?? 常用的struts 2_0的標志（tag）介紹 - 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/2006/10/18/75857.html">常用的Struts
2.0的標志（Tag）介紹</A> </DIV>
<P>在上一篇文章《<A
href="http://www.blogjava.net/max/archive/2006/10/10/74353.html">為Struts
2.0做好準備</A>》中，我過于詳細地介紹了Struts 2.0開發環境和運行環境的配置，所以，本文很少涉及的以上兩方面的細節。如果，您看完《<A
href="http://www.blogjava.net/max/archive/2006/10/10/74353.html">為Struts
2.0做好準備</A>》后，還有什么不明白，或者沒法運行文中例子，請聯系我。我的E-MAIL：Max.M.Yuan@gmail.com。<BR></P>
<P>在介紹常用標志前，我想先從總體上，對Struts 1.x與Struts 2.0的標志庫（Tag Library）作比較。 </P>
<TABLE style="BORDER-TOP: #008000 2px solid; BORDER-BOTTOM: #008000 2px solid"
cellSpacing=0 cellPadding=2 border=0>
<TBODY>
<TR>
<TD
style="FONT-WEIGHT: bold; BORDER-BOTTOM: #008000 1px solid; HEIGHT: 21px; BACKGROUND-COLOR: #ccffcc"> </TD>
<TD
style="FONT-WEIGHT: bold; BORDER-BOTTOM: #008000 1px solid; HEIGHT: 21px; BACKGROUND-COLOR: #ccffcc">Struts
1.x</TD>
<TD
style="FONT-WEIGHT: bold; BORDER-BOTTOM: #008000 1px solid; HEIGHT: 21px; BACKGROUND-COLOR: #ccffcc">Struts
2.0</TD></TR>
<TR>
<TD>分類</TD>
<TD>將標志庫按功能分成HTML、Tiles、Logic和Bean等幾部分</TD>
<TD>嚴格上來說，沒有分類，所有標志都在URI為“/struts-tags”命名空間下，不過，我們可以從功能上將其分為兩大類：非UI標志和UI標志</TD></TR>
<TR>
<TD>表達式語言（expression languages）</TD>
<TD>不支持嵌入語言（EL）</TD>
<TD>OGNL、JSTL、Groovy和Velcity</TD></TR></TBODY></TABLE><SPAN
style="FONT-SIZE: 11px; FONT-STYLE: italic">以上表格，純屬個人總結，如有所不足或錯誤，請不吝指正</SPAN>
<BR>
<P>好了，我要開始介紹“常用”（這里所謂的“常用”，是指在已往工作中使用Struts里經常用到的）的標志了。</P>
<P style="TEXT-ALIGN: center"></P>
<TABLE
style="BORDER-RIGHT: #f0c000 1px solid; BORDER-TOP: #f0c000 1px solid; BORDER-LEFT: #f0c000 1px solid; BORDER-BOTTOM: #f0c000 1px solid; BACKGROUND-COLOR: #ffffce"
cellSpacing=0 cellPadding=0 border=0>
<TBODY>
<TR>
<TD
style="PADDING-RIGHT: 4px; PADDING-LEFT: 4px; PADDING-BOTTOM: 4px; PADDING-TOP: 4px; HEIGHT: 39px"><IMG
src="常用的Struts 2_0的標志（Tag）介紹 - Max On Java - BlogJava.files/lightbulb_on.gif">
</TD>
<TD
style="PADDING-RIGHT: 4px; PADDING-LEFT: 4px; PADDING-BOTTOM: 4px; PADDING-TOP: 4px; FONT-FAMILY: 華文仿宋; HEIGHT: 39px"
align=left>要在JSP中使用Struts
2.0標志，先要指明標志的引入。通過在JSP的代碼的頂部加入以下代碼可以做到這點。<BR><SPAN
style="FONT-SIZE: 10pt; COLOR: #bf5f3f; FONT-FAMILY: 'Courier New'"><%@</SPAN><SPAN
style="FONT-SIZE: 10pt; COLOR: #3f7f7f; FONT-FAMILY: 'Courier New'">taglib
</SPAN><SPAN
style="FONT-SIZE: 10pt; COLOR: #7f007f; FONT-FAMILY: 'Courier New'">prefix</SPAN><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Courier New'">=</SPAN><SPAN
style="FONT-SIZE: 10pt; COLOR: #2a00ff; FONT-FAMILY: 'Courier New'">"s"
</SPAN><SPAN
style="FONT-SIZE: 10pt; COLOR: #7f007f; FONT-FAMILY: 'Courier New'">uri</SPAN><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Courier New'">=</SPAN><SPAN
style="FONT-SIZE: 10pt; COLOR: #2a00ff; FONT-FAMILY: 'Courier New'">"/struts-tags"
</SPAN><SPAN
style="FONT-SIZE: 10pt; COLOR: #bf5f3f; FONT-FAMILY: 'Courier New'">%></SPAN></TD></TR></TBODY></TABLE>
<OL>
<LI style="FONT-WEIGHT: bold; FONT-SIZE: 14px">非UI標志
<UL>
<LI style="FONT-SIZE: 12px">if、elseif和else
<DIV style="FONT-WEIGHT: normal">
<P>描述：<BR>執行基本的條件流轉。 </P>
<P>參數： </P>
<TABLE
style="BORDER-TOP: #008000 2px solid; BORDER-BOTTOM: #008000 2px solid"
cellSpacing=0 cellPadding=4 border=0>
<TBODY>
<TR>
<TD
style="FONT-WEIGHT: bold; BORDER-BOTTOM: #008000 1px solid; HEIGHT: 21px; BACKGROUND-COLOR: #ccffcc">名稱</TD>
<TD
style="FONT-WEIGHT: bold; BORDER-BOTTOM: #008000 1px solid; HEIGHT: 21px; BACKGROUND-COLOR: #ccffcc">必需</TD>
<TD
style="FONT-WEIGHT: bold; BORDER-BOTTOM: #008000 1px solid; HEIGHT: 21px; BACKGROUND-COLOR: #ccffcc">默認</TD>
<TD
style="FONT-WEIGHT: bold; BORDER-BOTTOM: #008000 1px solid; HEIGHT: 21px; BACKGROUND-COLOR: #ccffcc">類型</TD>
<TD
style="FONT-WEIGHT: bold; BORDER-BOTTOM: #008000 1px solid; HEIGHT: 21px; BACKGROUND-COLOR: #ccffcc">描述</TD>
<TD
style="FONT-WEIGHT: bold; BORDER-BOTTOM: #008000 1px solid; HEIGHT: 21px; BACKGROUND-COLOR: #ccffcc">備注</TD></TR>
<TR>
<TD>test</TD>
<TD>是</TD>
<TD></TD>
<TD>Boolean</TD>
<TD>決定標志里內容是否顯示的表達式</TD>
<TD>else標志沒有這個參數</TD></TR>
<TR>
<TD>id</TD>
<TD>否</TD>
<TD></TD>
<TD>Object/String</TD>
<TD>用來標識元素的id。在UI和表單中為HTML的id屬性 </TD>
<TD></TD></TR></TBODY></TABLE>
<P>例子： </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
style="COLOR: #000000; BACKGROUND-COLOR: #ffff00"><%</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">@ page 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"> </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
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