sumservlet.java

J2ME MIDP_Example_Applications

// Copyright 2002 Nokia Corporation.
//
// THIS SOURCE CODE IS PROVIDED 'AS IS', WITH NO WARRANTIES WHATSOEVER,
// EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS
// FOR ANY PARTICULAR PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE
// OR TRADE PRACTICE, RELATING TO THE SOURCE CODE OR ANY WARRANTY OTHERWISE
// ARISING OUT OF ANY PROPOSAL, SPECIFICATION, OR SAMPLE AND WITH NO
// OBLIGATION OF NOKIA TO PROVIDE THE LICENSEE WITH ANY MAINTENANCE OR
// SUPPORT. FURTHERMORE, NOKIA MAKES NO WARRANTY THAT EXERCISE OF THE
// RIGHTS GRANTED HEREUNDER DOES NOT INFRINGE OR MAY NOT CAUSE INFRINGEMENT
// OF ANY PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OWNED OR CONTROLLED
// BY THIRD PARTIES
//
// Furthermore, information provided in this source code is preliminary,
// and may be changed substantially prior to final release. Nokia Corporation
// retains the right to make changes to this source code at
// any time, without notice. This source code is provided for informational
// purposes only.
//
// Nokia and Nokia Connecting People are registered trademarks of Nokia
// Corporation.
// Java and all Java-based marks are trademarks or registered trademarks of
// Sun Microsystems, Inc.
// Other product and company names mentioned herein may be trademarks or
// trade names of their respective owners.
//
// A non-exclusive, non-transferable, worldwide, limited license is hereby
// granted to the Licensee to download, print, reproduce and modify the
// source code. The licensee has the right to market, sell, distribute and
// make available the source code in original or modified form only when
// incorporated into the programs developed by the Licensee. No other
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// intellectual property rights is granted herein.


package example.sum;

import java.util.Enumeration;

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


public class SumServlet
    extends HttpServlet
{
    public void init(ServletConfig config) throws ServletException
    {
        super.init(config);
    }


    public void doPost(HttpServletRequest  request,
                       HttpServletResponse response)
        throws IOException, ServletException
    {
        try
        {
            // First handle session
            HttpSession session = request.getSession(false);
            if (session == null)  // first connection?
            {
                session = request.getSession(true);   // create
                String requestUrl = request.getRequestURL().toString();
                String rewrittenUrl = response.encodeURL(requestUrl);
                response.setHeader("X-RewrittenURL", rewrittenUrl);
            }

            // read request
            InputStream in = request.getInputStream();
            int requestLength = request.getContentLength();
            if (requestLength == -1)
            {
                throw new IOException("Need to know request length");
            }
            StringBuffer buf = new StringBuffer(requestLength);
            for (int i = 0; i < requestLength; ++i)
            {
                int ch = in.read();
                if (ch == -1)
                {
                    break;
                }
                buf.append((char)ch);
            }
            in.close();
            String requestStr = buf.toString();

            // process request, producing response
            String responseStr;
            int totalSoFar = 0;
            Integer savedTotal = (Integer)(session.getAttribute("total"));
            if (savedTotal != null)
            {
                totalSoFar = savedTotal.intValue();
            }
            try
            {
                int newValue = Integer.parseInt(requestStr);
                totalSoFar += newValue;
                responseStr = Integer.toString(totalSoFar);
            }
            catch (NumberFormatException e)
            {
                responseStr = "Error";
            }
            session.setAttribute("total", new Integer(totalSoFar));

            // write response
            response.setContentType("text/plain");
            PrintWriter out = response.getWriter();
            out.write(responseStr);
            out.close();
        }
        catch (IOException e)
        {
            e.printStackTrace();
            throw e;
        }
        catch (Exception e)
        {
            e.printStackTrace();
            throw new ServletException(e.getMessage());
        }
    }


    public String getServletInfo()
    {
        return "Sum Servlet.";
    }
}