Dinesh on Java

public interface Action {
   public static final String SUCCESS = "success";
   public static final String NONE = "none";
   public static final String ERROR = "error";
   public static final String INPUT = "input";
   public static final String LOGIN = "login";
   public String execute() throws Exception;
}

package com.dineshonjava.struts2.action;

/**
 * @author Dinesh Rajput
 *
 */
public class HelloWorldAction {
 private static final long serialVersionUID = 4956157388836635122L;
 private String name;

    public String execute() throws Exception {
       return "success";
    }  

    public String getName() {
       return name;
    }

    public void setName(String name) {
       this.name = name;
    }
}

To illustrate the point that the action method controls the view, let us make the following change to the execute method and extend the class ActionSupport as follows:

package com.dineshonjava.struts2.action;

import com.opensymphony.xwork2.ActionSupport;

/**
 * @author Dinesh Rajput
 *
 */
public class HelloWorldAction extends ActionSupport {
 private static final long serialVersionUID = 4956157388836635122L;
 private String name;

   public String execute() throws Exception {
            if ("SECRET".equals(name))
            {
                return SUCCESS;
            }else{
               return ERROR;  
            }
          }

    public String getName() {
       return name;
    }

    public void setName(String name) {
       this.name = name;
    }
}

In this example, we have some logic in the execute method to look at the name attribute. If the attribute equals to the string “SECRET”, we return SUCCESS as the result otherwise we return ERROR as the result. Because we have extended ActionSupport, so we can use String constants SUCCESS and ERROR. Now, let us modify our struts.xml file as follows:

<?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="helloworld" extends="struts-default">
      <action name="hello" class="com.dineshonjava.struts2.action.HelloWorldAction" method="execute">
         <result name="success">/success.jsp</result>
          <result name="error">/error.jsp</result>
      </action>
   </package>
 </struts>