Developers, Developers, Developers! Maksim Sorokin IT Blog

Servlet 3.0 Without Configuration Hell

Servlets 3.0 become easier.

Lets try simple InfoServlet example.

Our web.xml will look like:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name>info</display-name>
</web-app>

And our InfoServlet.java would look like:

package example; 

import java.io.IOException;
import java.io.PrintWriter; 

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; 

@WebServlet(urlPatterns = { "/info" })
public class InfoServlet extends HttpServlet { 

  private static final long serialVersionUID = 5585664118773284494L; 

  @Override
  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException,
      IOException {
    doPost(request, response);
  } 

  @Override
  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException,
      IOException {
    PrintWriter out = response.getWriter();
    out.println("Info Servlet!");
    out.close();
  }
}

And that is it.

Why "InfoServlet"? Because it can be easily combined with earlier post about Maven versioning. In InfoServlet you can read a file with a version and show on a web page.