Using Jetty10 for Web server processing in Java API development

Jetty is an open source Java web server and servlet container that supports a variety of different protocols and is an advanced server processing product. Jetty is widely used in Java API development and can be used to build web applications, develop RESTful services, implement WebSocket services, etc. In this article, we will introduce how to use Jetty10 for web server processing in Java API development.

1. Installing Jetty10

First of all, you need to install Jetty10 before using it. The official website download address is: https://www.eclipse.org/jetty/download.php. After the download is complete, enter the directory where Jetty is located, open a terminal and enter the following command:

java -jar start.jar --list-config

A start.ini file will be generated after running.

2. Configuring Jetty10

Next, you need to configure Jetty10. We can use Maven to manage our projects and dependent libraries. Add the following content to the pom.xml file:

<dependency>
    <groupId>org.eclipse.jetty</groupId>
    <artifactId>jetty-server</artifactId>
    <version>10.0.6</version>
</dependency>

<dependency>
    <groupId>org.eclipse.jetty</groupId>
    <artifactId>jetty-servlet</artifactId>
    <version>10.0.6</version>
</dependency>

Here the necessary Jetty libraries will be added and the version number will be set.

3. Create Server and Handler

In Jetty, we need to create a Server object and a Handler object. The Server object is responsible for accepting and processing requests and returning responses, while the Handler object is responsible for sending the request to the correct handler.

In another class, we can create the following code:

public class JettyServer {
    public static void main(String[] args) throws Exception {
        Server server = new Server(8080);

        ServletHandler handler = new ServletHandler();
        handler.addServletWithMapping(MyServlet.class, "/hello/*");
        server.setHandler(handler);

        server.start();
        server.join();
    }
}

Here we create a JettyServer class and set its port to 8080. Then, we create a ServletHandler object and map the MyServlet class to the /hello path. Finally, we set the Handler object as the handler of the Server object and start the server.

4. Create Servlet

In Jetty, Servlet is a common way to handle HTTP requests. Servlets can be created by inheriting the javax.servlet.http.HttpServlet class, for example:

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 MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().print("Hello, Jetty!");
        resp.getWriter().close();
    }
}

Here we define a MyServlet class and override the doGet() method to handle HTTP GET requests. When the request reaches the /hello path, it will return the string "Hello, Jetty!"

5. Running Jetty10

Everything is ready, we can now start Jetty10 and test our server. Run the following command in the terminal:

java -jar start.jar

Then visit http://localhost:8080/hello in the browser, you should see the output "Hello, Jetty !" page.

6. Conclusion

Overall, Jetty is a very powerful web server processing product for Java API development. It can be managed using Maven and is easy to configure and use. In this article, we have learned how to use Jetty10 for Web server processing, including steps such as installing Jetty10, configuring Jetty10, and creating Server and Handler objects. If you are doing Java API development, Jetty10 may become a very useful tool.

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