📄 在struts 2中实现ioc - max on java - blogjava.htm
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<SPAN style="COLOR: #0000ff">></SPAN> </DIV><SPAN
style="FONT-SIZE: smaller; FONT-STYLE: italic">清单6
WEB-INF\applicationContext.xml</SPAN>
<P>上述代码有二点值得大家注意的：</P>
<OL>
<LI>Struts
2会为每一个请求创建一个Action对象，所以在定义chatAction时，使用scope="prototype"。这样Spring就会每次都返回一个新的ChatAction对象了；
<LI>因为ChatServiceImpl被配置为默认的scope（也即是singleton，唯一的），所以在实现时应保证其线程安全（关于编写线程安全的代码的讨论已经超出本文的范围，更超出了本人的能力范围，大家可以参考Addison
Wesley Professional出版的《<A
href="http://www.amazon.com/Java-Concurrency-Practice-Brian-Goetz/dp/0321349601">Java
Concurrency in Practice</A>》）。 </LI></OL>
<P>接下来，在classes/struts.xml中配置Action，内容如下：</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: #0000ff"><!</SPAN> <SPAN style="COLOR: #ff00ff">DOCTYPE struts
PUBLIC<BR> "-//Apache Software Foundation//DTD Struts
Configuration 2.0//EN"<BR>
"http://struts.apache.org/dtds/struts-2.0.dtd"</SPAN> <SPAN
style="COLOR: #0000ff">></SPAN> <SPAN style="COLOR: #000000"><BR></SPAN><SPAN
style="COLOR: #0000ff"><</SPAN> <SPAN style="COLOR: #800000">struts</SPAN>
<SPAN style="COLOR: #0000ff">></SPAN> <SPAN style="COLOR: #000000"><BR>
</SPAN><SPAN style="COLOR: #0000ff"><</SPAN> <SPAN
style="COLOR: #800000">include </SPAN><SPAN style="COLOR: #ff0000">file</SPAN>
<SPAN style="COLOR: #0000ff">="struts-default.xml"</SPAN> <SPAN
style="COLOR: #0000ff">/></SPAN> <SPAN style="COLOR: #000000">
<BR> <BR> </SPAN><SPAN
style="COLOR: #0000ff"><</SPAN> <SPAN style="COLOR: #800000">package
</SPAN><SPAN style="COLOR: #ff0000">name</SPAN> <SPAN
style="COLOR: #0000ff">="Struts2_IoC"</SPAN> <SPAN
style="COLOR: #ff0000">extends</SPAN> <SPAN
style="COLOR: #0000ff">="struts-default"</SPAN> <SPAN
style="COLOR: #0000ff">></SPAN> <SPAN style="COLOR: #000000"><BR>
</SPAN><SPAN style="COLOR: #0000ff"><</SPAN> <SPAN
style="COLOR: #800000">action </SPAN><SPAN style="COLOR: #ff0000">name</SPAN>
<SPAN style="COLOR: #0000ff">="Chat"</SPAN> <SPAN
style="COLOR: #ff0000">class</SPAN> <SPAN
style="COLOR: #0000ff">="chatAction"</SPAN> <SPAN
style="COLOR: #0000ff">></SPAN> <SPAN style="COLOR: #000000"><BR>
</SPAN><SPAN
style="COLOR: #0000ff"><</SPAN> <SPAN style="COLOR: #800000">result</SPAN>
<SPAN style="COLOR: #0000ff">></SPAN> <SPAN
style="COLOR: #000000">/UserList.jsp</SPAN> <SPAN
style="COLOR: #0000ff"></</SPAN> <SPAN style="COLOR: #800000">result</SPAN>
<SPAN style="COLOR: #0000ff">></SPAN> <SPAN style="COLOR: #000000"><BR>
</SPAN><SPAN style="COLOR: #0000ff"></</SPAN> <SPAN
style="COLOR: #800000">action</SPAN> <SPAN style="COLOR: #0000ff">></SPAN>
<SPAN style="COLOR: #000000"><BR> </SPAN><SPAN
style="COLOR: #0000ff"></</SPAN> <SPAN style="COLOR: #800000">package</SPAN>
<SPAN style="COLOR: #0000ff">></SPAN> <SPAN style="COLOR: #000000">
<BR></SPAN><SPAN style="COLOR: #0000ff"></</SPAN> <SPAN
