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📄 in7_check.htm

📁 struts开发实例
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<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns="http://www.w3.org/TR/REC-html40">

<head>
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<link rel="File-List" href="in7_Check_files/filelist.xml">
<!--[if gte mso 9]>
<xml><o:shapedefaults v:ext="edit" spidmax="1027"/>
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<body>

<p class="MsoNormal" align="center" style="text-align:center"><b>
<span style="font-size: 24.0pt; font-family: 宋体">Struts复选框的实现</span></b></p>
<p class="MsoNormal"><span lang="EN-US">&nbsp;</span></p>
<p class="MsoNormal"><span lang="EN-US">&nbsp;</span></p>
<p class="MsoNormal"><b><span lang="EN-US">[</span><span style="font-family: 宋体">目标</span><span lang="EN-US">]</span></b></p>
<p class="MsoNormal" style="text-indent: 21.0pt"><span style="font-family: 宋体">
本例是在上一个例子“最简单的</span><span lang="EN-US">Struts</span><span style="font-family: 宋体">程序”的基础上（见《如何实现最简单的</span><span lang="EN-US" style="font-family: 宋体">Struts</span><span style="font-family: 宋体">程序》）进行扩展的，其目标是在输入页中实现复选框，在输出页中显示复选框被选的值。</span></p>
<p class="MsoNormal"><span lang="EN-US">&nbsp;&nbsp; </span><span style="font-family: 宋体">
本项目在前面的</span><span lang="EN-US">Simple</span><span style="font-family: 宋体">项目的基础上进行扩展，那当然也可以建立一个新的项目。</span></p>
<p class="MsoNormal"><span lang="EN-US">&nbsp;</span></p>
<p class="MsoNormal"><b><span lang="EN-US">[</span><span style="font-family: 宋体">效果</span><span lang="EN-US">]</span></b></p>
<p class="MsoNormal"><span style="font-family: 宋体">输入页面：</span></p>
<p class="MsoNormal" align="center" style="text-align:center">
<span lang="EN-US"><!--[if gte vml 1]><v:shapetype id="_x0000_t75"
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  <v:f eqn="sum @0 0 1"/>
  <v:f eqn="prod @6 1 2"/>
  <v:f eqn="prod @7 21600 pixelWidth"/>
  <v:f eqn="sum @8 21600 0"/>
  <v:f eqn="prod @7 21600 pixelHeight"/>
  <v:f eqn="sum @10 21600 0"/>
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 <o:lock v:ext="edit" aspectratio="t"/>
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 <v:imagedata src="in7_Check_files/image001.png" o:title=""/>
</v:shape><![endif]--><![if !vml]><img border=0 width=510 height=269
src="in7_Check_files/image002.jpg" v:shapes="_x0000_s1025"><![endif]></span></p>
<p class="MsoNormal"><span style="font-family: 宋体">输出页面：</span></p>
<p class="MsoNormal" align="center" style="text-align:center">
<span lang="EN-US"><!--[if gte vml 1]><v:shape
 id="_x0000_s1026" type="#_x0000_t75" style='width:382.5pt;height:201pt'>
 <v:imagedata src="in7_Check_files/image003.png" o:title=""/>
</v:shape><![endif]--><![if !vml]><img border=0 width=510 height=268
src="in7_Check_files/image004.jpg" v:shapes="_x0000_s1026"><![endif]></span></p>
<p class="MsoNormal"><span lang="EN-US">&nbsp;</span></p>
<p class="MsoNormal"><span lang="EN-US">&nbsp;</span></p>
<p class="MsoNormal"><span lang="EN-US">&nbsp;</span></p>
<p class="MsoNormal"><b><span lang="EN-US">[</span><span style="font-family: 宋体">背景知识</span><span lang="EN-US">]</span></b></p>
<p class="MsoNormal" style="text-indent: 15.8pt"><b>
<span style="font-family:宋体">复选框和多项框标签</span></b></p>
<p class="MsoNormal" style="text-indent: 15.75pt"><span lang="EN-US">
&lt;html:checkbox&gt;</span><span style="font-family: 宋体">标签用于描绘复选框控件。该标签必须嵌套在表单标签中。</span></p>
<p class="MsoNormal" style="text-indent: 21.0pt"><span style="font-family: 宋体">
嵌套在</span><span lang="EN-US">&lt;html:form&gt;</span><span style="font-family: 宋体">中的</span><span lang="EN-US">&lt;html:multibox 
