What is action servlet in struts?


What is action servlet in struts?

The controller servlet uses a struts-config. xml file to map incoming requests to Struts Action objects, and instantiate any ActionForm objects associated with the action to temporarily store form data. The Action object processes requests using its execute method, while making use of any data stored in the form bean.

What is the role of action class in struts?

Action Class in Struts framework defines the business logic. An action class handles the client request and prepares the response. It also decides where the response should be forwarded. Basically an action class receives data from the presentation layer and forwards the data to the corresponding business layer.

How does Struts framework work?

Struts is an open source framework that extends the Java Servlet API and employs a Model, View, Controller (MVC) architecture. It enables you to create maintainable, extensible, and flexible web applications based on standard technologies, such as JSP pages, JavaBeans, resource bundles, and XML.

Which initialize parameter is used to specify struts configuration?

Starting with Struts 1.1, you can specify a comma-separated list of configuration files for this paramter. Specify additional application modules by using the value config/ and the prefix of the module. In this example, the init-param name would be config/module1 , and the value might be WEB-INF/struts-sub1-config.

Is servlet a framework?

In contrast, Struts and the Spring MVC Framework are action-oriented frameworks that provide a thinner abstraction layer over the servlet API….At a glance.

Action-based frameworks: Apache Struts, Spring MVC
Web template systems: Apache Tiles, SiteMesh, Thymeleaf

How do you call struts action?

Struts 2 “action” tag is used to call action class directly from a JSP page. if the “executeResult” attribute is set to true, the content of the result page will be rendered directly in the current page.

Which is better spring or Struts?

Spring framework is more efficient than struts but sometimes spring framework provides complexity but in struts, everything is simple due to its easy and maintainable design. Spring framework has more functionality than struts. Spring MVC is mainly used because it is more secure and better performance.

Which of the following is correct about Struts 2 validation framework?

Rather the Struts 2 framework will return input as the result of calling the action. Hence, when validation fails and Struts 2 returns input, the Struts 2 framework will redisplay the index. jsp file. Since, we used Struts 2 form tags, Struts 2 will automatically add the error messages just above the form filed.

Which config files are used in struts?

Configuration Files

File Optional Purpose
struts.xml yes Main configuration, contains result/view types, action mappings, interceptors, and so forth \ yes Framework properties
struts-default.xml yes Default configuration provided by Struts
struts-default.vm yes Default macros referenced by

What does a servlet do in Apache Struts?

There will be one instance of this servlet class, which receives and processes all requests that change the state of a user’s interaction with the application. This component represents the “controller” component of an MVC architecture. The controller servlet will select and invoke an action class to perform the requested business logic.

How to select an action in Java struts?

Identify, from the incoming request URI, the substring that will be used to select an action procedure. Use this substring to map to the Java class name of the corresponding action class (an implementation of the Action interface).

How to inject objects in Struts 2 Action class?

That’s why Struts 2 API provides a bunch of interfaces that we can implement in action classes to inject these objects in Action classes. All of these interfaces end with “Aware” and defined in org.apache.struts2.interceptor package.

Which is the better class servletactioncontext or actioncontext?

The ServletActionContext class provides methods to get HttpServletRequest, HttpServletResponse, ServletContext and HttpSession objects. It is a convenient class and prefered than ActionContext class. The commonly used methods provided by ServletActionContext class are as follows: