📄 csdn_文档中心_struts快速学习指南14(内部培训教材)-大部分素材来自于《programming jakarta struts》一书.htm
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<TD align=right><A href="http://www.csdn.net/">CSDN</A> - <A
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<TD><B> Struts快速学习指南14(内部培训教材)-大部分素材来自于《Programming
Jakarta Struts》一书</B> lzasp800（原作） </TD></TR>
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<TD align=middle bgColor=#003399><FONT color=#ffffff>关键字</FONT></TD>
<TD width=500> Struts MVC Framework</TD></TR>
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<H1 style="MARGIN: 6pt 0cm 3pt; TEXT-INDENT: 0cm"><A
name=_Toc70351661></A><A name=_Toc69320880><SPAN
style="mso-bookmark: _Toc70351661"><SPAN lang=EN-US
style="mso-bidi-font-family: 宋体"><SPAN
style="mso-list: Ignore"><FONT face=宋体 size=3>1.</FONT><SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN lang=EN-US><FONT face=宋体 size=3>JSP
自定义标签库</FONT></SPAN></SPAN></A></H1>
<H2 style="MARGIN: 6pt 0cm 3pt; TEXT-INDENT: 0cm"><A
name=_Toc70351662></A><A name=_Toc69320881><SPAN
style="mso-bookmark: _Toc70351662"><SPAN lang=EN-US
style="mso-bidi-font-family: 宋体"><SPAN
style="mso-list: Ignore"><FONT face=宋体 size=2>1.1</FONT><SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><FONT face=宋体 size=2>概述</FONT></SPAN></A></H2>
<P style="TEXT-INDENT: 18pt; mso-char-indent-count: 1.8"><SPAN
style="FONT-SIZE: 10pt"><FONT face=宋体>在<SPAN
lang=EN-US>JSP开发中会遇到一些重复的工作。而使用自定义标签库是一种方法，可以用来将这些功能封装起来并在多个项目中重新用到它。此外，应用逻辑还可以包含在基于服务器的资源中，比如JavaBeans。这种架构显示出使用自定义标签库可以更快更容易地开发基于Web的应用程序。<o:p></o:p></SPAN></FONT></SPAN></P>
<P style="TEXT-INDENT: 18pt; mso-char-indent-count: 1.8"><SPAN
style="FONT-SIZE: 10pt"><FONT face=宋体>有关<SPAN
lang=EN-US>JavaBeans和自定义标签库的最初想法是：在程序员研究那些包含商务逻辑（business
logic）的类的同时，Web设计师可以同步进行页面设计。然后，Web设计师可以通过使用简单的“连线”将JSP页面和这些类联系起来。尽管使用JavaBean会减少在JSP页面中写代码的数量，但你还是得写程序去使用这些Beans。<o:p></o:p></SPAN></FONT></SPAN></P>
<P style="TEXT-INDENT: 18pt; mso-char-indent-count: 1.8"><SPAN
style="FONT-SIZE: 10pt"><FONT face=宋体>然而使用自定义标签库则是一种完全无需在<SPAN
lang=EN-US>JSP中写代码的好办法。这并不是说自定义标签库会取代JavaBeans，它们都是用来分离实际内容和显示形式的。JavaBeans在用于商务逻辑被重用的设计中作用更为明显。JavaBeans通常能在不同项目的各种页面中被用到。另一方面，自定义标签库则是一个特殊页面的自定义形式，即便如此，将它重新利用到其他程序中也是很常见的。得到自定义标签库的一种方法是自己建一个。但为什么不使用现成的呢？比如Jakarta
Taglibs项目（源自Apache Software
Foundation）就提供了一些自定义标签库，它们可以在不同的JSP应用程序中重复使用。
<o:p></o:p></SPAN></FONT></SPAN></P>
<H2 style="MARGIN: 6pt 0cm 3pt; TEXT-INDENT: 0cm"><A
name=_Toc70351663></A><A name=_Toc69320882><SPAN
style="mso-bookmark: _Toc70351663"><SPAN lang=EN-US
style="mso-bidi-font-family: 宋体"><SPAN
style="mso-list: Ignore"><FONT face=宋体 size=2>1.2</FONT><SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN lang=EN-US><FONT face=宋体
size=2>Struts包含的标签库</FONT></SPAN></SPAN></A></H2>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.8"><FONT
size=2><FONT face=宋体><SPAN
lang=EN-US>Struts框架提供了一系列的框架组件，同时，他也提供了一系列的标签(Tag)用于和框架进行交互。Struts提供的标签包含在以下四个标签库(Tag
</SPAN><SPAN lang=EN-GB
style="mso-ansi-language: EN-GB">libraries</SPAN><SPAN
lang=EN-US>)中：</SPAN></FONT></FONT></P>
<P class=doclist
style="MARGIN: auto 0cm auto 36pt; TEXT-INDENT: -18pt"><SPAN lang=DA
style="FONT-SIZE: 10pt; FONT-FAMILY: Symbol; mso-ansi-language: DA">·</SPAN><SPAN
lang=DA
style="FONT-SIZE: 7pt; mso-ansi-language: DA">
</SPAN><SPAN lang=DA style="mso-ansi-language: DA"><FONT size=3>HTML
<o:p></o:p></FONT></SPAN></P>
<P class=doclist
style="MARGIN: auto 0cm auto 36pt; TEXT-INDENT: -18pt"><SPAN lang=DA
style="FONT-SIZE: 10pt; FONT-FAMILY: Symbol; mso-ansi-language: DA">·</SPAN><SPAN
lang=DA
style="FONT-SIZE: 7pt; mso-ansi-language: DA">
</SPAN><SPAN lang=DA style="mso-ansi-language: DA"><FONT size=3>Bean
<o:p></o:p></FONT></SPAN></P>
<P class=doclist
style="MARGIN: auto 0cm auto 36pt; TEXT-INDENT: -18pt"><SPAN lang=DA
style="FONT-SIZE: 10pt; FONT-FAMILY: Symbol; mso-ansi-language: DA">·</SPAN><SPAN
lang=DA
