Edit D:\app\Administrator\product\11.2.0\dbhome_1\owb\jrt\default-web-app\WEB-INF\classes\SurveyServlet.java

/*
* @(#)SurveyServlet.java
*
* Copyright (c) 1995, 2004, Oracle. All rights reserved.  
*
* This software is the confidential and proprietary information of Sun
* Microsystems, Inc. ("Confidential Information").  You shall not
* disclose such Confidential Information and shall use it only in
* accordance with the terms of the license agreement you entered into
* with Sun.
* 
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
* SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
* SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
* THIS SOFTWARE OR ITS DERIVATIVES.
*/

import java.io.*;
import java.util.*;

import javax.servlet.*;
import javax.servlet.http.*;

/**
 * A sample single-threaded servlet that takes input from a form
 * and writes it out to a file. It is single threaded to serialize
 * access to the file. After the results are written to the file,
 * the servlet returns a "thank you" to the user.
 * 
 * You can run the servlet as provided, and only one thread will run
 * a service method at a time. There are no thread synchronization
 * issues with this type of servlet, even though the service method
 * writes to a file. (Writing to a file within a service method
 * requires synchronization in a typical servlet.)
 * 
 * You can also run the servlet without using the single thread
 * model by removing the <tt>implements</tt> statement. Because the
 * service method does not synchronize access to the file, multiple
 * threads can write to it at the same time. When multiple threads try
 * to write to the file concurrently, the data from one survey does not
 * follow the data from another survey in an orderly fashion.
 * 
 * To see interaction (or lack of interaction) between threads, use
 * at least two browser windows and have them access the servlet as
 * close to simultaneously as possible. Expect correct results (that
 * is, expect no interference between threads) only when the servlet
 * implements the <code>SingleThreadedModel</code> interface.
 */

public class SurveyServlet extends HttpServlet
        implements SingleThreadModel {
    String resultsDir;

public void init(ServletConfig config)
            throws ServletException {
        super.init(config);
        resultsDir = getInitParameter("resultsDir");
        if (resultsDir == null) {
            Enumeration initParams = getInitParameterNames();
            System.err.println("The init parameters were: ");
            while (initParams.hasMoreElements()) {
                System.err.println(initParams.nextElement());
            }
            System.err.println("Should have seen one parameter name");
            throw new UnavailableException(this,
                                           "Not given a directory to write survey results!");
        }
    }

/**
     * Write survey results to output file in response to the POSTed
     * form.  Write a "thank you" to the client.
     */
    public void doPost(HttpServletRequest req, HttpServletResponse res)
            throws ServletException, IOException {
        // first, set the "content type" header of the response
        res.setContentType("text/html");

//Get the response's PrintWriter to return text to the client.
        PrintWriter toClient = res.getWriter();

try {
            //Open the file for writing the survey results.
            String surveyName = req.getParameterValues("survey")[0];
            FileWriter resultsFile = new FileWriter(resultsDir
                                                    + System.getProperty("file.separator")
                                                    + surveyName + ".txt", true);
            PrintWriter toFile = new PrintWriter(resultsFile);

// Get client's form data & store it in the file
 toFile.println("<BEGIN>");
 Enumeration values = req.getParameterNames();
 while (values.hasMoreElements()) {
 String name = (String) values.nextElement();
 String value = req.getParameterValues(name)[0];
 if (name.compareTo("submit") != 0) {
 toFile.println(name + ": " + value);
 }
 }
 toFile.println("<END>");

//Close the file.
            resultsFile.close();

// Respond to client with a thank you
 toClient.println("<html>");
 toClient.println("<title>Thank you!</title>");
 toClient.println("Thank you for participating");
 toClient.println("</html>");

} catch (IOException e) {
            e.printStackTrace();
            toClient.println("A problem occured while recording your answers.  "
                             + "Please try again.");
        }

// Close the writer; the response is done.
        toClient.close();
    }
}

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