feedback.java

wap push功能程序 WAP开发网 : http://www.wapkf.com

package feedback;

import push.Winner;
import push.PushInitiator;
import members.Members;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

/**
 * Feedback class handles the feedback section of your WML home pages.
 *
 * Initialization parameters:
 *   "questionsfile" determines the name of the file containing your questions 
 *   "feedbackfile" determines the name of the file where the feedback is saved
 *
 *    The first line in your questionsfile contains the different choises the user can choose from
 *    if the line starts with a "!" the answer will be a String
 *
 * @version 1.0
 * @since 1.0
 * @see HttpServlet
 */
public final class Feedback extends HttpServlet {

    private static final String XML_VERSION = "<?xml version=\"1.0\"?>";
    private static final String CONTENT_TYPE = "text/vnd.wap.wml";
    private static final String DOC_TYPE = "<!DOCTYPE wml PUBLIC \"-//WAPFORUM//DTD WML 1.1//EN\"\n" +
	"  \"http://www.wapforum.org/DTD/wml_1.1.xml\">";

    private static int numberOfQuestions=0;
    private static String grades;
    private static final Vector questions = new Vector();
    private static final String HOME_PAGE = "/index.jsp";
    private static String feedbackFile = null;

    private static Winner winner = null;

    /**
     * This is the initialization code that runs only once. (when you start the servlet)
     * The servlet is being placed into service.
     */
    public void init() throws ServletException {
	String questionsFile = getInitParameter ("questionsfile");
	questionsFile = getServletContext().getRealPath(questionsFile);
	feedbackFile = getInitParameter ("feedbackfile");
	feedbackFile = getServletContext().getRealPath(feedbackFile);

	try {
	    BufferedReader reader = new BufferedReader(new FileReader(questionsFile));
	    grades = reader.readLine();
	    String line;
	    while((line = reader.readLine()) != null) {
		if(line.trim().equals(""))  break;
		questions.add(line);
	    }
	}
	catch (java.io.IOException e) {
	    System.err.println(e);
	}
	numberOfQuestions = questions.size();
    }

    /**
     * Called by the server to allow a servlet to handle a GET request. 
     *
     * @param request a <code>HttpServletRequest</code> value
     * @param response a <code>HttpServletResponse</code> value
     * @exception ServletException if an error occurs
     * @exception IOException if an error occurs
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response) 
	throws ServletException, IOException {
	doPost(request, response);
    }

    /**
     * Called by the server to allow a servlet to handle a POST request.
     *
     * @param request a <code>HttpServletRequest</code> value
     * @param response a <code>HttpServletResponse</code> value
     * @exception ServletException if an error occurs
     * @exception IOException if an error occurs
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response) 
	throws ServletException, IOException {

	/* Session tracking. See the description in index.jsp */
	HttpSession session = request.getSession();
	boolean cookiesCheck = request.getHeader("cookie") != null && request.isRequestedSessionIdValid();
	final String jsessionID = cookiesCheck ? "" : ";jsessionid=" + session.getId();

	/* Initialize a winner selecting thread that selects a winner from the set of users who has given feedback.
           It will send a push message to the winner */
	if(winner == null) {
	    PushInitiator pusher = Members.getInitiator();
	    if(pusher != null) {
		winner = new Winner(pusher, "http://" + request.getServerName() + ":" + 
				    request.getServerPort() + request.getContextPath() + 
				    "/services/winner.jsp", Members.getPushAddressType());
		new Thread(winner).start();
	    }
	}

	/* start generating the response ... */
	response.setContentType(CONTENT_TYPE);
	PrintWriter out = response.getWriter();
      
	out.println(XML_VERSION);
	out.println(DOC_TYPE);
	out.println("<wml>");

	out.println("<!-- provides a way back using the prev element -->\n" +
		    "<template>" +
		    " <do type=\"prev\">" + 
		    "  <prev/>" +
		    " </do>" +
		    "</template>");

	if(request.getParameter("action") == null) {
	    out.println("<!-- questions card -->\n" +
			"<card title=\"Feedback\" id=\"questionsCard\">" +
			"<do type=\"accept\" label=\"Send form\">" +
			"<go method=\"post\" href=\"" + request.getRequestURI() + jsessionID + "\">");
	    for (int i = 0; i < numberOfQuestions; ++i)
		out.println("<postfield name=\"answer" + i + "\" value=\"$(choise" + i + ")\"/>");
	    out.println("<postfield name=\"action\" value=\"write\"/>");
	    out.println("<postfield name=\"sendname\" value=\"$(sendname)\"/>");
	    out.println("</go></do>" +
			"<p>Please grade our mobile service:<br/>");
	    String gradesOut = "";
	    StringTokenizer st = new StringTokenizer(grades);
	    for(int j=1; st.hasMoreTokens(); ++j)
		gradesOut = gradesOut + "<option value=\"" + j + "\">" + st.nextToken() + "</option>\n";