style="COLOR: #800000">struts</SPAN> <SPAN style="COLOR: #0000ff">></SPAN>
</DIV><SPAN style="FONT-SIZE: smaller; FONT-STYLE: italic">清单7
classes\struts.xml</SPAN>
<P>这里的Action和平常不同的就是class属性，它对应于Spring所定义的bean的id，而不是它的类全名。</P>
<P>最后，让我们看看/UserList.jsp，内容如下：</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
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></SPAN><SPAN style="COLOR: #0000ff"><</SPAN> <SPAN
style="COLOR: #800000">html</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">User List</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">head</SPAN> <SPAN
style="COLOR: #0000ff">></SPAN> <SPAN
style="COLOR: #000000"><BR><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: #000000">User List</SPAN> <SPAN
style="COLOR: #0000ff"></</SPAN> <SPAN style="COLOR: #800000">h2</SPAN> <SPAN
style="COLOR: #0000ff">></SPAN> <SPAN style="COLOR: #000000"><BR>
</SPAN><SPAN style="COLOR: #0000ff"><</SPAN> <SPAN
style="COLOR: #800000">ol</SPAN> <SPAN style="COLOR: #0000ff">></SPAN> <SPAN
style="COLOR: #000000"><BR> </SPAN><SPAN
style="COLOR: #0000ff"><</SPAN> <SPAN style="COLOR: #800000">s:iterator
</SPAN><SPAN style="COLOR: #ff0000">value</SPAN> <SPAN
style="COLOR: #0000ff">="userNames"</SPAN> <SPAN
style="COLOR: #0000ff">></SPAN> <SPAN style="COLOR: #000000"><BR>
</SPAN><SPAN style="COLOR: #0000ff"><</SPAN> <SPAN
style="COLOR: #800000">li</SPAN> <SPAN style="COLOR: #0000ff">><</SPAN>
<SPAN style="COLOR: #800000">s:property </SPAN><SPAN
style="COLOR: #0000ff">/></</SPAN> <SPAN style="COLOR: #800000">li</SPAN>
<SPAN style="COLOR: #0000ff">></SPAN> <SPAN style="COLOR: #000000"><BR>
</SPAN><SPAN style="COLOR: #0000ff"></</SPAN> <SPAN
style="COLOR: #800000">s:iterator</SPAN> <SPAN
style="COLOR: #0000ff">></SPAN> <SPAN style="COLOR: #000000"><BR>
</SPAN><SPAN style="COLOR: #0000ff"></</SPAN> <SPAN
style="COLOR: #800000">ol</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">html</SPAN>
<SPAN style="COLOR: #0000ff">></SPAN> </DIV><SPAN
style="FONT-SIZE: smaller; FONT-STYLE: italic">清单8 /UserList.jsp</SPAN>
<P>大功告成，分布运行应用程序，在浏览器中键入<A
href="http://localhost:8080/Struts2_IoC/Chat.action">http://localhost:8080/Struts2_IoC/Chat.action</A>，出现如图2所示页面：</P>
<P><IMG alt="图2 /ListUser.jsp"
src="在Struts 2中实现IoC - Max On Java - BlogJava.files/r_pic2.gif"> <BR><SPAN
style="FONT-SIZE: smaller; FONT-STYLE: italic">图2 /ListUser.jsp</SPAN> </P>
<H2>总结</H2>
<P>通过Spring在Struts 2上实现控制反转是强烈推荐的做法，当然您也可以组合其它的实现（如Pico等）。</P>
<DIV class=postDesc>posted on 2006-12-28 17:37 <A
href="http://www.blogjava.net/max/">Max</A> 阅读(5395) <A
href="http://www.blogjava.net/max/archive/2006/12/28/90548.html#Post">评论(74)</A>
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<DIV class=feedbackListSubtitle><A title="permalink: re: 在Struts 2中实现IoC"
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