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JavaBean实现JSP页面和代码分离
在JSP编程中，Struts一般只是用来处理form和业务逻辑，很多时候我们还是需要使用 "<% java code %>" 这样的语句来操作一些输出。这样的方式和ASP很类似，非常不便于程序代码和页面设计维护，网上有很多种分离的解决方案，本文只是我个人推荐的一种简单方式。
首先看我们要进行分离操作的原文件
Test.jsp
- >
My JSP 'Test.jsp' starting page title> </li> <li> </li> <li> head> </li> <li> </li> <li> </li> <li> </li> <li> <body> </li> <li> </li> <li> This is my JSP page. <br> </li> <li> </li> <li> Date : <%= new java.util.Date().toString() %> <br> </li> <li> </li> <li> File : <input value="<%= request.getServletPath() %>" /> </li> <li> </li> <li> body> </li> <li> </li> <li> html> </li> </ol></pre><p>这个JSP文件中包含了两段JSP代码，分别用来输出当前时间和文件路径。虽然简单，但很有代表性，进行文本输出和HTML控件赋值是我们在JSP文件中写Java代码最主要的原因。接下来，我们开始我们的分离过程。</p><p><strong>1. 编写JavaBean</strong></p><p>使用 JavaBean Property 来获取所需的日期和文件名。</p><p>DemoBean.java </p> <pre> <ol> <li>package com.mycompany; </li> <li> </li> <li>import java.util.Date; </li> <li> </li> <li>import javax.servlet.jsp.*; </li> <li> </li> <li>import javax.servlet.http.*; </li> <li> </li> <li>public class DemoBean { </li> <li> </li> <li> private PageContext pageContext; </li> <li> </li> <li> </li> <li> </li> <li> public void setPageContext(PageContext pageContext) { </li> <li> </li> <li> this.pageContext = pageContext; </li> <li> </li> <li> } </li> <li> </li> <li> </li> <li> </li> <li> public String getDate() { </li> <li> </li> <li> return new Date().toString(); </li> <li> </li> <li> } </li> <li> </li> <li> </li> <li> </li> <li> public String getFilename() { </li> <li> </li> <li> HttpServletRequest request = (HttpServletRequest)pageContext.getRequest(); </li> <li> </li> <li> return request.getServletPath(); </li> <li> </li> <li> } </li> <li> </li> <li>} </li> </ol></pre><p>在这个名叫 DemoBean 中，我们提供了setPageContext方法用来获取JSP页面的环境对象。有了该对象，我们就可以象在JSP页面中那样使用 request、response、session 进行相关的操作了。</p><p><strong>2. 创建包含文件</strong></p><p>TestInc.jsp </p></p><p><% demo.setPageContext(pageContext); %></p><p>这是个简单至极的JSP文件，***行代码是声明使用JavaBean的语句，第二行代码调用了DemoBean.setPageContext()方法将当前JSP页面的pageContext对象传递到demo对象中，这下你知道DemoBean是如何获得环境对象的吧。至于为什么需要使用这个jsp文件来达到使用JavaBean实现JSP页面的目的？请继续往下看。</p><p><strong>3. 修改原JSP文件</strong></p><p>Test.jsp </p> <pre> <ol> <li><%@ include file="TestInc.jsp" %> </li> <li> </li> <li>> </li> <li> </li> <li><html> </li> <li> </li> <li> <head> </li> <li> </li> <li> <title>My JSP 'Test.jsp' starting page title> </li> <li> </li> <li> head> </li> <li> </li> <li> <body> </li> <li> </li> <li> This is my JSP page. <br> </li> <li> </li> <li> Date : <jsp:getProperty name="demo" property="date" /> <br> </li> <li> </li> <li> File : <input value="<jsp:getProperty name="demo" property="filename" />"/> </li> <li> </li> <li> body> </li> <li> </li> <li> html> </li> </ol></pre><p>请注意修改后的JSP文件***行，我们使用了一个include语句，将我们刚才创建的 TestInc.jsp 文件包含了进来。下面有关日期和文件名的语句也是使用JavaBean的标准语法。运行一下，看看是不是和原来的Test.jsp一样。</p><p>include 指令所包含的 jsp 文件，会在***次运行时和原文件合并，被编译成一个完整的 servlet。</p><p>jsp:getProperty 的 property 值从 "getFilename" 变成了 "filename"，一定要注意，很多人正在为这个郁闷着呢。</p><p>好了，我们总结一下这种使用JavaBean实现JSP页面方式的好处：</p><p>1. 修改后的JSP文件不再包含java代码，JavaBean Class更利于程序代码的维护。</p><p>2. 程序开发人员使用简单的空白页就可以进行开发，待页面设计人员提交目标页后，只需简单的编辑即可完成替换。</p><p>3. html代码变得非常干净，页面设计人员修改页面文件时，不用担心误删除程序代码了。</p><p>4. 使用INC文件，可以包含多个JavaBean的声明，利于将不同的任务分解成多个JavaBean，多个程序员可以独立、不受干扰地工作。</p><p>5. 开发人员甚至可以直接在该包含文件内部直接创建 Java 方法，就像你原来所熟悉的那样。