	    for (int i=0; i < numberOfQuestions; ++i) {
		String question = (String)questions.get(i);
		if (question.startsWith("!")){
		    out.println(question.substring(1) + "&#160;");
		    out.println("<input name=\"choise" + i + "\"/>");
		}
		else{
		    out.println(question + "&#160;");
		    out.println("<select value=\"Empty\" title=\"" + question + "\" name=\"choise" + i + "\">");
		    out.println("<option value=\"Empty\">Select</option>");
		    out.println(gradesOut);
		    out.println("</select>");
		}
	    }

	    if (session.getAttribute("name") != null){ 
		out.println("<select name=\"sendname\" value=\"yes\">" + 
			    "<option value=\"yes\">Include name</option>" +
			    "<option value=\"no\">Do not include name</option>" +
			    "</select>");
	    } 
	    out.println("<anchor title=\"Send form\">Send form" +
			"<go method=\"post\" href=\"" + request.getRequestURI() + jsessionID + "\">");
	    for (int i = 0; i < numberOfQuestions; ++i)
		out.println("<postfield name=\"answer" + i + "\" value=\"$(choise" + i + ")\"/>");
	    out.println("<postfield name=\"action\" value=\"write\"/>");
	    out.println("<postfield name=\"sendname\" value=\"$(sendname)\"/>");
	    out.println("</go></anchor></p>" +
			"</card>");
	}
	else {
	    out.println("<!-- Thanks about the feedback -->\n" +
			"<card title=\"Thank you\" id=\"thanks\">" +
			" <do type=\"accept\" label=\"Ok\">" +
			"  <go href=\"" + request.getContextPath() + HOME_PAGE + jsessionID + "\"/>" +
			" </do>" +
			" <p>Your message has been delivered.<br/>Thank you for your feedback!<br/>" +
			((session.getAttribute("name") != null) ?  
			 "Note! Each member feedback (if name included) enters a draw for wonderful prizes.<br/>" : "") +
			" <anchor title=\"Info pages\">Info pages" +
			"  <go href=\"" + request.getContextPath() + HOME_PAGE + jsessionID + "\"/>" +
			" </anchor>" +
			" </p>" +
			"</card>");


	    /* finally, update the feedback file. */
	    synchronized (feedbackFile) {
		PrintWriter writer = new PrintWriter(new FileOutputStream(feedbackFile, true), true);
		for (int i = 0; i < numberOfQuestions; ++i){
		    String answer = request.getParameter("answer" + i);
		    writer.print(answer + ";");
		}
		if (request.getParameter("sendname") != null && request.getParameter("sendname").equals("yes")) 
		    writer.println((String)session.getAttribute("name"));
		else 
		    writer.println();
		writer.flush();
	    }
	}
	out.println("</wml>");

    }

    /**
     * <code>viewVotes</code> views the information related to received feedbacks, i.e., 
     * average grades for each question.
     *
     * @return a <code>String</code> value
     */
    public static String viewVotes() {
	String returnStr = "";
	try {
	    int numberOfLines = 0;
	    double[] stats = new double[numberOfQuestions];
	    int[] empty = new int[numberOfQuestions];
	    synchronized(feedbackFile) {
		BufferedReader reader = new BufferedReader(new FileReader(feedbackFile));
		StringTokenizer st = null;
		String line;
		while ((line = reader.readLine()) != null){
		    st = new StringTokenizer(line, ";");
		    for (int i = 0; i < numberOfQuestions; ++i){
			String token = st.nextToken();
			if (!(token.equals("Empty"))) stats[i] = stats[i] + Integer.parseInt(token);
			else ++empty[i];
		    }
		    ++numberOfLines;
		}
	    }
	    for (int j = 0; j < numberOfQuestions; ++j)
		returnStr = returnStr + questions.get(j) + ": " + 
		    Math.rint(100.0*stats[j] / (numberOfLines - empty[j]))/100.0 + "<br/>";
	    returnStr = returnStr + "Votes: " + numberOfLines;
	}
	catch(Exception e){ System.err.println(e); }
	return returnStr;
    }

   /**
     * Selects winner from a set of users who have returned feedback
     *
     * @param feedbackFile a <code>String</code> value
     * @return a <code>String</code> value
     */
    public static String winner() {
	try{
	    synchronized(feedbackFile) {
		BufferedReader reader = new BufferedReader(new FileReader(feedbackFile));
		int numberOfPossibilities = 0;
		while (reader.readLine() != null) ++numberOfPossibilities;
		int winner = 1 + (int)(Math.random() * numberOfPossibilities);
		String winnerStr ="";
		reader = new BufferedReader(new FileReader(feedbackFile));
		for (int i = 0; i < winner; ++i) winnerStr = reader.readLine();
		StringTokenizer st = new StringTokenizer(winnerStr, ";");
		while (st.hasMoreTokens()) winnerStr = st.nextToken();
		return winnerStr;
	    }
	}
	catch(FileNotFoundException e){}
	catch(IOException e){}
	return "";
    }

}