in8_select.htm

Struts 开发实例,Struts 开发实例

<span style="font-family: 宋体">打开</span><span lang="EN-US">HelloWord.jap</span><span style="font-family: 宋体">文件，点击工具条上的运行按钮或选择菜单“运行”</span><span lang="EN-US">—</span><span style="font-family: 宋体">“</span>
<span style="font-family: 宋体">运行（</span><span lang="EN-US">web</span><span style="font-family: 宋体">浏览）”这时打开显示出</span><span lang="EN-US">HelloWord.jsp</span><span style="font-family: 宋体">的运行结果。</span></p>
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在运行结果页面中的输入框中输入“选择”，并选择下拉框中“第二项”，然后点击“提交”按钮，这时转发到</span><span lang="EN-US">HelloWordOut.jsp</span><span style="font-family: 宋体">文件，</span><span lang="EN-US">HelloWordOut.jsp</span><span style="font-family: 宋体">页面中输出“选择”一词，第二行输出了选择结果“第二项”。</span></p>
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<p class="MsoNormal"><span lang="EN-US">&nbsp;</span></p>
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*********************************************************************************</span></p>
<p class="MsoNormal" style="text-indent: 21.0pt"><span lang="EN-US">[</span><span style="font-family: 宋体">扩展部分</span><span lang="EN-US">]</span></p>
<p class="MsoNormal" style="text-indent: 42.0pt"><span style="font-family:宋体">
上面是通过手工编写<span lang="EN-US">&lt;html:option/&gt;的value数据来实现下拉列表框的数据填充的，这种方法容易理解，容易实现，但缺点一是不能从服务器中动态填充数据（例如从数据库中读取数据进行填充），二是当有多个输出页面使用同样的下拉列表框时，每个地主都要手工写一次数据填充，也不好维护。下面将采用Bean数据的方式填充下拉列表框，解决上述问题。</span></span></p>
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<span lang="EN-US" style="font-family:宋体">&nbsp;</span></p>
<p class="MsoNormal" style="text-indent: 42.0pt"><span style="font-family:宋体">修改<span lang="EN-US">HelloWordAction.java文件：</span></span></p>
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首先加入：</span></p>
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<span lang="EN-US" style="font-family:宋体">import java.util.List;</span></p>
<p class="MsoNormal" style="text-indent: 62.6pt">
<span lang="EN-US" style="font-family:宋体">import java.util.ArrayList;</span></p>
<p class="MsoNormal" style="text-indent: 42.0pt"><span style="font-family:宋体">
然后再加入：</span></p>
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<span lang="EN-US" style="font-family:宋体">&nbsp; List myList = new ArrayList();</span></p>
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<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; &nbsp;myList.add(&quot;第一项&quot;);</span></p>
<p class="MsoNormal" style="text-indent: 42.0pt">
<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; &nbsp;myList.add(&quot;第二项&quot;);</span></p>
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<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; &nbsp;myList.add(&quot;第三项&quot;);</span></p>
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<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; 
&nbsp;request.setAttribute(&quot;myList&quot;,myList);</span></p>
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<span lang="EN-US" style="font-family:宋体">&nbsp;</span></p>
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<span lang="EN-US" style="font-family:宋体">HelloWordAction.java文件全部代码如下：</span></p>
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<span lang="EN-US" style="font-family:宋体">package&nbsp; emptyprj;</span></p>
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<span lang="EN-US" style="font-family:宋体">import 
java.lang.reflect.InvocationTargetException;</span></p>
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<span lang="EN-US" style="font-family:宋体">import java.util.Locale;</span></p>
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<span lang="EN-US" style="font-family:宋体">import javax.servlet.ServletException;</span></p>
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<span lang="EN-US" style="font-family:宋体">import javax.servlet.http.HttpSession;</span></p>
<p class="MsoNormal" style="text-indent: 42.0pt">
<span lang="EN-US" style="font-family:宋体">import 
javax.servlet.http.HttpServletRequest;</span></p>
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<span lang="EN-US" style="font-family:宋体">import 
javax.servlet.http.HttpServletResponse;</span></p>
<p class="MsoNormal" style="text-indent: 42.0pt">
<span lang="EN-US" style="font-family:宋体">import 
org.apache.commons.beanutils.PropertyUtils;</span></p>
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<span lang="EN-US" style="font-family:宋体">import org.apache.commons.logging.Log;</span></p>
<p class="MsoNormal" style="text-indent: 42.0pt">
<span lang="EN-US" style="font-family:宋体">import 
org.apache.commons.logging.LogFactory;</span></p>
<p class="MsoNormal" style="text-indent: 42.0pt">
<span lang="EN-US" style="font-family:宋体">import 
org.apache.struts.action.Action;</span></p>
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<span lang="EN-US" style="font-family:宋体">import 
org.apache.struts.action.ActionError;</span></p>
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<span lang="EN-US" style="font-family:宋体">import 
