In struts2, & lt; welcome-file & gt; index. action & lt;/welcome-file & gt; directly sets the action, solution of 404, and struts2action404.

In struts2, <welcome-file> index. action </welcome-file> directly sets action, solution of 404, struts2action404

In the past few days, the access to the project page is changed to. action access, and a problem occurs when you modify the home page. Modify <welcome-file> index. action </welcome-file> in the web. xml file to this way. When you access the home page, the system reports a 404 error, which means the file cannot be found. There are two solutions for online query.
Method 1: Create an empty index. action file under WebRoot. This method is simple and practical and is strongly recommended.
Method 2: Because the welcome-file must be an existing file, not an action or servlet Path, you can set a goindex such as <welcome-file>. jsp </welcome-file>, and then goindex. jsp write <jsp: forward page = "index. action "/>. This means that a jsp page is used to forward requests to the action.

Method 3: Use META redirection in index.html.

Actions: <META HTTP-EQUIV = "Refresh" CONTENT = "0; URL = max/HelloWorld. action">

Where,

Content = "1 is the time control, indicating that the page to jump is automatically redirected in 1 second.
Content = "0" indicates that the page will jump to the page you want to jump to immediately.
Url is the path to jump

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In struts2, it is also very special:

Cause:

Struts2 uses a filter to process requests. By default, it monitors url address changes.

The following operations are required:

Step 1:
Modify in web. xml
<Filter-mapping>
<Filter-name> struts2 </filter-name>
<Url-pattern>/* </url-pattern>
<Dispatcher> REQUEST </dispatcher>
<Dispatcher> FORWARD </dispatcher>
</Filter-mapping>
Step 2:
Add in web. xml
<Welcome-file-list>
<Welcome-file> index. jsp </welcome-file>
</Welcome-file-list>
Step 3:
Homepage jump statement
The content of index. jsp is as follows:
<Jsp: forward page = "HelloWorld. action"> </jsp: forward>

Or use method 3 !!!

From: http://blog.sina.com.cn/s/blog_4b5bc0110100yrn2.html

How does struts1 configure <welcome file> to access the Action object?

<Action name = "index. do "....
<Wel...> index. do </

How to call action when Struts2 enters the homepage?

There are two ways to achieve this!
1. Create an empty jsp page with the page content
Response. sendRedirect ("/index! Index. action!
<Welcome-file-list>
<Welcome-file> here is your jsp file </welcome-file>
</Welcome-file-list>
2. Create an empty file name under WEB-ROOT as the name of your action (index like this! Index. action as the file name)

<Welcome-file-list>
<Welcome-file> index! Index. action </welcome-file>
</Welcome-file-list>
In this way, you can find your action!
. Do is the same! Understand