style="FONT-SIZE: 7pt; mso-ansi-language: DA">
</SPAN><SPAN lang=DA style="mso-ansi-language: DA"><FONT
size=3>Logic <o:p></o:p></FONT></SPAN></P>
<P class=doclist
style="MARGIN: auto 0cm auto 36pt; TEXT-INDENT: -18pt"><SPAN lang=DA
style="FONT-SIZE: 10pt; FONT-FAMILY: Symbol; mso-ansi-language: DA">·</SPAN><SPAN
lang=DA
style="FONT-SIZE: 7pt; mso-ansi-language: DA">
</SPAN><SPAN lang=DA style="mso-ansi-language: DA"><FONT
size=3>Template <o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.8"><FONT
size=2><FONT face=宋体>这四个标签库所包含的标签功能各自截然不同，从标签库的名字我们可以看出其功能，如，<SPAN
lang=EN-US>HTML标签库是用来包装HTML控件的。</SPAN></FONT></FONT></P>
<H2 style="MARGIN: 6pt 0cm 3pt; TEXT-INDENT: 0cm"><A
name=_Toc70351664><SPAN lang=EN-US
style="mso-bidi-font-family: 宋体"><SPAN
style="mso-list: Ignore"><FONT face=宋体 size=2>1.3</FONT><SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><FONT size=2><FONT face=宋体>在<SPAN
lang=EN-US>Struts应用中使用标签库</SPAN></FONT></FONT></A></H2>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.8"><FONT
size=2><FONT face=宋体>和使用其它标签库一样，使用<SPAN
lang=EN-US>Struts提供的标签库只需要简单的两步：</SPAN></FONT></FONT></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 36pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 36.0pt"><SPAN
lang=EN-US style="mso-bidi-font-family: 宋体"><SPAN
style="mso-list: Ignore"><FONT face=宋体 size=2>1、</FONT><SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><FONT face=宋体><FONT size=2>在<SPAN
lang=EN-US>web.xml中声明标签库：</SPAN></FONT></FONT></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 20pt; LINE-HEIGHT: normal; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt; mso-pagination: widow-orphan; mso-para-margin-left: 2.0gd"><SPAN
lang=DA
style="LAYOUT-GRID-MODE: both; COLOR: #354278; FONT-FAMILY: 'Courier New'; mso-ansi-language: DA"><FONT
size=2><taglib><o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 20pt; LINE-HEIGHT: normal; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt; mso-pagination: widow-orphan; mso-para-margin-left: 2.0gd"><SPAN
lang=DA
style="LAYOUT-GRID-MODE: both; COLOR: #354278; FONT-FAMILY: 'Courier New'; mso-ansi-language: DA"><FONT
size=2>
<taglib-uri>/WEB-INF/struts-html.tld</taglib-uri><o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 20pt; LINE-HEIGHT: normal; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt; mso-pagination: widow-orphan; mso-para-margin-left: 2.0gd"><FONT
size=2><SPAN lang=DA
style="LAYOUT-GRID-MODE: both; COLOR: #354278; FONT-FAMILY: 'Courier New'; mso-ansi-language: DA">
</SPAN><SPAN lang=EN-GB
style="LAYOUT-GRID-MODE: both; COLOR: #354278; FONT-FAMILY: 'Courier New'; mso-ansi-language: EN-GB"><taglib-location>/WEB-INF/struts-html.tld</taglib-location></SPAN><SPAN
lang=DA
style="LAYOUT-GRID-MODE: both; COLOR: #354278; FONT-FAMILY: 'Courier New'; mso-ansi-language: DA"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 20pt; LINE-HEIGHT: normal; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt; mso-pagination: widow-orphan; mso-para-margin-left: 2.0gd"><SPAN
lang=DA
style="LAYOUT-GRID-MODE: both; COLOR: #354278; FONT-FAMILY: 'Courier New'; mso-ansi-language: DA"><FONT
size=2></taglib><o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 20pt; LINE-HEIGHT: normal; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt; mso-pagination: widow-orphan; mso-para-margin-left: 2.0gd"><SPAN
lang=DA
style="LAYOUT-GRID-MODE: both; COLOR: #354278; FONT-FAMILY: 'Courier New'; mso-ansi-language: DA"><FONT
size=2> <o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 20pt; LINE-HEIGHT: normal; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt; mso-pagination: widow-orphan; mso-para-margin-left: 2.0gd"><SPAN
lang=DA
style="LAYOUT-GRID-MODE: both; COLOR: #354278; FONT-FAMILY: 'Courier New'; mso-ansi-language: DA"><FONT
size=2><taglib><o:p></o:p></FONT></SPAN></P>
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