Source Code : Cookie Demo

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Cookie Demo

    

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CookieServlet extends HttpServlet {
  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, java.io.IOException {

    Cookie cookie = null;
    Cookie[] cookies = request.getCookies();
    boolean newCookie = false;

    if (cookies != null) {
      for (int i = 0; i < cookies.length; i++) {
        if (cookies[i].getName().equals("mycookie")) {
          cookie = cookies[i];
        }
      }
    }
    if (cookie == null) {
      newCookie = true;
      int maxAge;
      try {
        maxAge = new Integer(getServletContext().getInitParameter(
            "cookie-age")).intValue();
      } catch (Exception e) {
        maxAge = -1;
      }

      cookie = new Cookie("mycookie", "" + getNextCookieValue());
      cookie.setPath(request.getContextPath());
      cookie.setMaxAge(maxAge);
      response.addCookie(cookie);
    }
    response.setContentType("text/html");
    java.io.PrintWriter out = response.getWriter();

    out.println("<html>");
    out.println("<head>");
    out.println("<title>Cookie info</title>");
    out.println("</head>");
    out.println("<body>");

    out
        .println("<h2> Information about the cookie named "mycookie"</h2>");

    out.println("Cookie value: " + cookie.getValue() + "<br>");
    if (newCookie) {
      out.println("Cookie Max-Age: " + cookie.getMaxAge() + "<br>");
      out.println("Cookie Path: " + cookie.getPath() + "<br>");
    }

    out.println("</body>");
    out.println("</html>");

    out.close();
  }

  private long getNextCookieValue() {
    return new java.util.Date().getTime();

  }

  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, java.io.IOException {

    doGet(request, response);
  }
}

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