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📄 常用的struts 2_0的标志（tag）介绍 - 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的标志（Tag）介绍</A> </DIV>
<P>在上一篇文章《<A 
href="http://www.blogjava.net/max/archive/2006/10/10/74353.html">为Struts 
2.0做好准备</A>》中，我过于详细地介绍了Struts 2.0开发环境和运行环境的配置，所以，本文很少涉及的以上两方面的细节。如果，您看完《<A 
href="http://www.blogjava.net/max/archive/2006/10/10/74353.html">为Struts 
2.0做好准备</A>》后，还有什么不明白，或者没法运行文中例子，请联系我。我的E-MAIL：Max.M.Yuan@gmail.com。<BR></P>
<P>在介绍常用标志前，我想先从总体上，对Struts 1.x与Struts 2.0的标志库（Tag Library）作比较。 </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">&nbsp;</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>分类</TD>
    <TD>将标志库按功能分成HTML、Tiles、Logic和Bean等几部分</TD>
    <TD>严格上来说，没有分类，所有标志都在URI为“/struts-tags”命名空间下，不过，我们可以从功能上将其分为两大类：非UI标志和UI标志</TD></TR>
  <TR>
    <TD>表达式语言（expression languages）</TD>
    <TD>不支持嵌入语言（EL）</TD>
    <TD>OGNL、JSTL、Groovy和Velcity</TD></TR></TBODY></TABLE><SPAN 
style="FONT-SIZE: 11px; FONT-STYLE: italic">以上表格，纯属个人总结，如有所不足或错误，请不吝指正</SPAN> 
<BR>
<P>好了，我要开始介绍“常用”（这里所谓的“常用”，是指在已往工作中使用Struts里经常用到的）的标志了。</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的标志（Tag）介绍 - 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: 华文仿宋; HEIGHT: 39px" 
    align=left>要在JSP中使用Struts 
      2.0标志，先要指明标志的引入。通过在JSP的代码的顶部加入以下代码可以做到这点。<BR><SPAN 
      style="FONT-SIZE: 10pt; COLOR: #bf5f3f; FONT-FAMILY: 'Courier New'">&lt;%@</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'">%&gt;</SPAN></TD></TR></TBODY></TABLE>
<OL>
  <LI style="FONT-WEIGHT: bold; FONT-SIZE: 14px">非UI标志 
  <UL>
    <LI style="FONT-SIZE: 12px">if、elseif和else 
    <DIV style="FONT-WEIGHT: normal">
    <P>描述：<BR>执行基本的条件流转。 </P>
    <P>参数： </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">名称</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">默认</TD>
        <TD 
        style="FONT-WEIGHT: bold; BORDER-BOTTOM: #008000 1px solid; HEIGHT: 21px; BACKGROUND-COLOR: #ccffcc">类型</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">备注</TD></TR>
      <TR>
        <TD>test</TD>
        <TD>是</TD>
        <TD></TD>
        <TD>Boolean</TD>
        <TD>决定标志里内容是否显示的表达式</TD>
        <TD>else标志没有这个参数</TD></TR>
      <TR>
        <TD>id</TD>
        <TD>否</TD>
        <TD></TD>
        <TD>Object/String</TD>
        <TD>用来标识元素的id。在UI和表单中为HTML的id属性 </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">&lt;%</SPAN><SPAN 
    style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">@&nbsp;page&nbsp;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;&nbsp;charset=UTF-8</SPAN><SPAN 
    style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN><SPAN 
    style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">&nbsp;</SPAN><SPAN 
    style="COLOR: #000000; BACKGROUND-COLOR: #ffff00">%&gt;</SPAN><SPAN 
    style="COLOR: #000000"><BR></SPAN><SPAN 
    style="COLOR: #000000; BACKGROUND-COLOR: #ffff00">&lt;%</SPAN><SPAN 
    style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">@&nbsp;taglib&nbsp;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">&nbsp;uri</SPAN><SPAN
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