�??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#x65E5;&#x672C;&#x7CBE;&#x54C1;&#x4E8C;&#x533A;&#x2C;&#x4E9A;&#x6D32;&#x6210;&#x4EBA;&#x31;&#x32;&#x33;&#x34;&#x2C;&#x6DF1;&#x591C;&#x798F;&#x5229;&#x5728;&#x7EBF;&#x89C6;&#x9891;</title><link>http://www.aygfsteel.com/qixiangnj/category/24865.html</link><description>&lt;strong&gt;生命不息�Q�拼搏不止�?lt;/strong&gt;</description><language>zh-cn</language><lastBuildDate>Sun, 26 Aug 2007 17:28:00 GMT</lastBuildDate><pubDate>Sun, 26 Aug 2007 17:28:00 GMT</pubDate><ttl>60</ttl><item><title>【J2EE核心模式】——表现层设计考虑和不佛_���?/title><link>http://www.aygfsteel.com/qixiangnj/archive/2007/08/25/139290.html</link><dc:creator>Thomas</dc:creator><author>Thomas</author><pubDate>Sat, 25 Aug 2007 10:49:00 GMT</pubDate><guid>http://www.aygfsteel.com/qixiangnj/archive/2007/08/25/139290.html</guid><wfw:comment>http://www.aygfsteel.com/qixiangnj/comments/139290.html</wfw:comment><comments>http://www.aygfsteel.com/qixiangnj/archive/2007/08/25/139290.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/qixiangnj/comments/commentRss/139290.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/qixiangnj/services/trackbacks/139290.html</trackback:ping><description><![CDATA[<span style="font-weight: bold;">表现层设计考虑<br>会话���理</span><br>&nbsp; <span style="font-weight: bold;">在客��L��保存会话状�?/span><br>&nbsp; 优点�Q?br>&nbsp; ①实现容�?br>&nbsp; ②保存状态比较少�Ӟ��效果�?br>&nbsp; ③需要多台Server实现负蝲均衡�Ӟ��无需在Server间复制会话状态�?br><br>&nbsp; 实现�{�略�Q?br>&nbsp; ①HTML隐藏字段<br>&nbsp; ②HTTP Cookie<br>&nbsp; ③直接放�q�URL�?br><br>&nbsp; 1. HTML隐藏字段的缺点：<br>&nbsp;&nbsp;&nbsp; ①需保存状态较多时�Q�缺点尤其明显：�pȝ��性能下降�Q�状态在��h��和响应中都要通过�|�络往复传输�?br>&nbsp;&nbsp;&nbsp; ②保存的状态只能是字符串�Ş式的��|����M��对象引用必须&#8220;字符串化&#8221;�Q�加密处理�?br>&nbsp; 2. HTTP Cookie的缺点：<br>&nbsp;&nbsp;&nbsp; ①同�?br>&nbsp;&nbsp;&nbsp; ②同上；对于Cookie header的大���有限制�Q�也���限制了能够保存的数据量�?br><br>&nbsp; 安全问题<br><br>&nbsp; <span style="font-weight: bold;">在表现层保存会话状�?/span><br>&nbsp; session ID<br>&nbsp; 优点�Q?br>&nbsp; ①状态保存在Server�Q�不会受到数据量大小或是数据�c�d��斚w��的限制�?br>&nbsp; ②会话状态不会在每个��h��中都通过�|�络传输一�ơ，�pȝ��性能不会受到影响�?br>&nbsp; ③在Server保存会话状态，可以按照需要和代�h�Q�在�J�、简间灵�z�选择�Q�兼��֏�扩展性和性能�?br><br>&nbsp; �~�点�Q?br>&nbsp; 需要在集群的多个Server间复制会话状态�?br><br>&nbsp; <span style="font-weight: bold;">在业务层或资源层保存会话状�?/span><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ||&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ||<br>&nbsp;&nbsp;&nbsp; EJB�l��g&nbsp; 关系型数据库<br><br><span style="font-weight: bold;">控制客户端访�?/span><br><span style="font-weight: bold;">&nbsp; 保护视图</span><br>&nbsp; �{�略�Q?br>&nbsp; ①加入一�U�应用逻辑<br>&nbsp; ②配�|�运行时�pȝ��<br><br>&nbsp; 常见�Ҏ���Q?br>&nbsp; ①采用一个控制器<br>&nbsp; ②在视图中直接加入保�?br><br>&nbsp; 1. <span style="font-weight: bold;">在视囑ֆ�部中实现保护</span><br>&nbsp;&nbsp;&nbsp; a. <span style="font-style: italic;">��d���Ҏ��个资源的讉K��</span><br>&nbsp;&nbsp;&nbsp; b. <span style="font-style: italic;">只阻塞对局部资源的讉K��</span><br>&nbsp; 2. <span style="font-weight: bold;">每页加入&#8220;要么全部 - 要么没有&#8221;的保�?