📄 strus 2的新表单标志的使用 - max on java - blogjava.htm
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<DIV class=postTitle><A class=postTitle2 id=viewpost1_TitleUrl
href="http://www.blogjava.net/max/archive/2007/05/18/118442.html">Strus
2的新表单标志的使用</A> </DIV>
<P> Struts
2为大家提供了不少常用的很酷的表单标志，简化了我们程序员的工作。不过，由于这些都是新标志，大家可能在使用上还存在不少疑问。本文将就朋友们的回复、留言或Email上的问题，分别对这些酷标志进行讲述。</P>
<H2>表单标志使用小技巧</H2>
<P>Struts 2的表单标志在输出（render）HTML时，使用了模板的概念，增加了复杂性（因为它不像Struts
1.x的表单标志，它通常都是一个标志对应HTML的一个元素），因此大家在使用时，需要一些技巧：</P>
<OL>
<LI>Struts 2的UI标志的表单标志默认是以表格布局，按钮是右对齐的。如果你不喜欢此风格，你可以简单地将<s:form
/>标志的“theme”属性设为“simple”，然后用以往的做法自已布局表单元素（注意：此法有利有弊，弊就是当你将“theme”属性设为“simple”时，表单标志以最简单方式输出HTML，所以你可能失去一些默认输出提供的便利，如：友好的错误信息的显示，或客户端的表单验证等）。当然更好的做法是通过CSS或自定义主题（theme）然后应用到整个应用程序，这样可以获得一致的页面风格，加强用户体验（我会在以后的文章对此进行讲解）；
<LI>当你在页面上加入某些标志（如：<s:doubleselect
/>等）时，应该通过action来访问页面，而不是通过*.jsp的URL直接访问。 </LI></OL>
<P>下面我将分别对这些标志进行讲述：</P>
<H2>1、<s:checkboxlist /></H2>
<P>大家对<s:checkboxlist />的最大的疑问可能是：“如何在默认情况下，选中某些checkbox？”</P>
<P>答案其实很简单，只需要将其“value”属性设为你的要选中的值，如以代码所示：</P>
<DIV
style="BORDER-RIGHT: #cccccc 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #cccccc 1px solid; PADDING-LEFT: 4px; FONT-SIZE: 13px; PADDING-BOTTOM: 4px; BORDER-LEFT: #cccccc 1px solid; WIDTH: 98%; WORD-BREAK: break-all; PADDING-TOP: 4px; BORDER-BOTTOM: #cccccc 1px solid; BACKGROUND-COLOR: #eeeeee"><SPAN
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style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">java</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5"> contentType</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">=</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">text/html;
charset=utf-8</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5"> pageEncoding</SPAN><SPAN
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style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">utf-8</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5"> </SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #ffff00">%></SPAN><SPAN
style="COLOR: #000000"><BR></SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #ffff00"><%</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">@ taglib prefix</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">=</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">s</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5"> uri</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">=</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">/struts-tags</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5"> </SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #ffff00">%></SPAN><SPAN
style="COLOR: #000000"><BR><BR></SPAN><SPAN
style="COLOR: #0000ff"><!</SPAN><SPAN style="COLOR: #ff00ff">DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"</SPAN><SPAN
style="COLOR: #0000ff">></SPAN><SPAN style="COLOR: #000000"><BR></SPAN><SPAN
style="COLOR: #0000ff"><</SPAN><SPAN style="COLOR: #800000">html </SPAN><SPAN
style="COLOR: #ff0000">xmlns</SPAN><SPAN
style="COLOR: #0000ff">="http://www.w3.org/1999/xhtml"</SPAN><SPAN
style="COLOR: #0000ff">></SPAN><SPAN style="COLOR: #000000"><BR></SPAN><SPAN
style="COLOR: #0000ff"><</SPAN><SPAN style="COLOR: #800000">head</SPAN><SPAN
style="COLOR: #0000ff">></SPAN><SPAN style="COLOR: #000000"><BR>
</SPAN><SPAN style="COLOR: #0000ff"><</SPAN><SPAN
style="COLOR: #800000">title</SPAN><SPAN style="COLOR: #0000ff">></SPAN><SPAN
style="COLOR: #000000">Struts 2 Cool Tags - </SPAN><SPAN
style="COLOR: #ff0000">&lt;</SPAN><SPAN
style="COLOR: #000000">s:checkboxlist/ </SPAN><SPAN
style="COLOR: #ff0000">&gt;</SPAN><SPAN
style="COLOR: #0000ff"></</SPAN><SPAN
style="COLOR: #800000">title</SPAN><SPAN style="COLOR: #0000ff">></SPAN><SPAN
style="COLOR: #000000"><BR> </SPAN><SPAN
style="COLOR: #0000ff"><</SPAN><SPAN style="COLOR: #800000">s:head
</SPAN><SPAN style="COLOR: #0000ff">/></SPAN><SPAN
style="COLOR: #000000"><BR></SPAN><SPAN style="COLOR: #0000ff"></</SPAN><SPAN
style="COLOR: #800000">head</SPAN><SPAN style="COLOR: #0000ff">></SPAN><SPAN
style="COLOR: #000000"><BR></SPAN><SPAN style="COLOR: #0000ff"><</SPAN><SPAN
style="COLOR: #800000">body</SPAN><SPAN style="COLOR: #0000ff">></SPAN><SPAN
style="COLOR: #000000"> <BR> </SPAN><SPAN
style="COLOR: #0000ff"><</SPAN><SPAN style="COLOR: #800000">h2</SPAN><SPAN
style="COLOR: #0000ff">></SPAN><SPAN
style="COLOR: #ff0000">&lt;</SPAN><SPAN
style="COLOR: #000000">s:checkboxlist/</SPAN><SPAN
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