Cookies and session tracking - Revision history

George2 at 09:16, 24 May 2014

2014-05-24T09:16:30Z

George2 at 09:14, 24 May 2014

2014-05-24T09:14:12Z

George2 at 09:13, 24 May 2014

2014-05-24T09:13:12Z

George2 at 09:12, 24 May 2014

2014-05-24T09:12:47Z

George2: Created page with " RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/urlToServlet"); dispatcher.forward(request, response); And this is how to deal with cookies. crea..."

2014-05-24T09:12:08Z

Created page with " RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/urlToServlet"); dispatcher.forward(request, response); And this is how to deal with cookies. crea..."

New page

RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/urlToServlet");
dispatcher.forward(request, response);

And this is how to deal with cookies.

create and send cookies

Cookie userCookie = new Cookie("name", "value");
userCookie.setMaxAge(60*60*24*365); //Store cookie for 1 year
response.addCookie(userCookie);

read cookie from client

String cookieName = "somecookie";
Cookie[] cookies = request.getCookies();
if (cookies != null)
{
for(int i=0; i<cookies.length; i++)
{
Cookie cookie = cookies[i];
if (cookieName.equals(cookie.getName()))
{
doSomethingWith(cookie.getValue());
}
}
}
else
{
//do something else for firsttime visitors
}

Are you using cookies for session tracking? If yes, then use HttpSession. Using HttpSession then there is not need to directly involve with cookies for session tracking.

For example, in a simple login page, this is what you do

HttpSession session = request.getSession();
session.setAttribute("username",username);
In other pages,
if(session.getAttribute("username")==null)
{
//forward to login page.
}

← Older revision		Revision as of 09:16, 24 May 2014
Line 1:		Line 1:
		+	You could send requests to a servlet and then forward requests to another servlet if needed.
		+	In your case, after validation, you can store result in an attribute and then transfer control to another servlet. (if that's what you want to do)
	RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/urlToServlet");		RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/urlToServlet");
	dispatcher.forward(request, response);		dispatcher.forward(request, response);

← Older revision		Revision as of 09:13, 24 May 2014
Line 38:		Line 38:
	In other pages,		In other pages,
	if(session.getAttribute("username")==null)		if(session.getAttribute("username")==null)
−	{	+	{
−	//forward to login page.	+	//forward to login page.
−	}	+	}

@@ Line 6: / Line 6: @@
 create and send cookies
-Cookie userCookie = new Cookie("name", "value");
+ Cookie userCookie = new Cookie("name", "value");
-userCookie.setMaxAge(60*60*24*365); //Store cookie for 1 year
+ userCookie.setMaxAge(60*60*24*365); //Store cookie for 1 year
-response.addCookie(userCookie);
+ response.addCookie(userCookie);
 read cookie from client
-String cookieName = "somecookie";
+  cookieName = "somecookie";
-Cookie[] cookies = request.getCookies();
+ Cookie[] cookies = request.getCookies();
 if (cookies != null)
+{

@@ Line 34: / Line 34: @@
 For example, in a simple login page, this is what you do
-HttpSession session = request.getSession();
+ HttpSession session = request.getSession();
-session.setAttribute("username",username);
+ session.setAttribute("username",username);
-In other pages,
+ In other pages,
-if(session.getAttribute("username")==null)
+ if(session.getAttribute("username")==null)
+{
 //forward to login page.
+}