Struts1.x系列教程（21）：使用MappingDispatchAction类调用不同的Action方法

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与LookupDispatchAction、DispatchAction不同，MappingDispatchAction类并不通过请求参数来指定动作，而是将一个Struts动作对应于一个Action方法。下面的例子演示了如何使用MappingDispatchAction类来将Struts动作和Action方法相对应。

<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta name="ProgId" content="Word.Document"> <meta name="Generator" content="Microsoft Word 11"> <meta name="Originator" content="Microsoft Word 11"> <link rel="File-List" href="file:///C:%5CDOCUME%7E1%5CADMINI%7E1%5CLOCALS%7E1%5CTemp%5Cmsohtml1%5C01%5Cclip_filelist.xml"> <!--[if gte mso 9]><xml> Normal 0 7.8 磅 0 2 false false false MicrosoftInternetExplorer4 </xml><![endif]--><!--[if gte mso 9]><![endif]--><style> <!-- /* Font Definitions */ &#64;font-face {font-family:宋体; panose-1:2 1 6 0 3 1 1 1 1 1;} &#64;font-face {font-family:""&#64;宋体"; panose-1:2 1 6 0 3 1 1 1 1 1;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; text-align:justify; text-justify:inter-ideograph; font-size:10.5pt; font-family:"Times New Roman";} /* Page Definitions */ &#64;page {} &#64;page Section1 {size:612.0pt 792.0pt; margin:72.0pt 90.0pt 72.0pt 90.0pt;} div.Section1 {page:Section1;} --> </style> <!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable { mso-style-parent:""; font-size:10.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";} </style> <![endif]-->

Action类的实现代码：

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --> package action;
import org.apache.struts.actions.MappingDispatchAction;

public class MyMappingDispatchAction extends MappingDispatchAction
{
public ActionForwardpdf(ActionMappingmapping,ActionFormform,
HttpServletRequestrequest,HttpServletResponseresponse) throws IOException,ServletException
{
// 生成pdf文件
}
public ActionForwardhtml(ActionMappingmapping,ActionFormform,
HttpServletRequestrequest,HttpServletResponseresponse) throws IOException,ServletException
{
// 生成html文件
}
public ActionForwardunspecified(ActionMappingmapping,ActionFormform,
HttpServletRequestrequest,HttpServletResponseresponse) throws IOException,ServletException
{
// 处理默认动作
}
}

<meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta name="ProgId" content="Word.Document"><meta name="Generator" content="Microsoft Word 11"><meta name="Originator" content="Microsoft Word 11"><link rel="File-List" href="file:///C:%5CDOCUME%7E1%5CADMINI%7E1%5CLOCALS%7E1%5CTemp%5Cmsohtml1%5C01%5Cclip_filelist.xml"><!--[if gte mso 9]><xml> Normal 0 7.8 磅 0 2 false false false MicrosoftInternetExplorer4 </xml><![endif]--><!--[if gte mso 9]><![endif]--><style> <!-- /* Font Definitions */ &#64;font-face {font-family:宋体; panose-1:2 1 6 0 3 1 1 1 1 1;} &#64;font-face {font-family:""&#64;宋体"; panose-1:2 1 6 0 3 1 1 1 1 1;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; text-align:justify; text-justify:inter-ideograph; font-size:10.5pt; font-family:"Times New Roman";} /* Page Definitions */ &#64;page {} &#64;page Section1 {size:612.0pt 792.0pt; margin:72.0pt 90.0pt 72.0pt 90.0pt;} div.Section1 {page:Section1;} --> </style><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable { mso-style-parent:""; font-size:10.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";} </style> <![endif]-->

上面的代码有两个Action方法：pdf和html，分别用来生成pdf和html文件。还有一个unspecified方法用来处理默认动作。
我们可以使用如下的代码来配置MyMappingDispatchAction类：

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --> < action path ="/pdf" type ="action.MyMappingDispatchAction" parameter ="pdf" />
< action path ="/html" type ="action.MyMappingDispatchAction" parameter ="html" />

可以通过如下的URL来访问pdf和html动作，分别会调用MyMappingDispatchAction类的pdf和html方法：

http://localhost:8080/samples/pdf.do

http://localhost:8080/samples/html.do


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