2.0 应用程序 朱可
(@shawnzhu) 软件工程师 IBM 中国开发实验室新兴技术中心
2.
内容概况 从实际出发看 Web2.0 应用程序开发 •
趋势和主题 • 从核心问题入手 • 实用主义观点 • 工具和技能 2
3.
Web2.0: 2010 • 社会网络与社会化游戏 •
在线Web应用程序商店 • 微博客 • 在线商店和在线支付 • 基于位置和地理信息的应用 • 互联网电视、在线电影和视频 Copyright 2010 © IBM Corporation 3
4.
Web2.0 开发的核心问题 •
更多的用户数量 • 更多的在线任务 • 越来越多的相互联系的数据 • 安全威胁与隐私保护 • 新的客户端平台 4
5.
Web2.0 开发新主题 基于Web的开放编程接口
大规模数据分析 云计算 移劢Web 5
6.
Web 应用程序之实用主义观点 •
用户体验 (User experience) • 成本 (Costs) • 系统复杂度 (System complexity) • 可测试的系统 (Testable system) • 行劢敏捷 (Do things agile) 6
7.
用户体验
7
8.
“It's the Customer,
Stupid!” • 简单易用的用户体验设计 • 清晰的信息架构 • 多重访问渠道 • 浏览器 移劢设备同步应用 API 访问 (如 OpenSocial) 8 (http://thepcsecurity.com/use-multiple-browsers-to-ensure-internet-security/) (http://en.wikipedia.org/wiki/OpenSocial)
9.
简单易用的用户体验设计 保持一致的 UI 模型 •
Yahoo! Design library • Dijit from Dojo toolkit • jQuery widget (http://developer.yahoo.com/ypatterns/selection/autocomplete.html) 提供反馈信息 保持简洁 9 (http://ajaxian.com/archives/dissecting -dijit-dojo-widgets)
10.
用户体验设计之 IBM OneUI <link
rel="stylesheet" href="/static/css/core.css" type="text/css"/> <link rel="stylesheet" href="/static/css/defaultTheme.css" type= "text/css"/> … <body class="lotusui"> … 描述 CSS 和 HTML 结构 • 通用布局 • UI 组件 • 主题 10
11.
清晰的信息架构设计 Logo
Category Title Navigation tab Tips & wizard Filters Common links Footer 11
12.
信息架构设计之HTML文档参考 <body> <header><nav><!--
navigation --></nav></header> <aside><!-– filters in tag cloud --></aside> <div> <section><!-– tips --></section> <section><!–- content list --></section> <!–- other sections --> </div> <footer><!-- declaration --></footer> </body> 12
13.
通过良好的架构管理系统复杂 度,控制运营成本
13
14.
实效Web2.0应用程序架构 • 应用设计原则分离关注点 –
会话(session)信息的保存 负载平衡器 – 事务与数据一致性检查 – 可用性 Web应用 Web应用 – 规模化 Web容器 Web容器 – 数据存储 缓存 – 可管理性 主数据库 从数据库 典型Web2.0应用程序架构参考 14
15.
使用云计算基础设施部署 Web 应用 •
弹性基础设施 Public Network • 按需支付 • 高可伸缩性 Amazon Elastic • 海量数据存储 Load Balancing • 管理与监视能力 WebSphere sMash Amazon S3 On Amazon EC2 (Elastic CDN) Amazon RDB Amazon SimpleDB WebSphere sMash + Amazon Web Services 15
16.
在云计算平台上开发 Web 应用 使用方便但选择有限 •
Google AppEngine: Python or Java • Sina AppEngine: PHP 按使用率付费 16
17.
可测试的系统 “Test when possible.”
17
18.
测试 Web2.0 应用程序 “Test
twice, write once.” 普及单元测试 • JUnit, Ruby ‘test/unit’, Python ‘unittest’, PHPT 功能测试 • django.test.client.Client • curl • java.net.URLConnection 性能测试 • Apache JMeter, LoadRunner 集成测试 • Selenium 18
19.
工具和技能 •
新兴编程语言 • 云计算技术 • 新兴数据库技术 • 可复用的组件服务 • OpenID, Online Map, Google search, 在线 相册, 在线文件分享,即时通信服务(XMPP, Wave) 19
20.
选择数据库 • 关系型数据库
• 最为常用,面向结构化数据的查询和编辑 • 非关系型数据库(NoSQL) • 列数据库: HBase, Cassandra • 键值对数据库: CouchDB, MongoDB, AWS SimpleDB • 内容数据库: JCR, AWS S3 提示: 只有在 SQL 数据库无法满足功能性需要时,再选择 NoSQL 数据库 20
21.
行劢敏捷
21
22.
敏捷风格的开发过程 原则 • 尽早、经常地交付可用的软件 • 保持简单 方法论 •
DRY – Don’t repeat your self • 尽可能多地测试 • 代码重构与设计重构 • 从错误和失败中学习 22
23.
Web2.0 应用程序的安全 提防安全漏洞保护 Web
应用 • XSS (跨站脚本) • CSRF (跨站请求伪造) 使用开放安全协议保护用户隐私 • 使用 SSL 加密通信传输 • 使用 OpenID 管理用户身份信息 • 使用 OAuth 与第三方服务交换数据 23
24.
小结 • 简单易用的用户体验设计 • 通过良好的架构管理系统复杂度,控制运营成本 •
构建可测试的系统 • 把握敏捷行劢的原则和方法 • 注重应用程序安全和用户隐私 24
25.
参考信息 • Yahoo! Design
Library • Amazon Web Services • IBM OneUI • Dojo toolkit • Projectzero 开发社区 • NoSQL 25
26.
© IBM Corporation
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