详解Struts2中配置默认Action的方法

2024-07-13 10:16:37

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一、jsp默认设置

1、当访问的Action不存在时，页面会显示错误信息，可以通过配置默认Action处理用户异常的操作；

2。配置方法：

在struts.xml文件中的下添加如下内容：

<default-action-ref name="index"></default-action-ref>

其中index为默认Action的name属性值；

3、配置默认Action后，相应的namespace下不存在要访问的Action时，自动跳转到默认Action处理。

4、实例

web.xml:

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5"  xmlns="http://java.sun.com/xml/ns/javaee"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee ; http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <welcome-file-list> <welcome-file>hello.jsp</welcome-file> </welcome-file-list> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping></web-app>

struts.xml:

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"><struts> <!--  <constant name="struts.enable.DynamicMethodInvocation" value="false" /> <constant name="struts.devMode" value="false" /> <include file="example.xml"/> <package name="default" namespace="/" extends="struts-default">  <default-action-ref name="index" />  <action name="index">   <result type="redirectAction">    <param name="actionName">HelloWorld</param>    <param name="namespace">/example</param>   </result>  </action> </package>  --> <!-- Add packages here --> <constant name="struts.devMode" value="true" /> <constant name="struts.i18n.encoding" value="GBK"></constant>  <package name="user" namespace="/" extends="struts-default">   <default-action-ref name="index"></default-action-ref>  <action name="index">   <result>/index.jsp</result>  </action> </package></struts>

index.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <base href="<%=basePath%>" rel="external nofollow" > <title>Index</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0">  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" > --> </head> <body> Welcome to Magci's BLOG!<br /> <a href="magci/magc" rel="external nofollow" >magci/magc</a><br /> <a href="mgc/magc/magci/123456" rel="external nofollow" >mgc/magc/magci/123456</a><br /> </body></html>

二、action默认设置转发

<!-- 默认action -->  <default-action-ref name="index" />  <action name="index">   <result type="redirectAction">    <param name="actionName">page_toIndex</param>    <!-- <param name="namespace">/example</param> -->   </result>  </action>  <action name="page_*" class="indexAction" method="{1}">   <result name="toIndex">/WEB-INF/jsps/index.jsp</result>   <result name="toAdminLogin">/WEB-INF/jsps/admin/admin_login.jsp</result>   <!-- ajax -->   <result name="ajaxInsertOneCallback" type="json">    <param name="root">action</param>   </result>  </action>

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