The URL part after the context root of the web application is as follows. Action class is used to provide an interface to application model layer. This instructs struts 2 to scan all packages [and classes in them] under com package and look for struts action classes fulfilling the contract for struts action class.
The action class name is considered excluding the Action [in the end] and the first letter is converted into a lower case. ActionSupporta very powerful and convenience class that provides default implementation of few of the important interfaces: The action class contains business logic, retrieve resource bundle, hold the data, validation, and select the view result page that should send back to the user.
The project structure is as shown in the below screenshot. Action annotation Struts 2 has very good support for annotations, you can get rid of the XML file and replace with action in your action class. We end the class name with Action to inform struts that this Java file should be considered as a Struts 2 Action.
The first is to configure in struts. Define which result page should return to the user with result tag and the name of the action you can use to access this action class with name attribute.
It is very simple and has one line of text saying "The content of second. Override the following method public ActionForward execute ActionMapping mapping.
For example, Action class can create a library object add books to that library object, it can store selected books by a specific reader to the session. We have mentioned the value of actionPackages as com. So I have copied airlines. Validation — Declared a validate method and put the validation code inside.
First extend the org. ActionSupport Support class, a common practice to provide default implementations of interfaces. Include the folder names after the actionPackages parameter mentioned in web.
Download the free trial. In brief, we can describe Action as: We will follow the second way to configure through annotation. Now the action class can use the constant value directly. This tutorial is a continuation of Setup web application using spring Struts 2 and Maven with Eclipse 3.
This is also a very good learning class to understand how to do the implementation of some of the important Struts 2 interfaces. Logic involved in constructing the URL to invoke the action: What is Struts Action Class in Java J2EE - How to use What is Action class in Struts Struts in java is a framework, used to make web application its is based on Model View Controller or MVC design Pattern where Model represent the internal state and action used to change the state view represent presentation component and a controller is responsible for receiving the request from the client and decide which business logic should be called.
Text localization — Use GetText method to get the message from resource bundle. By implements this interface, it bring some convenient benefits, see the source code: I have my Tomcat 6 installed in E: But for now let us copy the airlines. Read More From DZone. June 11, Viewed: Action Class in Struts framework is used to define the business logic it handles the client request prepare the response or tell where the response should be forward, basically its receive the data from the view layer and forward that data to specific business layer or process the data and again forward the processed data to view layer.Struts 2 select> example.
A full Struts 2 example to create drop down box via select>, and populate the select options via Java list and OGNL list, stored the selected values and display it in another page.
1. Action. Action class to generate and hold the selected drop down box options. killarney10mile.com In Struts 1 you had to extend the ActionForm class in any class you wanted to use as a form bean.
This requirement was removed in Struts 2 allowing you to use a POJO (plain old Java object) - including the action class itself, if you wish - as the form bean. Using Struts 2 Annotations: Struts 2 supports annotation based configuration and we can use it to create action classes.
To use struts 2 annotations, we need to add struts2-convention-plugin library in the classpath and in killarney10mile.com struts2 filter configuration provide the java package that contains action classes.
In Struts 2 Action, Action class is a POJO (Plain Old Java Object) class. POJO class contain setters and getters methods and constructors. The Action class contain some setters, getters, execute() method. The action class contains business logic, retrieve resource bundle, hold the data, validation, and select the view result page that should send back to the user.
It’s the heart of the Struts 2, so you have to understand the basic concept of actions. Jan 03, · java-struts: How to select multiple values from a select list in struts2? Answers. In order to select multiple values from select list in struts2 set the attribute multiple="true".
Let´s see the code: 2, 4) in action class. As in this value at second and fourth position will be pre selected.Download