/span><br>&nbsp; 3. <span style="font-weight: bold;">加入寚w��面局部的保护</span><br>&nbsp;&nbsp;&nbsp; a. <span style="font-style: italic;">�Ҏ��用户角色不显�C����囄���局部内�?/span><br>&nbsp;&nbsp;&nbsp; b. <span style="font-style: italic;">�Ҏ���pȝ��状态或错误条�g不显�C����囄���局部内�?/span><br><br><span style="font-weight: bold;">&nbsp; 通过配置实现保护</span><br>&nbsp; web.xml<br>&nbsp; 1. <span style="font-weight: bold;">通过标准安全限制实现资源保护</span><br>&nbsp; 2. <span style="font-weight: bold;">通过一个简单、通用的配�|�实现资源保�?/span><br>&nbsp;&nbsp;&nbsp;&nbsp; 只需把那些限制访问的资源攑ֈ�Web应用�?WEB-INF/目录下即可�?br><br><span style="font-weight: bold;">&nbsp; 重复的表单提�?/span><br>&nbsp; 同步器��o牌（又名&#8220;时曾相识&#8221;令牌�Q?br><br><span style="font-weight: bold;">验证</span><br>&nbsp; 客户�?服务器端验证<br>&nbsp; <span style="font-weight: bold;">在客��L��验证</span><br>&nbsp; JavaScript<br><br>&nbsp; <span style="font-weight: bold;">在服务器端验�?/span><br>&nbsp; 1. <span style="font-weight: bold;">��Z��表单的验�?/span><br>&nbsp;&nbsp;&nbsp;&nbsp; �Ҏ��实现�Q�比较高效；应用�pȝ�����大�Q�造成的重复代码越多�?br>&nbsp; 2. <span style="font-weight: bold;">��Z��抽象�c�d��的验�?/span><br>&nbsp;&nbsp;&nbsp;&nbsp; 从状态中抽象出类型和限制信息�Q�放入一个通用的框架中�?br>&nbsp;&nbsp;&nbsp;&nbsp; 例如�Q�可以��用一个组件或者一个子�pȝ��来封装验证逻辑�?br><br>&nbsp;&nbsp;&nbsp;&nbsp; <span style="font-weight: bold;">�~�陷</span>�Q?br>&nbsp;&nbsp;&nbsp;&nbsp; ①效率、性能上可能具有潜在的损失�Q?br>&nbsp; &nbsp;&nbsp; ②通用解决�Ҏ��强大�Q�但难于理解、不易维护�?br><br><span style="font-weight: bold;">助手�c�d��性——完整性和一致�?/span><br>&nbsp; JavaBean助手�c�通常用于存放由客��L����h��传来的中间状态�?br>&nbsp; &lt;jsp:setProperty name="helper" property="*"/&gt;<br>&nbsp; 当请求中的参数��gؓ�I�的时候，技术规范规定，不对该属性的值做��M��变化�?br><br>&nbsp; <span style="font-weight: bold;">解决�Ҏ��</span>�Q?br>&nbsp; 在多�ơ请求之间重�|�JavaBean的所有状态�?br><br><br><span style="font-weight: bold;">表现层不佛_���?/span><br><span style="font-weight: bold;">多个视图中都包括控制代码</span><br>&nbsp; <span style="font-weight: bold;">参照解决�Ҏ��</span>�Q?br>&nbsp; 合�ƈ控制代码�Q�引入一个控制器和相关的命��o助手�?br><br>&nbsp; <span style="font-style: italic;">Ch4�Q?#8220;引入控制�?#8221;�?#8220;隔离不同逻辑&#8221;</span><br>&nbsp; <span style="font-style: italic;">Ch6�Q?#8220;命��o与控制器�{�略&#8221;�?#8220;视图助手&#8221;</span><br><br><span style="font-weight: bold;">把表现层的数据结构暴露给业务�?/span><br>&nbsp; 表现层的数据�l�构�Q�例�?span style="font-weight: bold;">HttpServletRequest</span>�Q�应该只限于表现层�?br><br>&nbsp; <span style="font-weight: bold;">参照解决�Ҏ��</span>�Q?br>&nbsp; <span style="font-style: italic;">Ch4�Q?#8220;对业务层隐藏表现�l�节&#8221;</span><br><br><span style="font-weight: bold;">把表现层数据�l�构暴露�l�业务领域对�?/span><br>&nbsp; <span style="font-weight: bold;">参照解决�Ҏ��</span>�Q?br>&nbsp; <span style="font-style: italic;">同上</span><br><br><span style="font-weight: bold;">允许重复提交表单</span><br>&nbsp; <span style="font-weight: bold;">参照解决�Ҏ��</span>�Q?br>&nbsp; 需要监���、控制请求流�E��?br><br>&nbsp; <span style="font-style: italic;">Ch4�Q?#8220;引入同步器��o�?