问题
This site doesn\'t allow user to ask technical questions to their tutorial which I believe is broken:
http://www.mkyong.com/misc/how-to-use-mkyong-tutorial/
I\'m using:
- maven: 3.2.1
- tomcat 7
- java 1.7
- Eclipse: Luna Release (4.4.0)
I\'m getting this message:
WARNING: Could not find action or result
There is no Action mapped for namespace [/] and action name [] associated with context path [/Struts2Example]. - [unknown location]
I can never get to the login.jsp page unless I enter the full url. But even then, when I click on the submit button, it doesn\'t go to the welcome_user.jsp page either.
Can someone tell me how I can fix this and get this Hello World example to work in using Eclipse?
回答1:
If you follow the tutorial, which is linked to the page Struts 2 Hello World Example, and done everything till p. 7 then you should Run it as is written
In Struts2, you can access the action class directly with a suffix of .action.
http://localhost:8080/Struts2Example/User/Login.action
If you tried to access application as
http://localhost:8080/Struts2Example
you will get a message and 404 error code is returned to the browser.
WARNING: Could not find action or result There is no Action mapped for namespace [/] and action name [] associated with context path [/Struts2Example]. - [unknown location]
The workaround is to add the file to the web root folder that will redirect a browser to the correct location.
index.html:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<META HTTP-EQUIV="Refresh" CONTENT="0;URL=User/Login.action">
</head>
<body>
<p>Loading ...</p>
</body>
</html>
Also modify web application deployment descriptor to include this file name to the welcome files list.
web.xml:
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
That's it, if you are looking for the Hello World tutorial, you should use these references:
- Hello World
- Hello World Using Struts 2
- How To Create A Struts 2 Web Application
- Create Struts 2 Web Application Using Maven To Manage Artifacts and To Build The Application
来源：https://stackoverflow.com/questions/25373228/unable-to-get-struts2-hello-world-to-work-using-eclipse-and-maven