Struts1.x重要类之DispatchAction
在Struts的开发之中DispatchAction有着广泛的应用，应次了解DispatchAction也是很重要的。 DispatchAction是一个抽象的Action,它根据request 中的parameter参数来执行相应的方法。通个这个Action类可以将不同的Action集中到一个Action文件中来。 下面通过实际的代码来了解DispatchAction 1.jsp页面<%@ page language="java" import="java.util.*" pageEncoding="gbk"%><%@ taglib uri="http://struts.apache.org/tags-html" prefix="html"%><html> <head> <title>My JSP 'index.jsp' starting page</title><!--<link rel="stylesheet" type="text/css" href="styles.css">--> </head> <body> <h1>Struts DispatchAction测试</h1><a href='<html:rewrite action="/which_pet_dispatchAction"/>?mymethod=dog'>Dog</a> <a href='<html:rewrite action="/which_pet_dispatchAction"/>?mymethod=bird'>Bird</a> <a href='<html:rewrite action="/which_pet_dispatchAction"/>?mymethod=fish'>fish</a> <a href="javascript:window.location.href='<html:rewrite action="/which_pet_dispatchAction"/>?mymethod=cat'">cat</a> </body></html>DispatchAction的代码package com.struts;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionForward;import org.apache.struts.action.ActionMapping;import org.apache.struts.actions.DispatchAction;public class TestDispatchAction extends DispatchAction {public ActionForward dog(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)throws Exception {request.setAttribute("pet", "dog");return mapping.findForward("result");}public ActionForward bird(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)throws Exception {request.setAttribute("pet", "bird");return mapping.findForward("result");}public ActionForward cat(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)throws Exception {request.setAttribute("pet", "cat");return mapping.findForward("result");}public ActionForward fish(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)throws Exception {request.setAttribute("pet", "fish");return mapping.findForward("result");}} 3.struts的配置文件
<action-mappings><action path="/which_pet_dispatchAction"type="com.struts.TestDispatchAction"scope="request"parameter="mymethod"><forward name="result" path="/WEB-INF/page/showpet.jsp"/></action></action-mappings>4.显示结果的页面showpet.jsp
<%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=GB18030"><title>Insert title here</title></head><body><h1>你养的宠物是：${pet }</h1></body></html> 在运行上面的代码的时候，点击不同的动物，因为URL的参数（mymethod）是各不相同的，struts就根据传过来的参数判断执行不同的方法...
这下struts就知道你养的pet是什么了，呵呵
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