LookupDispatchAction的使用
LookupDispathcAction主要用于一个表单有多个按钮，而这写表单又有相同的name属性时，使用。
1、定义ExtendLookupDispatchAction类
package com.sunrex.demo08.action;
import java.util.HashMap;
import java.util.Map;
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.LookupDispatchAction;
public class ExtendLookupDispatchAction extends LookupDispatchAction {
public ActionForward addItem(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
return mapping.findForward("addItem");
}
public ActionForward list(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
return mapping.findForward("list");
}
@Override
protected Map<String, String> getKeyMethodMap() {
Map<String, String> maps = new HashMap<String, String>();
maps.put("submit.addItem", "addItem");
maps.put("submit.list", "list");
return maps;
}
}
2、定义ApplicationMessages.properties文件
submit.addItem=addItem submit.list=list
3、配置struts-config.xml文件
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"
"http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">
<struts-config>
<action-mappings>
<action path="/lookup"
type="com.sunrex.demo08.action.ExtendLookupDispatchAction"
scope="request"
parameter="method"
>
<forward name="addItem" path="/demo08/addItem.jsp"/>
<forward name="list" path="/demo08/list.jsp"/>
</action>
</action-mappings>
<message-resources key="demo08"
parameter="com.sunrex.demo08.ApplicationMessages"/>
</struts-config>
4、定义index.jsp页面
<%@ 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>
<form action="../lookup.do" method="post">
名：<input type="text" name="username"><br>
<input type="submit" name="method" value="addItem">
<input type="submit" name="method" value="list">
</form>
</body>
</html>
注意以上jsp文件中的两个按钮的name为method，他与struts-config.xml中action标签下的parameter的值对应
点击addItem按钮，就访问ExtendLookupDispatchAction类中的addItem方法，而list会使用ExtendLookupDispatchAction中的list方法