tagged: j2ee

Maven p20: Java servlets

To actually use Servlets in your webapp, we need a depedency which gives us all the J2EE goodness, the OSS Apache Geronimo project. The mvn depedency can be found here: http://mvnrepository.com/artifact/org.apache.geronimo.specs/geronimo-servlet_2.5_spec/1.2 Let's put that in the dependencies section of your pom.xml:

Now we need to tell web.xml that we're going to create a servlet, and give it a mapping also:
  <display-name>Archetype Created Web Application</display-name>

We're saying they'll be a servlet, called simple, and we give its to-be-created class. Then we map its name to a url pattern. Let's now create that class in src/main/java/your.pky.simpleservlet
package your.pkg.simpleservlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class SimpleServlet extends HttpServlet {
	public void doGet(HttpServletRequest request, 
			HttpServletResponse response)
		throws ServletException, IOException {

		PrintWriter out = response.getWriter();

		HttpSession lSess = request.getSession(true);
		int lInactive = lSess.getMaxInactiveInterval();
		long lTime = lSess.getLastAccessedTime();
		lSess.setAttribute("bar", "Hello, session attribute!");
		String att = (String) lSess.getAttribute("bar");


	public void init() throws ServletException {

	public void destroy() {

Notice we're importing lots of servlet classes. These are given to use by the Geronimo project. The class extends a HttpServlet. init() and destory() are called at moments that you can imagine well enough yourself. The doGet() is called during a GET request. Whatever's written to the HttpServletResponse is outputted. And we can get session information, even getting session variables.

maven java j2ee

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