Explore Wildfly in the Java class library: the technical principles of the framework of the Server
Wildfly is an open source Java application server that is one of the leading server frameworks for development and deployment of Java applications.As the successor of the Jboss Application Server, Willdfly provides a comprehensive Java Ee (Enterprise Edition) function, including JMS (Java Message Service), JPA (Java Persistence API), etc.
Wildfly's technical principles involve the following aspects:
1. architecture: Wildfly uses a modular architecture to divide the function into multiple modules, and each module can be loaded and uninstalled independently.This modular design makes Wildfly has the advantages of lightweight and height customization.
2. Servlet container: Wildfly has a built -in Servlet container for handling web requests and responses.It implements the Java Servlet specification that can handle the life cycle, request distribution, session management, etc. of the web application.
The following is an example code that shows how to create a simple server in Wildfly:
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class HelloWorldServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
resp.getWriter().println("Hello, World!");
}
}
3. Enterprise Java Beans (EJB) container: Wildfly also integrates EJB containers to support distributed transactions, asynchronous message processing, etc.EJB is a server -side component model for developing enterprise applications, which provides support for transaction management and container management.
Below is an EJB sample code using Wildfly:
import javax.ejb.Stateless;
@Stateless
public class ExampleEJB {
public String sayHello() {
return "Hello, World!";
}
}
4. Database access: Wildfly provides JPA as persistent technology, enabling developers to use objects to access the database.JPA defines a set of APIs to map Java objects to the relationship database table, realizing the duration and query of data.
The following is a simple example of using JPA code:
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
public class Person {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String name;
// omit the getter and setter method
}
To sum up, Wildfly is a powerful and highly customized Java application server framework.Its technical principles include modular architecture, Servlet container, EJB container and JPA data duration.By mastering these principles, developers can better use Wildfly for development and deployment of Java applications.