#8221;</span><br><br><span style="font-weight: bold;">把敏感资源暴露给客户端的直接讉K��</span><br>&nbsp; <span style="font-weight: bold;">参照解决�Ҏ��</span>�Q?br>&nbsp; 保护敏感资源、禁止客��L��直接讉K���?br><br>&nbsp; <span style="font-style: italic;">Ch4�Q?#8220;对客��L��隐藏资源&#8221;</span><br><br><span style="font-weight: bold;">假定&lt;jsp:setProperty&gt;会重�|�Bean属�?/span><br>&nbsp; <span style="font-weight: bold;">参照解决�Ҏ��</span>�Q?br>&nbsp; ��C��&lt;jsp:setProperty&gt;的这�U�不太直观的赋值机�Ӟ��在��用bean属性之前先做初始赋倹{�?br><br><span style="font-weight: bold;">创徏�?#8220;胖控制器&#8221;</span><br>&nbsp; <span style="font-weight: bold;">参照解决�Ҏ��</span>�Q?br>&nbsp; <span style="font-style: italic;">Ch4�Q?#8220;引入控制�?#8221;�Q�Ch6�Q?#8220;命��o与控制器�{�略&#8221;�Q?/span><br>&nbsp; <span style="font-style: italic;">Ch4�Q?#8220;隔离不同逻辑&#8221;�Q�Ch6�Q?#8220;视图助手&#8221;</span><br><br><span style="font-weight: bold;">把视囑֊�手当作Scriptlet使用</span><br>&nbsp; <span style="font-weight: bold;">参照解决�Ҏ��</span>�Q?br>&nbsp; 视图中的Java Scriptlet�Q���用JSTL助手�Q���用标记库�Q�标记文件助�?br>     <img src ="http://www.aygfsteel.com/qixiangnj/aggbug/139290.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/qixiangnj/" target="_blank">Thomas</a> 2007-08-25 18:49 <a href="http://www.aygfsteel.com/qixiangnj/archive/2007/08/25/139290.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>【J2EE核心模式】——J2EE模式概览</title><link>http://www.aygfsteel.com/qixiangnj/archive/2007/08/12/136214.html</link><dc:creator>Thomas</dc:creator><author>Thomas</author><pubDate>Sun, 12 Aug 2007 12:42:00 GMT</pubDate><guid>http://www.aygfsteel.com/qixiangnj/archive/2007/08/12/136214.html</guid><wfw:comment>http://www.aygfsteel.com/qixiangnj/comments/136214.html</wfw:comment><comments>http://www.aygfsteel.com/qixiangnj/archive/2007/08/12/136214.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/qixiangnj/comments/commentRss/136214.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/qixiangnj/services/trackbacks/136214.html</trackback:ping><description><![CDATA[<span style="font-weight: bold;">模式</span><br>在一�U?span style="color: red; font-weight: bold;">上下�?/span>中，<span style="color: red; font-weight: bold;">一�c�问�?/span>的一�U?span style="color: red; font-weight: bold;">可重复���?/span>�?span style="color: red; font-weight: bold;">解决�Ҏ��</span>�?br><br><span style="font-weight: bold;">发现模式</span><br>模式模板、模式挖�?br>验证模式�Q?span style="font-weight: bold;">大三�?/span>�Q�Rule of Three�Q?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 只有�l�过三个以上不同�pȝ��的校验，一个解��x��案才能从候选模式升��gؓ模式�?br><br>怎样才能最好地交流�q�个模式�Q?br>&nbsp;&nbsp;&nbsp; 两种相近的解��x���?--&gt;&nbsp; 两个不同的模�?br>&nbsp; &nbsp; 相近的想�?--&gt; 同一个模�?br><br><span style="font-weight: bold;">模式 vs �{�略</span><br>&nbsp;||&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ||<br>抽象&nbsp;&nbsp;&nbsp; 实现<br><br><br><span style="font-weight: bold;">分层思�\</span><br><img alt="" src="http://www.aygfsteel.com/images/blogjava_net/qixiangnj/24869/r_j2ee_tier.jpg" align="left" height="401" width="576"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><span style="font-weight: bold;">J2EE模式</span><br><span style="font-weight: bold;">表现层模�?