Learn from the Jakartaee API framework: important features and design principles
Learn from the Jakartaee API framework: important features and design principles
introduction:
Jakartaee (formerly known as Java Enterprise Edition) is a powerful enterprise -level application development platform that provides a comprehensive set of APIs and specifications for the construction of scalable, reliable and secure corporate applications.This article will explore the important features of the Jakartaee API framework and its design principles, and provide Java code examples to the required parts.
1. Important features:
1. Layout architecture: Jakartaee framework adopts a layered architecture design, providing a series of APIs and specifications, including web, enterprises, persistence and other layers.The advantage of this layered architecture is to improve the maintenance and scalability of the code, and enable developers to focus on the specific business logic of the application.
2. Container management: Jakartaee applications are managed by the container when runtime.The container provides a series of services, including request processing, transaction management, resource allocation, etc.Developers can use relevant annotations or configuration files to define how the container manages application components.
3. Component reuse: Jakartaee framework provides a set of standardized components, such as Servlet, EJB, JPA, etc. Developers can build applications through combinations.The collaboration between components follows the standardized design model, making it easier to integrate between different components.
4. Security: Jakartaee provides a series of security features, such as certification, authorization, encryption, etc. to protect the sensitive data and resources of enterprise applications.Developers can use Jakartaee's security API to achieve authentication and access control, and ensure the confidentiality and integrity of the data.
2. Design principles:
1. Loose coupling: Jakartaee framework encourages developers to adopt the design principles of loose coupling to define the relationship between the components of the application by using the interface and abstract class.This design principle makes the replacement and reuse between different components easier.
2. Insertability: Jakartaee framework supports insertable ways to expand and customize the function of the application.Developers can add new functions or modify existing functions by achieving corresponding interfaces or extended components.
3. Easy test: Jakartaee framework provides a series of tools and technologies to simplify application testing.Developers can use the unit test framework to test independent components, or they can also use the integrated test framework to test the function and performance of the entire application.
Example code:
1. Servlet example:
@WebServlet("/hello")
public class HelloServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.getWriter().print("Hello, JakartaEE!");
}
}
2. EJB example:
@Stateless
public class CalculatorBean implements Calculator {
public int add(int a, int b) {
return a + b;
}
}
in conclusion:
As an enterprise -level application development platform, Jakartaee provides rich API and specifications to build high -efficiency, secure and reliable corporate applications.By understanding the important characteristics and design principles of Jakartaee, and using the corresponding example code as a reference, developers can better use the framework to build an excellent corporate application.
