Creating Logout button and invalidating session

Hello All:
I'm new to java and I'm trying to figure out how to log a user out of a web servlet. Basically I just have a link that returns the user to the first servlet (my login servlet) called log out. I am wondering if when I click on that link (or do I need to make it a button) that I can tell the servlet to invalidate the session I have created, therefore allowing a new user to login from the login servlet.
I honestly have no idea how to go about this. The following is my code from another servlet in my group:
import java.io.*;
import java.net.*;
import javax.servlet.*;
import javax.servlet.http.*;
* @author Owner
* @version
public class Item1ServletHW2 extends HttpServlet {
/** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
HttpSession session = request.getSession(true);
String getuser = (String)session.getAttribute("getuser");
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet Item1ServletHW2</title>");
out.println("</head>");
out.println("<body>");
out.println("<form action=>");
out.println("<table border=1 align=center width=65%>");
out.println("<tr><td align=center bgcolor=blue colspan=3><font color=white size=3>Welcome to the Music CDs Page </font><font color=red size=3><b>"+getuser+"</b></font></td></tr>");
out.println("<tr><td width=60% bgcolor=green align=center><font size=2 color=white><b>Item</font></td>");
out.println("<td width=10% bgcolor=green align=center><font color=white size=2><b>Unit Price</b></font></td>");
out.println("<td width=40% bgcolor=green align=center></td></tr>");
out.println("<td bgcolor=green align=left><img src=coldplay.jpg><font color=white size=2>ColdPlay X&Y</font></td>");
out.println("<td bgcolor=green align=center><font color=white size=2>$19.99</font></td>");
out.println("<td bgcolor=green align=center><input type=button name=addcart2 value=Add to Cart></td>");
out.println("</tr>");
out.println("<td bgcolor=green align=left><img src=oakenfold.jpg><font color=white size=2>Oakenfold - The Club</font></td>");
out.println("<td bgcolor=green align=center><font color=white size=2>$17.99</font></td>");
out.println("<td bgcolor=green align=center><input type=button name=addcart1 value=Add to Cart></td>");
out.println("</tr><tr><td colspan=3 align=center><font size=2 color=white><a href=CatServletHW2>Main Catalog</a> | <a href=ShopCartServletHW2>View Cart</a> | <a href=RegLoginServletHW2>Log Out</a></font></td></tr>");
out.println("</body>");
out.println("</html>");
out.close();
The Log Out link is the one I want to check when clicked, and if so, invalidate my session before the user is redirected to the RegLogin Servlet. Any help would be greatly appreciated. Thanks so much :).

I understand how to invalidate the session, but with this example:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class logout extends HttpServlet
          public void doGet(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException
               res.setContentType("text/html");
               PrintWriter pw = res.getWriter();
               HttpSession ses =req.getSession();
               ses.removeValue("desi");
               ses.removeValue("Login");
               ses.removeValue("password");
               res.sendRedirect("http://localhost:8080/examples/servlets/login.html");
How can I get this to process when clicking a link called "Log Out", or is there a way to create an onClick button that invalidates the session when clicked. Maybe something like this:
onClick="session.invalidate();response.sendRedirect("somewhere");>
Thanks for the helps, but I'm still a bit confused :).

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