详解Struts2中配置默认Action的方法

发布时间：2020-10-08 10:41:11 来源：脚本之家阅读：146 作者：SIHAIloveYAN 栏目：编程语言

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>

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亿速云。

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