Jetty Embedded Hello World Application

We used to deploy our application in server. In some cases, we need to deploy server in our application. In this post, I am going to explain you, how to deploy Jetty in your application.

I am going to use following Maven dependency.

<dependency>
  <groupId>org.eclipse.jetty</groupId>
  <artifactId>jetty-server</artifactId>
  <version>9.3.4.RC1</version>
</dependency>

HelloWorld.java

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.AbstractHandler;

public class HelloWorld extends AbstractHandler {

  @Override
  public void handle(String target, Request baseRequest,
      HttpServletRequest request, HttpServletResponse response)
      throws IOException, ServletException {
    response.setContentType("text/html; charset=utf-8");
    response.setStatus(HttpServletResponse.SC_OK);
    response.getWriter().println("<h1>Welcome to Jetty Application</h1>");
    baseRequest.setHandled(true);
  }

  public static void main(String[] args) throws Exception {
    Server server = new Server(8080);
    server.setHandler(new HelloWorld());
    server.start();
    server.join();
  }
}

Run above application and hit the url ‘http://localhost:8080/’ in browser. You will get following output.

Server server = new Server(8080);

server.start();

server.join();   

Above statements create and run an HTTP server on port 8080. If you don’t set any handlers to this server, then it returns 404-error message for every request.

public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response)

target: Represents the target of the request, usually it is an URI.

baseRequest: Jetty mutable request object

request: Immutable request object, can be wrapped by a filter or servlet.

response: response send to user, can be wrapped by a servlet/filter.

server.setHandler(new HelloWorld());

Once we add the handler to server instance, it can able to handle HTTP requests.

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