📄 struts 2与ajax（第一部分） - max on java - blogjava.htm
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style="FONT-SIZE: smaller; FONT-STYLE: italic">清单1
src/tutorial/JsonPluginAction.java</SPAN>
<P>以上代码值得注意的是，通过@JSON的JAVA注释（Annotation），我们可以改变JSON结果的属性名称，另外带有transient修饰符与没有Getter方法的字段（field）都不会被串行化为JSON。</P>
<P>然后，我们来配置一下此Action，代码如下：</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">xml
version="1.0" encoding="UTF-8"</SPAN><SPAN
style="COLOR: #0000ff">?></SPAN><SPAN
style="COLOR: #000000"><BR><BR></SPAN><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><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">package </SPAN><SPAN
style="COLOR: #ff0000">name</SPAN><SPAN
style="COLOR: #0000ff">="Struts2_AJAX_DEMO"</SPAN><SPAN style="COLOR: #ff0000">
extends</SPAN><SPAN style="COLOR: #0000ff">="json-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">="JsonPlugin"</SPAN><SPAN style="COLOR: #ff0000">
class</SPAN><SPAN
style="COLOR: #0000ff">="tutorial.JsonPluginAction"</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: #ff0000">type</SPAN><SPAN
style="COLOR: #0000ff">="json"</SPAN><SPAN style="COLOR: #ff0000"> </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2 src/struts.xml</SPAN>
<P>上面配置文件的“package”元素和以往不同的是，它扩展了“json-default”而不是“struts-default”。“json-default”是在jsonplugin-0.11.jar包里的struts-plugin.xml中定义的。该文件同时定义了“json”的结果类型，有兴趣的朋友可以打开此文件看看。</P>
<P>发布运行应用程序，在浏览器中键入：<A
href="http://localhost:8080/Struts2_Ajax/JsonPlugin.action">http://localhost:8080/Struts2_Ajax/JsonPlugin.action</A>，出现下载文件对话框，原因是JSON插件将HTTP响应（Response）的MIME类型设为“application/json”。把文件下载下来，用记事本打开，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">{</SPAN><SPAN style="COLOR: #000000">"</SPAN><SPAN
style="COLOR: #000000">ISBN</SPAN><SPAN style="COLOR: #000000">"</SPAN><SPAN
style="COLOR: #000000">:</SPAN><SPAN style="COLOR: #000000">15645912</SPAN><SPAN
style="COLOR: #000000">,</SPAN><SPAN style="COLOR: #000000">"</SPAN><SPAN
style="COLOR: #000000">comments</SPAN><SPAN style="COLOR: #000000">"</SPAN><SPAN
style="COLOR: #000000">:[</SPAN><SPAN style="COLOR: #000000">"</SPAN><SPAN
style="COLOR: #000000">It's no bad!</SPAN><SPAN
style="COLOR: #000000">"</SPAN><SPAN style="COLOR: #000000">,</SPAN><SPAN
style="COLOR: #000000">"</SPAN><SPAN style="COLOR: #000000">WOW!</SPAN><SPAN
style="COLOR: #000000">"</SPAN><SPAN style="COLOR: #000000">,</SPAN><SPAN
style="COLOR: #000000">"</SPAN><SPAN style="COLOR: #000000">No
comment!</SPAN><SPAN style="COLOR: #000000">"</SPAN><SPAN
style="COLOR: #000000">],</SPAN><SPAN style="COLOR: #000000">"</SPAN><SPAN
style="COLOR: #000000">price</SPAN><SPAN style="COLOR: #000000">"</SPAN><SPAN
style="COLOR: #000000">:</SPAN><SPAN style="COLOR: #000000">0.9999</SPAN><SPAN
style="COLOR: #000000">,</SPAN><SPAN style="COLOR: #000000"></SPAN><SPAN
style="COLOR: #000000"></SPAN><SPAN style="COLOR: #000000">"</SPAN><SPAN
style="COLOR: #000000">title</SPAN><SPAN style="COLOR: #000000">"</SPAN><SPAN
style="COLOR: #000000">:</SPAN><SPAN style="COLOR: #000000">"</SPAN><SPAN
style="COLOR: #000000">Max On Java</SPAN><SPAN
style="COLOR: #000000">"</SPAN><SPAN style="COLOR: #000000">}</SPAN></DIV><SPAN
style="FONT-SIZE: smaller; FONT-STYLE: italic">清单3 例子1输出的JSON串</SPAN>
<P>当然这还不是一个完整的AJAX的例子，下面让我们写一个HTML文件将其完成，HTML代码如下：</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 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: #ff0000"> </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">JSON
Plugin</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">script
</SPAN><SPAN style="COLOR: #ff0000">type</SPAN><SPAN
style="COLOR: #0000ff">="text/javascript"</SPAN><SPAN
style="COLOR: #0000ff">></SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5"> <BR>
</SPAN><SPAN
style="COLOR: #0000ff; BACKGROUND-COLOR: #f5f5f5">var</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5"> bXmlHttpSupport </SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">=</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5"> (</SPAN><SPAN
style="COLOR: #0000ff; BACKGROUND-COLOR: #f5f5f5">typeof</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5"> XMLHttpRequest </SPAN><SPAN
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