</p><p>【编辑推荐】</p> <ol> <li>JavaBean与MBean详解</li> <li>Servlet与Javabean配置</li> <li>JavaBean使用技巧 </li> <li>JavaBean实现多文件上传的两种方法</li> <li>JavaBean与MBean详解 </li> </ol> <br> 分享名称：JavaBean实现JSP页面和代码分离 <br> 分享链接：<a href="http://jxjierui.cn/article/dhgdohd.html">http://jxjierui.cn/article/dhgdohd.html</a> </div> <div class="hot_new"> <div class="page_title clearfix"> <h3>其他资讯</h3> </div> <div class="news_list clearfix"> <ul> <li> <a href="/article/cdjdsdc.html">国外云服务器如何选择</a> </li><li> <a href="/article/cdjdcpo.html">探索边缘计算与云计算之间的区别</a> </li><li> <a href="/article/cdjdcgo.html">UML绘图工具组成元素解析</a> </li><li> <a href="/article/cdjdsoj.html">访问服务器提示网络密码无效？这些方法帮你解决！</a> </li><li> <a href="/article/cdjdcjc.html">什么叫IDC？idc客户自服务平台</a> </li> </ul> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> <!-- 底部信息 --> <div class="footer wow fadeInUp"> 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--END-- [ RunTime:0.000024s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_begin ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000145s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_begin ] --END-- [ RunTime:0.000157s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_parse ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ template_filter ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ContentReplaceBehavior [ RunTime:0.000048s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ template_filter ] --END-- [ RunTime:0.000066s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ParseTemplateBehavior [ RunTime:0.003381s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_parse ] --END-- [ RunTime:0.003396s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_filter ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000063s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_filter ] --END-- [ RunTime:0.000072s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_end ] --START--</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= ) </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: pid /home/wwwroot/jxjierui.cn/App/Home/Controller/ArticleController.class.php 第 47 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] file_put_contents(./App/Runtime/Temp/d439cae3f42d179dfb2d62909db7be8f.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_host /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 120 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_port /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 121 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_name /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 122 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] file_put_contents(./App/Runtime/Temp/79f854b524024d85c90e56f5fdc2303d.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> </ol> </div> </div> </div> <div id="think_page_trace_close" style="display:none;text-align:right;height:15px;position:absolute;top:10px;right:12px;cursor: pointer;"><img style="vertical-align:top;" 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3ukcXd5s7LvLD3me61WkuTCpJzYAyRurMB44EdEJzTfU271lUJC03YjXJXzYOGZwN4D8eB5jlfLrdWfzGRW7icMPfiSO6Oe7s20bmhdgLX4Z23B+s3JgQESzUDiMboSzDMHFpNMwccGePauhfwjzwnI2wu9zKGgEFg80jcZ7MHllk07s1H+5yojtUQTlH4nFdLKTGwDmPbIklOb1L1zO4T6N8NCuDLFLS/C63c0eNRimZ++s5BMBHxU11jHchI9oFVUxRh/eMDzHEzGYu0Lg8gJ7oS/tFCwoic44fyUtix0n/46vP4bf+//BRgAYwDDar4ncHIAAAAASUVORK5CYII="></div> 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