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Struts 2 Action
In struts 2, action class is POJO (Plain Old Java Object). POJO means you are not forced to implement any interface or extend any class. Generally, execute method should be specified that represents the business logic. The simple action class may look like: Welcome.java
- package com.javatpoint;
- public class Welcome {
- public String execute(){
- return "success";
- }
- }
Action Interface
A convenient approach is to implement the com.opensymphony.xwork2.Action interface that defines 5 constants and one execute method.
5 Constants of Action Interface
Action interface provides 5 constants that can be returned form the action class. They are:
- SUCCESS indicates that action execution is successful and a success result should be shown to the user.
- ERROR indicates that action execution is failed and a error result should be shown to the user.
- LOGIN indicates that user is not logged-in and a login result should be shown to the user.
- INPUT indicates that validation is failed and a input result should be shown to the user again.
- NONE indicates that action execution is successful but no result should be shown to the user. Let's see what values are assigned to these constants:
- public static final String SUCCESS = "success";
- public static final String ERROR = "error";
- public static final String LOGIN = "login";
- public static final String INPUT = "input";
- public static final String NONE = "none";
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It is a convenient class that implements many interfaces such as Action, Validateable, ValidationAware, TextProvider, LocaleProvider and Serializable. So it is mostly used instead of Action.
Example of Struts Action that extends ActionSupport
class
Let's see the example of Action class that extends the ActionSupport class. Welcome.java
- package com.javatpoint;
- import com.opensymphony.xwork2.ActionSupport;
- public class Welcome extends ActionSupport{
- public String execute(){
- return SUCCESS;
- }
- } JEE Mains Coaching At AhaGuru Start Learning Now
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