Multiple configuration file in Struts 2

✔ STRUTS 2 CHAPTERS:-

1. Struts2 Overview
2. Struts2 Architecture
3. Struts2 Configuration Files
4. Action in Struts2
5. Action in Struts2 by using Pojo Class
6. Action in struts2 by Implementing Action Interface
7. Action in Struts2 by Extending Action Support Class
8. Struts2 Hello World Example
9. Multiple Configuration File in Struts2
10. OGNL in Struts2
11. Value Stack in Struts2
12. Interceptors in Struts2
13. Struts2 Execandwait Interceptor
14. Struts2 Custom Interceptor
15. Struts2 Result type
16. Struts2 Redirect result type
17. Struts2 Validation Framework
18. Struts2 Validation by Built in validators
19. Struts2 i18n
20. Struts2 Zero Configuration by convention approach
21. Struts2 Zero Configuration by annotation Approach
22. Dispatch Action Functionality in Struts2
23. Dynamic method invocation in Struts2
24. Struts2 UI Tags
25. Struts2 Control Tags
26. Struts2 Data Tags
27. Struts2 and tiles integration
28. Struts2 and Quartz2 Schedular
29. Struts2 Interview Questions and Answers

We can break struts.xml file into multiple small files. At runtime there can be only one struts.xml for an application so other files have to be included in the default struts.xml file.

Syntax:

<struts>
       //Other attributes
      <include file="strutsfile1.xml"/>
      <include file="strutsfile2.xml"/>
      //Other attributes
</struts>

Example:

login.jsp

<%@ taglib uri="/struts-tags" prefix="s"%>
 
<html>
 <head>
   <title>Struts 2 Multiple Struts configuration files example</title>
 </head>
 <body>
 <h3>This is a Multiple Struts configuration files example.</h3>
 
 <h4>For Admin page <a href="adminUser" >click here</a>.</h4>
 <h4>For User page <a href="normalUser" >click here</a>.</h4>
 
 </body>
</html>

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">
 
 
  <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>
 
 <welcome-file-list>
   <welcome-file>login.jsp</welcome-file>
 </welcome-file-list>
 
</web-app>

struts.xml

<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
 
<struts>
 
 <package name="user" extends="struts-default">  
 </package>
 
 <include file="struts-admin.xml"></include>
 <include file="struts-user.xml"></include>
 
</struts>

struts-admin.xml

<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
 
<struts>
 
 <package name="adminUser" extends="struts-default">
  <action name="adminUser" 
     class="com.javawithease.action.AdminUser">
   <result name="success">/admin.jsp</result>
  </action>
 </package>
 
</struts>

struts-user.xml

<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
 
<struts>
 
 <package name="normalser" extends="struts-default">
  <action name="normalUser" 
      class="com.javawithease.action.NormalUser">
   <result name="success">/user.jsp</result>
  </action>
 </package>
 
</struts>

AdminUser.java

/**
 * This class is used as an action class for Admin User.
 * @author javawithease
 */
public class AdminUser{
 //data member
 private String message;
 
 //business logic
 public String execute(){
  setMessage("Hello Admin.");
  return "success"; 
 } 
 
 //getter setters
 public String getMessage() {
  return message;
 }
 public void setMessage(String message) {
  this.message = message;
 }
}

NormalUser.java

/**
 * This class is used as an action class for normal User.
 * @author javawithease
 */
public class NormalUser{
 //data member
 private String message;
 
 //business logic
 public String execute(){
  setMessage("Hello user.");
  return "success"; 
 } 
 
 //getter setters
 public String getMessage() {
  return message;
 }
 public void setMessage(String message) {
  this.message = message;
 }
}

admin.jsp

<%@ taglib uri="/struts-tags" prefix="s"%>
 
<html>
  <head>
    <title>Struts 2 Multiple Struts configuration files example</title>
  </head>
  <body>
     <h3>This is a Multiple Struts configuration files example.</h3>
     <s:property value="message" />  
  </body>
</html>

user.jsp

<%@ taglib uri="/struts-tags" prefix="s"%>
<html>
 <head>
   <title>Struts 2 Multiple Struts configuration files example</title>
 </head>
 <body>
   <h3>This is a Multiple Struts configuration files example.</h3>
   <s:property value="message" />  
 </body>
</html>