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Struts2中配置默认Action
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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<package>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。
实例：
web.xml:
01.
<?
xml
version
=
"1.0"
encoding
=
"UTF-8"
?>
02.
<
web-app
version
=
"2.5"
03.
xmlns
=
"http://java.sun.com/xml/ns/javaee"
04.
xmlns:xsi
=
"http://www.w3.org/2001/XMLSchema-instance"
05.
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee;
06.
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
07.
<
welcome-file-list
>
08.
<
welcome-file
>hello.jsp</
welcome-file
>
09.
</
welcome-file-list
>
10.
<
filter
>
11.
<
filter-name
>struts2</
filter-name
>
12.
<
filter-class
>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</
filter-class
>
13.
</
filter
>
14.
<
filter-mapping
>
15.
<
filter-name
>struts2</
filter-name
>
16.
<
url-pattern
>/*</
url-pattern
>
17.
</
filter-mapping
>
18.
</
web-app
>
struts.xml:
01.
<?
xml
version
=
"1.0"
encoding
=
"UTF-8"
?>
02.
<!DOCTYPE struts PUBLIC
03.
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
04.
"http://struts.apache.org/dtds/struts-2.0.dtd">
05.
06.
<
struts
>
07.
<!--
08.
<
constant
name
=
"struts.enable.DynamicMethodInvocation"
value
=
"false"
/>
09.
<
constant
name
=
"struts.devMode"
value
=
"false"
/>
10.
11.
<
include
file
=
"example.xml"
/>
12.
13.
14.
15.
<
package
name
=
"default"
namespace
=
"/"
extends
=
"struts-default"
>
16.
<
default-action-ref
name
=
"index"
/>
17.
<
action
name
=
"index"
>
18.
<
result
type
=
"redirectAction"
>
19.
<
param
name
=
"actionName"
>HelloWorld</
param
>
20.
<
param
name
=
"namespace"
>/example</
param
>
21.
</
result
>
22.
</
action
>
23.
</
package
>
24.
-->
25.
27.
<
constant
name
=
"struts.devMode"
value
=
"true"
/>
28.
<
constant
name
=
"struts.i18n.encoding"
value
=
"GBK"
></
constant
>
26.
<!-- 注意添加在这里-->
29.
<
package
name
=
"user"
namespace
=
"/"
extends
=
"struts-default"
>
30.
<
default-action-ref
name
=
"index"
></
default-action-ref
>
31.
<
action
name
=
"index"
>
32.
<
result
>/index.jsp</
result
>
33.
</
action
>
34.
</
package
>
35.
</
struts
>
index.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
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%>">
<title>My JSP 'index.jsp' starting page</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">
-->
</head>
<body>
result结果类型<br>
<ol>
<li><a href="r/r1">dispatcher</a></li>
<li><a href="r/r2">redirect</a></li>
<li><a href="r/r3">chain</a></li>
<li><a href="r/r4">redirectAction</a></li>
</ol>
</body>
</html>
截图：
好了！