org.apache.struts.action.ActionErrors;</span></p>
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<span lang="EN-US" style="font-family:宋体">import 
org.apache.struts.action.ActionForm;</span></p>
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<span lang="EN-US" style="font-family:宋体">import 
org.apache.struts.action.ActionForward;</span></p>
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<span lang="EN-US" style="font-family:宋体">import 
org.apache.struts.action.ActionMapping;</span></p>
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<span lang="EN-US" style="font-family:宋体">import 
org.apache.struts.action.ActionServlet;</span></p>
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<span lang="EN-US" style="font-family:宋体">import 
org.apache.struts.util.ModuleException;</span></p>
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<span lang="EN-US" style="font-family:宋体">import 
org.apache.struts.util.MessageResources;</span></p>
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<span lang="EN-US" style="font-family:宋体">&nbsp;</span></p>
<p class="MsoNormal" style="text-indent: 42.15pt"><b>
<span lang="EN-US" style="font-family:宋体">import java.util.List;</span></b></p>
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<span lang="EN-US" style="font-family:宋体">import java.util.ArrayList;</span></b></p>
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<span lang="EN-US" style="font-family:宋体">&nbsp;</span></p>
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<span lang="EN-US" style="font-family:宋体">&nbsp;</span></p>
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<span lang="EN-US" style="font-family:宋体">public final class HelloWordAction 
extends Action </span></p>
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<span lang="EN-US" style="font-family:宋体">{</span></p>
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<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; // 变量定义：</span></p>
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<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; private Log log = 
LogFactory.getLog(&quot;org.apache.struts.webapp.Example&quot;);</span></p>
<p class="MsoNormal" style="text-indent: 42.0pt">
<span lang="EN-US" style="font-family:宋体">&nbsp;</span></p>
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<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; //函数定义：</span></p>
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<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; public ActionForward 
execute(ActionMapping mapping,</span></p>
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<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;ActionForm form,</span></p>
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<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;HttpServletRequest 
request,</span></p>
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<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;HttpServletResponse 
response)</span></p>
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<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; throws Exception </span></p>
<p class="MsoNormal" style="text-indent: 42.0pt">
<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; {</span></p>
<p class="MsoNormal" style="text-indent: 42.0pt">
<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; // Extract attributes and 
parameters we will need</span></p>
<p class="MsoNormal" style="text-indent: 42.0pt">
<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; Locale locale = 
getLocale(request);</span></p>
<p class="MsoNormal" style="text-indent: 42.0pt">
<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; MessageResources messages = 
getResources(request);</span></p>
<p class="MsoNormal" style="text-indent: 42.0pt">
<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; HttpSession session = 
request.getSession();</span></p>
<p class="MsoNormal" style="text-indent: 42.0pt">
<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; HelloWordForm myform = 
(HelloWordForm) form;</span></p>
<p class="MsoNormal" style="text-indent: 42.0pt">
<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; String variable1= 
myform.getMybeanvariable1();</span></p>
<p class="MsoNormal" style="text-indent: 42.0pt">
<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; </span></p>
<p class="MsoNormal" style="text-indent: 42.0pt">
<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp; <b>&nbsp;&nbsp;List myList = new ArrayList();</b></span></p>
<p class="MsoNormal" style="text-indent: 42.15pt"><b>
<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; &nbsp;myList.add(&quot;第一项&quot;);</span></b></p>
<p class="MsoNormal" style="text-indent: 42.15pt"><b>
<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; &nbsp;myList.add(&quot;第二项&quot;);</span></b></p>
<p class="MsoNormal" style="text-indent: 42.15pt"><b>
<span lang="EN-US" style="font-family:宋体">&nbsp;&nbsp;&nbsp; &nbsp;myList.add(&quot;第三项&quot;);</span></b></p>