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：
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<default-action-ref name="index"></default-action-ref>
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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:
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<?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>
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struts.xml:
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<?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>
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index.jsp:
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<%@ 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>
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二、action默认设置转发
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<!-- 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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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://blog.csdn.net/sihai12345/article/details/73381783