Role of struts.xml file

If you are making a project in struts2 so you must know about the role and responsibility of struts.xml file.

Hello , I am struts.xml file and I am so much proudy because ……

1. If any request comes for serve so without my knowledge and direction, It cannot go further.
2. I am core configuration file for the struts framework and should reside on the classpath of the webapp (most probably  in /WEB-INF/classes folder)
3. I can define the different packages for different module so you can easily find the action request.

Example :

<struts>

<constant name="struts.devMode" value="true" />

<package name="aoiblog" namespace="/aoiblog" extends="struts-default">

 <!-- Add actions here -->

</package>

<package name="aoiblogTwo" namespace="/Two/aoiblog" extends="aoiblog">

 <!-- Add actions here -->

</package>

<!-- Add packages here -->

</struts>

 4. I can also define the namespace so you can get the separate URL for each request serve.

Example :

<package name="aoiblog" namespace="/aoiblog" extends="struts-default">

5.Mostly I am extending the property of struts-default but you can update it to default properties.

Example :

<package name="aoiblog" namespace="/" extends="struts-default">

6.You can break up me in different unlimited xml file but you have to include it in me.

Example :

<struts>

.....

 My Configuration Code

......

<include file="myfile1.xml"/>

<include file="myfile2.xml"/>

.....

 My Configuration Code

.....

</struts>

7. You can define the global error configuration in me.
8.  I have a Interceptors that can preprocess and postprocess a request.
9.  My Action classes that can call business logic (Action Java Class) and data access code
10. I can serve you multiple result as per request define.

Structure of 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.devMode" value="true" />

<package name="aoiblog" namespace="/aoiblog" extends="struts-default">

<action name="HelloWorldAction">

<result>/aoipages/HelloWorld.jsp</result>

</action>

<!-- Add actions here -->

</package>

<!-- Add packages here -->

</struts>

 Hope you like explaination about the struts.xml file. if you have any query so please put your comment so i can revert back to you.