post method does not support this url

post method does not support this url

This is Get product servlet class of Shoping site example of Http Session. I want to add selected product in the cart thorough this class i want to delegate control to add product servlet. but I am receiving one error that is post method does not supported by this url.

package com.prakhar.servlet;

import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.util.*;

public class GetProductsServlet extends HttpServlet { public void init()throws ServletException { productsdao=new ProductsDAO(); }

public void doGet(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException
{
    HttpSession hs=req.getSession(false);
    if(hs==null)
    {
        RequestDispatcher rd=req.getRequestDispatcher("Login.html");
        rd.forward(req, res);
        return;
    }
    String uname=(String)hs.getAttribute("UserName");
    res.setContentType("text/html");
    PrintWriter out=res.getWriter();

    out.println("<html><head>");
    out.println("<title>Shoping Cart Example</title>");
    out.println("</head><body>");
    out.println("<table width='100%' height='90%' border='1'>");
    out.println("<tr align='center'>");
    out.println("<td height='39' colspan='2'><strong><font size='5'>MyShoppingSite</font></strong></td>");
    out.println("</tr>");
    out.println("<tr>");
    out.println("<td width='18%' height='500' valign='top'><p>&nbsp;</p>");
    out.println("<blockquote><p>");
    out.println("<a href='"+res.encodeURL("getProducts")+"'>");
    out.println("View Products</a></p><p>");
    out.println("<a href='"+res.encodeURL("getCart")+"'>");
    out.println("View Cart Detail</a></p><p>");
    out.println("<a href='"+res.encodeURL("logout")+"'>");
    out.println("Logout</a></p>");
    out.println("</blockquote></td>");
    out.println("<td width='82%' align='left' valign='top'><p>");
    out.println("<font size='6'>Welcome , "+uname+"</font></p>");
    out.println("<form method="post" action='"+res.encodeURL("addProducts")+"'>");
    System.out.println(res.encodeURL("GetProductsServlet"));
    out.println("<table width='100%' border='1'>");
    out.println("<tr>");
    out.println("<th width='8%'>Check</th>");
    out.println("<th width='24%'>Product Code</th>");
    out.println("<th width='28%'>Product Name</th>");
    out.println("<th width='20%'>Available Quantity</th>");
    out.println("<th width='20%'>Required Quantity</th>");
    out.println("</tr>");

    Collection products=productsdao.getProducts();

    System.out.println("GetProductsServlet"+products);

    if(products==null)
    {
        out.println("<tr><td colspan=5 align=center>");
        out.println("No Products Available");
        out.println("</td></tr>");
    }
    else
    {
        Iterator i=products.iterator();

        System.out.println("Iterator"+i);

        while(i.hasNext())
        {
            Product p=(Product)i.next();
            out.println("<tr>");
            out.println("<td align='center'>");
            out.println("<input type='checkbox' name='products' value='"+p.getCode()+"'/>");
            System.out.println("GetProductServlet p.getCode()"+p.getCode());
            out.println("<input type='hidden' name='"+p.getCode()+"Name' value='"+p.getName()+"'/></td>");
            out.println("<td>"+p.getCode()+"</td>");
            out.println("<td>"+p.getName()+"</td>");
            out.println("<td>"+p.getQty()+"</td>");
            out.println("<td>");
            out.println("<input type='text' name='"+p.getCode()+"'/>");
            out.println("</td></tr>");
        }
    }   
        out.println("</table>");
        out.println("<br/><center>");
        out.println("<input type=submit value='Add Product to Cart'/>");
        out.println("</center>");
        out.println("</form>");
        out.println("</td></tr>");
        out.println("<tr align='center'>");
        out.println("<td colspan='2'>");
        out.println("<em>&copy;Copyrights 2005-09</em></td");
        out.println("</tr>");
        out.println("</table>");
        out.println("</body></html>");
        out.flush();
        out.close();

}

ProductsDAO productsdao=new ProductsDAO();

}

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