Jetty: Embedding Servlet contexts

By using ServletContextHandler, we can map urls to servlets. For example, following application map ‘loclahost:8080’ to WelcomeServlet, and ‘localhost:8080/hello’ to HelloServlet.

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 HelloServlet extends HttpServlet {
  private static final long serialVersionUID = 1L;

  public HelloServlet() {
    super();
  }

  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    response.setContentType("text/html");
    response.setStatus(HttpServletResponse.SC_OK);
    response.getWriter().println("<h1>Hello from HelloServlet</h1>");
  }

}

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 WelcomeServlet extends HttpServlet {
  private static final long serialVersionUID = 1L;

  public WelcomeServlet() {
    super();
  }

  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    response.setContentType("text/html");
    response.setStatus(HttpServletResponse.SC_OK);
    response.getWriter().println("<h1>Welcome Jetty programming</h1>");
  }

}

import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.servlet.ServletContextHandler;

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

    ServletContextHandler context = new ServletContextHandler(
        ServletContextHandler.SESSIONS);

    context.setContextPath("/");
    context.addServlet(HelloServlet.class, "/hello");
    context.addServlet(WelcomeServlet.class, "/");

    server.setHandler(context);

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

Run TestServlet, and hit the urls ‘http://localhost:8080’, ‘http://localhost:8080/hello’ you will get following output.

Output for ‘http://localhost:8080’

Output for ‘http://localhost:8080/hello’

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