Struts

ModelDriven interceptor work is association in with ModelDriven Interface which is provided by framework i.e if an action wants to push a model object into the valuestack with the help of ModelDriven interceptor then it need to implements ModelDriven interface. This interface provide one method getModel().

public Object getModel();

Source Code:

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>f1</filter-name>
<filter-class>org.apache.struts2.dispatcher
.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>f1</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>

index.jsp

<%@taglib uri="/struts-tags" prefix="s"%>
<s:form action="register">
<s:textfield name="user.name" 
label="Name"/>
<s:textfield name="user.mailId"
label="MailID"/>
<s:textfield name="city" label="City"/>
<s:textfield name="state" label="State"/>
<s:submit value="Register"/>
</s:form>

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC 
"-//Apache Software Foundation
//DTD Struts Configuration 2.1//EN"
"http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<package name="demo" extends="struts-default">
<action name="register"
class="org.r4r.RegisterAction">
<result name="success">/hello.jsp</result>
</action>
</package>
</struts>

Address.java

package mypack;
public class Address {
String city,state;
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
}

RegisterAction.java

package mypack;
import com.opensymphony.xwork2.ModelDriven;
public class RegisterAction implements
	ModelDriven<Address> {
User user;
public Address getModel(){
user=new User();
return user.getAddress();
}
public String execute()
{
return "success";
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}

User.java

package mypack;
public class User {
String name;
String mailId;
Address address;
public User(){
address=new Address();
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getMailId() {
return mailId;
}
public void setMailId(String mailId) {
this.mailId = mailId;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
}

hello.jsp

<%@ taglib uri="/struts-tags" prefix="s"%>
<b>You are successfully registered
with following detailes.
<br>Name:<s:property value="user.name"/>
<br>MailID:<s:property value="user.mailId"/>
<br>City:<s:property value="city"/>
<br>State:<s:property value="state"/>