Unable to track session hits

Mansukhdeep Thind

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posted 11 years ago

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Hi

I was trying out an example for session tracking in servlets using HttpSession interface as follows:

package testing;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet implementation class SessionTrack
 */
@WebServlet("/SessionTrack")
public class SessionTrack extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public SessionTrack() {
        super();
        // TODO Auto-generated constructor stub
    }

/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		 {
		      // Create a session object if it is already not  created.
		      HttpSession session = request.getSession(true);
		      // Get session creation time.
		      Date createTime = new Date(session.getCreationTime());
		      // Get last access time of this web page.
		      Date lastAccessTime = 
		                        new Date(session.getLastAccessedTime());

String title = "Welcome Back to my website";
		      Integer visitCount = new Integer(0);
		      String visitCountKey = new String("visitCount");
		      String userIDKey = new String("userID");
		      String userID = new String("ABCD");

// Check if this is new comer on your web page.
		      if (session.isNew()){
		         title = "Welcome to my website";
		         session.setAttribute(userIDKey, userID);
		         
		      } else {
		         visitCount = (Integer)session.getAttribute(visitCountKey);
		         visitCount = visitCount + 1;
		         userID = (String)session.getAttribute(userIDKey);
		      }
		      
		      session.setAttribute(visitCountKey,  visitCount);
		      
		      // Set response content type
		      response.setContentType("text/html");
		      PrintWriter out = response.getWriter();

String docType =
		      "<!doctype html public \"-//w3c//dtd html 4.0 " +
		      "transitional//en\">\n";
		      out.println(docType +
		                "<html>\n" +
		                "<head><title>" + title + "</title></head>\n" +
		                "<body bgcolor=\"#f0f0f0\">\n" +
		                "<h1 align=\"center\">" + title + "</h1>\n" +
		                 "<h2 align=\"center\">Session Infomation</h2>\n" +
		                "<table border=\"1\" align=\"center\">\n" +
		                "<tr bgcolor=\"#949494\">\n" +
		                "  <th>Session info</th><th>value</th></tr>\n" +
		                "<tr>\n" +
		                "  <td>id</td>\n" +
		                "  <td>" + session.getId() + "</td></tr>\n" +
		                "<tr>\n" +
		                "  <td>Creation Time</td>\n" +
		                "  <td>" + createTime + 
		                "  </td></tr>\n" +
		                "<tr>\n" +
		                "  <td>Time of Last Access</td>\n" +
		                "  <td>" + lastAccessTime + 
		                "  </td></tr>\n" +
		                "<tr>\n" +
		                "  <td>User ID</td>\n" +
		                "  <td>" + userID + 
		                "  </td></tr>\n" +
		                "<tr>\n" +
		                "  <td>Number of visits</td>\n" +
		                "  <td>" + visitCount + "</td></tr>\n" +
		                "</table>\n" +
		                "</body></html>");
		  }
	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doGet(request, response);
	}

}

No matter how many times I hit the servlet, I get different sessionID. Why is the session not being tracked?

It is not displaying the incremented value of visitCount for subsequent requests. Can anyone tell me where am I going wrong?

~ Mansukh

Gaurav Wadhwani

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Posts: 68

posted 11 years ago

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I tried the cde and it works fine in IE. Session id remains same even after refreshing. Also the value is incremented each time.

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