error in request.addCookie(c)

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posted 14 years ago

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Hi, I'm testing out a servlet which will track the user name from a html page.

The servlet is supposed to list the cookie with the user name.

However, when I run the Netbean IDE, it shows me error at the request.addCookie(c);

protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
        PrintWriter out = response.getWriter();
        Cookie[] cookies = request.getCookies();

out.println("<html><head><title>Servlet Cookie2St Information</title>"
	+ "</head><body>");

if ( (cookies == null) || (cookies.length == 0) ){
		out.println("No cookies found");
	} else {
	    out.println("<center><h1>Cookies found in the request</h1></center>"
	    + "<table border><tr><th>Name</th> <th>Value</th><th>Comment</th>"
	    + "<th>Max Age</th></tr>");
	    for (int i=0; i<cookies.length; i++) {
		Cookie c = cookies[i];
		out.println("<tr><td>" + c.getName() + "</td>" +
		"<td>" + c.getValue() + "</td>" +
		"<td>" + c.getComment() + "</td>" +
		"<td>" + Integer.toString(c.getMaxAge()) + "</td></tr>");
	     }
	    out.println("</table>");
	}
	out.println("</body></html>");
	out.flush();
}

protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        String username = request.getParameter("user");
        int cookval = (int) (Math.random() * 5000);
        Cookie c = new Cookie(username, Integer.toString(cookval));
        c.setMaxAge(600);
        request.addCookie(c);
        response.sendRedirect("cookietest.html");
    }

What part have I done wrongly?

Christophe Verré

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posted 14 years ago

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it shows me error at the request.addCookie(c)

Posting the error would help a lot.

Check the following : Is there a addCookie method in HttpServletRequest ? If not, where is this method ?

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tangara goh

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posted 14 years ago

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The error appeared in netbean IDE is just red color so you know there's mistake at that line.

And also when I run the html file, it gives me a blank with nothing appear there.

May I know how to create the addCookie method?

David Newton

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posted 14 years ago

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You don't want to *create* the method, you want to know where it actually *is*.

Hint: There's no point in adding a cookie to a *request*--a new cookie would get sent *back* to the client.

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