1. MappingDispatchAction的作用域LookupAction的作用差不多相同，但是在应用上稍微有些差别。
1.Struts-config.xml
<action path=
"/mapping-invalid"
type= "org.apache.struts.webapp.dispatch.MappingDispatchExampleAction"
parameter= "doInvalid"
name= "testForm"
scope= "request">
<exception key= "dispatch.NoSuchMethodException"
type= "java.lang.NoSuchMethodException"
path= "/mapping.jsp"/>
<exception key= "dispatch.ServletException"
type= "javax.servlet.ServletException"
path= "/mapping.jsp"/>
<forward name= "success" path= "/mapping.jsp"/>
</action>
<action path= "/mapping-execute"
type= "org.apache.struts.webapp.dispatch.MappingDispatchExampleAction"
parameter= "execute"
name= "testForm"
scope= "request">
<exception key= "dispatch.NoSuchMethodException"
type= "java.lang.NoSuchMethodException"
path= "/mapping.jsp"/>
<exception key= "dispatch.ServletException"
type= "javax.servlet.ServletException"
path= "/mapping.jsp"/>
<forward name= "success" path= "/mapping.jsp"/>
</action>
<action path= "/mapping-noparam"
type= "org.apache.struts.webapp.dispatch.MappingDispatchExampleAction"
name= "testForm"
scope= "request">
<exception key= "dispatch.ServletException"
type= "javax.servlet.ServletException"
path= "/mapping.jsp"/>
<forward name= "success" path= "/mapping.jsp"/>
</action>
type= "org.apache.struts.webapp.dispatch.MappingDispatchExampleAction"
parameter= "doInvalid"
name= "testForm"
scope= "request">
<exception key= "dispatch.NoSuchMethodException"
type= "java.lang.NoSuchMethodException"
path= "/mapping.jsp"/>
<exception key= "dispatch.ServletException"
type= "javax.servlet.ServletException"
path= "/mapping.jsp"/>
<forward name= "success" path= "/mapping.jsp"/>
</action>
<action path= "/mapping-execute"
type= "org.apache.struts.webapp.dispatch.MappingDispatchExampleAction"
parameter= "execute"
name= "testForm"
scope= "request">
<exception key= "dispatch.NoSuchMethodException"
type= "java.lang.NoSuchMethodException"
path= "/mapping.jsp"/>
<exception key= "dispatch.ServletException"
type= "javax.servlet.ServletException"
path= "/mapping.jsp"/>
<forward name= "success" path= "/mapping.jsp"/>
</action>
<action path= "/mapping-noparam"
type= "org.apache.struts.webapp.dispatch.MappingDispatchExampleAction"
name= "testForm"
scope= "request">
<exception key= "dispatch.ServletException"
type= "javax.servlet.ServletException"
path= "/mapping.jsp"/>
<forward name= "success" path= "/mapping.jsp"/>
</action>
主要的工作就是在这里。只不过不同的url 都是指到同一个Action中。使用【parameter】参数来表示不同的url 以访问Action中不同的方法，实现不同的业务逻辑。
2.然后在JSP 前台页面中，分别提交
<html:form action=
"mapping-foo" style=
"display:inline">
<html:submit><bean:message key= "button.foo.label" /></html:submit>
</html:form>
<html:form action= "mapping-bar" style= "display:inline">
<html:submit><bean:message key= "button.bar.label" /></html:submit>
</html:form>
<html:form action= "mapping-invalid" style= "display:inline">
<html:submit><bean:message key= "button.invalid.label" /></html:submit>
</html:form>
<html:form action= "mapping-execute" style= "display:inline">
<html:submit><bean:message key= "method.execute.label" /></html:submit>
</html:form>
<html:form action= "mapping-noparam" style= "display:inline">
<html:submit><bean:message key= "parameter.missing.label" /></html:submit>
</html:form>
<html:submit><bean:message key= "button.foo.label" /></html:submit>
</html:form>
<html:form action= "mapping-bar" style= "display:inline">
<html:submit><bean:message key= "button.bar.label" /></html:submit>
</html:form>
<html:form action= "mapping-invalid" style= "display:inline">
<html:submit><bean:message key= "button.invalid.label" /></html:submit>
</html:form>
<html:form action= "mapping-execute" style= "display:inline">
<html:submit><bean:message key= "method.execute.label" /></html:submit>
</html:form>
<html:form action= "mapping-noparam" style= "display:inline">
<html:submit><bean:message key= "parameter.missing.label" /></html:submit>
</html:form>
这跟表单提交的目标地址，实现访问同一个Action中不同的方法。
1、发生的异常 和 LookupDispatcherAction、DispatcherAction的异常一致。
本文转自 randy_shandong 51CTO博客，原文链接：http://blog.51cto.com/dba10g/240832，如需转载请自行联系原作者
