How Do I Use Jetty Web Server?

Jetty is a popular web server that is known for its lightweight and high-performance capabilities. It is widely used in Java-based applications to handle HTTP requests and serve web content. In this tutorial, we will explore how to use Jetty web server effectively.

Step 1: Downloading and Setting Up Jetty

To start using Jetty, you first need to download it from the official website. Once downloaded, extract the files to a directory of your choice.

Step 2: Creating a Basic Servlet

Jetty works with servlets, which are Java classes that handle HTTP requests and generate responses. Let’s create a basic servlet:

package com.example;
import javax.servlet.http.HttpServlet;
import javax.HttpServletRequest;
import javax.HttpServletResponse;

public class MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) {
        // Servlet logic goes here..
    }
}

Note:

• @Override: This annotation indicates that we are overriding a method from the parent class.
• @Override doGet(): This method is called when an HTTP GET request is received by the servlet.
• You can customize the logic inside the doGet() method to handle different types of requests.

Step 3: Configuring Jetty Server

In order to use Jetty, we need to configure it properly. Create a new Java class with the following code:

package com.example;
import org.eclipse.jetty.server.Server;
import org.ServletHandler;

public class JettyServer {
    @SuppressWarnings("deprecation")
    public static void main(String[] args) {
        Server server = new Server(8080);
        ServletHandler handler = new ServletHandler();
        handler.addServletWithMapping(MyServlet.class.getName(), "/");
        server.setHandler(handler);

        // Add more servlets or handlers as needed.

        @SuppressWarnings("deprecation")
        try {
            server.start();
            server.join();
        } @catch(Exception e) {
            e.printStackTrace();
        }
    }
}

Note:

• @SuppressWarnings(“deprecation”): This annotation suppresses deprecation warnings for the start() and join() methods.
• The code sets up a Jetty server on port 8080 and maps our MyServlet class to the root URL (“/”). You can add more servlets or handlers as needed.
• The server.start() method starts the Jetty server, while the server.join() method waits for the server to finish processing requests.
• If any exception occurs during server startup, it will be printed to the console.

Step 4: Running the Jetty Server

To run the Jetty server, compile and run the JettyServer class. You should see output indicating that the server has started successfully.

$ javac -cp jetty-all-version.jar:. com/example/JettyServer.java
$ java -cp jetty-all-version. com.example.JettyServer

Step 5: Accessing the Servlet

Open a web browser and navigate to http://localhost:8080/. You should see the response generated by your servlet.

Conclusion

Congratulations! You have successfully learned how to use Jetty web server to handle HTTP requests and serve web content. Jetty’s lightweight nature and high-performance capabilities make it an excellent choice for Java-based web applications.

Note: Remember to stop the server by pressing Ctrl+C in the terminal when you are done testing.

You can now explore more advanced features of Jetty, such as configuring SSL/TLS, handling sessions, and serving static files. Check out the official Jetty documentation for more information.