&gt;</span><span style="font-family: 宋体">标签用于描绘</span><span lang="EN-US">HTML</span><span style="font-family: 宋体">复选框控件。如果要用相同的名字描绘多选复选框，与</span><span lang="EN-US">&lt;html:checkbox&gt;</span><span style="font-family: 宋体">相比要优先用该标签，对</span><span lang="EN-US">request</span><span style="font-family: 宋体">对象调用</span><span lang="EN-US">getParameter</span><span lang="EN-US" style="font-family:宋体">Actionalues()传递多选框名字，会返回一个字符串数组。</span></p>
<p class="MsoNormal" style="text-indent: 15.75pt"><span style="font-family: 宋体">
这些标签的属性解释如下，所有的属性都可以在运行时赋值。</span></p>
<p class="MsoNormal" style="text-indent: 15.75pt">
<span lang="EN-US" style="font-family:宋体">&#8226; 
name:bean的名字，该bean的属性被查询，以决定复选框是否描绘成选中。如果没有指定该属性，就用封装它的表单相关联的ActionForm bean的名字。</span></p>
<p class="MsoNormal" style="text-indent: 15.75pt">
<span lang="EN-US" style="font-family:宋体">&#8226; 
property:复选框的名字，也是bean的属性的名字，它决定复选取框是否描绘成选中。对于复选框，property需要一个定义为数组的索引的属性。</span></p>
<p class="MsoNormal" style="text-indent: 15.75pt">
<span lang="EN-US" style="font-family:宋体">&#8226; value:如果选中了复选框，将会送回到服务器的request参数的值。</span></p>
<p class="MsoNormal" style="text-indent: 15.75pt"><span style="font-family:宋体">
使用<span lang="EN-US">&lt;html:checkbox&gt;的一个例子如下所示：</span></span></p>
<p class="MsoNormal" style="text-indent: 15.75pt">
<span lang="EN-US" style="font-family:宋体">&lt;html:checkbox property=”married” 
value=”Y”/&gt;</span></p>
<p class="MsoNormal" style="text-indent: 15.75pt"><span style="font-family:宋体">
其中复选框叫<span lang="EN-US">married，在表单提交时，将送回服务器Y值。</span></span></p>
<p class="MsoNormal"><span lang="EN-US">&nbsp;</span></p>
<p class="MsoNormal"><span lang="EN-US">&nbsp;</span></p>
<p class="MsoNormal"><b><span lang="EN-US">[</span><span style="font-family: 宋体">步骤</span><span lang="EN-US">]</span></b></p>
<p class="MsoNormal"><span lang="EN-US">&nbsp;</span></p>
<p class="MsoNormal"><span lang="EN-US">1</span><span style="font-family: 宋体">、运行</span><span lang="EN-US">JavaWebStudio</span><span style="font-family: 宋体">、打开</span><span lang="EN-US">Simple</span><span style="font-family: 宋体">项目：</span></p>
<p class="MsoNormal" style="text-indent: 21.0pt"><span style="font-family: 宋体">
选择菜单：“文件”</span><span lang="EN-US">----</span><span style="font-family: 宋体">“打开项目”，选择最简单的</span><span lang="EN-US">Struts</span><span style="font-family: 宋体">程序项目</span><span lang="EN-US">Simple</span><span style="font-family: 宋体">目录，通过</span><span lang="EN-US">Simple.prj</span><span style="font-family: 宋体">项目文件打开项目。</span></p>
<p class="MsoNormal"><span lang="EN-US">2</span><span style="font-family: 宋体">、打开</span><span lang="EN-US">HelloWord.jap</span><span style="font-family: 宋体">文件：</span></p>
<p class="MsoNormal" align="center" style="text-align:center">
<span lang="EN-US"><!--[if gte vml 1]><v:shape
 id="_x0000_s1027" type="#_x0000_t75" style='width:177.75pt;height:286.5pt'>
 <v:imagedata src="in7_Check_files/image005.png" o:title=""/>
</v:shape><![endif]--><![if !vml]><img border=0 width=237 height=382
src="in7_Check_files/image006.jpg" v:shapes="_x0000_s1027"><![endif]></span></p>
<p class="MsoNormal"><span lang="EN-US">&nbsp;&nbsp; </span><span style="font-family: 宋体">
从</span><span lang="EN-US">JavaWebStudio</span><span style="font-family: 宋体">文件管理器中打开</span><span lang="EN-US">HelloWord.jap</span><span style="font-family: 宋体">文件，然后切换到工具栏中，选择</span><span lang="EN-US">Struts</span><span style="font-family: 宋体">标签，把“</span><span lang="EN-US">checkbox</span><span style="font-family: 宋体">标签”拖动到代码编辑窗口（或</span><span lang="EN-US">Web</span><span style="font-family: 宋体">可视化编辑窗口）中。</span></p>
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