/span><br><img alt="" src="http://www.aygfsteel.com/images/blogjava_net/qixiangnj/24869/r_%e8%a1%a8%e7%8e%b0%e5%b1%82%e6%a8%a1%e5%bc%8f.JPG" align="left" height="239" width="528"><br><br><br><br><br><br><br><br><br><br><br><br><br><span style="font-weight: bold;">业务层模�?/span><br><img alt="" src="http://www.aygfsteel.com/images/blogjava_net/qixiangnj/24869/r_%e4%b8%9a%e5%8a%a1%e5%b1%82%e6%a8%a1%e5%bc%8f.JPG" align="left" height="230" width="523"><br><br><br><br><br><br><br><br><br><br><br><br><br><span style="font-weight: bold;">集成层模�?/span><br><img alt="" src="http://www.aygfsteel.com/images/blogjava_net/qixiangnj/24869/r_%e9%9b%86%e6%88%90%e5%b1%82%e6%a8%a1%e5%bc%8f.JPG" align="left" height="136" width="526"><br><br><br><br><br><br><br><br><br><br><span style="font-weight: bold;">J2EE模式目录指南</span><br>术语<br><br>UML的���?br>&nbsp; �c�d��——静态视�?br>&nbsp; 序列�䏀�—动态视�?br>&nbsp; 构造型�Q�stereotypes�Q�——表现在�c�d��和交互图中不同类型的对象<br><br>UML构造型<br>&nbsp; 构造型�Q�设计师、架构师们创造、��用的一些术语�?br><br><span style="font-weight: bold;">模式模板</span><br>&nbsp; <span style="font-weight: bold;">问题</span><br>&nbsp; <span style="font-weight: bold;">�U�束</span>�Q�原因和动机<br>&nbsp; <span style="font-weight: bold;">解决�Ҏ��</span><br>&nbsp;&nbsp;&nbsp; <span style="font-style: italic; font-weight: bold;">�l�构</span><br>&nbsp;&nbsp;&nbsp; <span style="font-style: italic; font-weight: bold;">�{�略</span><br>&nbsp;&nbsp;&nbsp; <span style="font-style: italic; font-weight: bold;">效果</span><br>&nbsp;&nbsp;&nbsp; <span style="font-style: italic; font-weight: bold;">�C�Z��代码</span><br>&nbsp;&nbsp;&nbsp; <span style="font-style: italic; font-weight: bold;">相关模式<br><br><br></span><span style="font-weight: bold;">J2EE模式关系</span><br>J2EE模式关系图：<br><img alt=""  src="http://www.aygfsteel.com/images/blogjava_net/qixiangnj/24869/r_j2ee%e6%a8%a1%e5%bc%8f%e5%85%b3%e7%b3%bb%e5%9b%be.JPG" align="left" height="480" width="396"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><span style="font-style: italic; font-weight: bold;"></span><span style="font-weight: bold;"> 采用一个新模式�Q�会引入什么新问题�Q?/span><br><span style="font-weight: bold;">回顾模式关系图，考虑替代�Ҏ���?br><br><br>与现有其他模式的关系<br></span>GOF、PEAA<br><br><br><span style="font-weight: bold;">模式路线�?/span><br>P93<br><span style="font-weight: bold;"></span><img src ="http://www.aygfsteel.com/qixiangnj/aggbug/136214.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/qixiangnj/" target="_blank">Thomas</a> 2007-08-12 20:42 <a href="http://www.aygfsteel.com/qixiangnj/archive/2007/08/12/136214.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item></channel></rss>                                                                                                               <footer>
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