Hi,
1. I have used the code below to get hold of the cookie concept using
servlets. I am using JWS1.1.3. I took ideas from Jason's book(its explained
really well). I am submitting a form using GET method . A servlet runs in
response to form submission. This servlet checks whether a cookie with name
"sessionid" is sent from the client. If it finds it, then it displays a
message 'cookie recieved from ur PC' else if it does,nt find any cookie
with name "sessionid" from the client, it sends one to the client with
message 'cookie has been set on ur PC'.
2. I observed that a file sk.txt gets created in JWS's root
directory(JavaWebServer1.1.3). It contains encrypted data like
-919119932375905. I suspect that this is the file which JWS creates for any
cookies. Can somebody confirm this ? Few related questions are
3. Does the browser chooses the file name for cookies , or the servlet
sends it to the browser. I think this is the functionality of the browser.
The browser sees cookies in response headers, and stores them on the client
PC with some random file name.
4. Why does the cookie file gets created in the JWS installation directory
? The client does not have JWS installed! So by default cookie should get
stored in c:\windows\cookies if I am running Win95 or in some other system
directory for other operating systems.
Craig or somebody else can share his experiances over my doubts ? I hope
Jason would not mind me pasting some lines of the code from his book !
-mukul
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
boolean cp = false;;
String sessionid = null;
Cookie[] cookies = request.getCookies();
if(cookies != null)
{
for(int i=0; i < cookies.length; i++)
{
if(cookies[i].getName().equals("sessionid"))
{
sessionid = cookies[i].getValue();
cp = true;
break;
}
}
}
if(sessionid == null)
{
sessionid = generateSessionId();
Cookie c = new Cookie("sessionid",sessionid);
response.addCookie(c);
}
PrintWriter out = new PrintWriter (response.getOutputStream());
out.println("<html>");
out.println("<head><title>cookieServlet</title></head>");
out.println("<body>");
if(cp == true)
{
out.println("<h3>cookie recieved from ur PC</h3>");
}
else
{
out.println("<h3>cookie has been set on ur PC</h3>");
}
out.println("</body></html>");
out.close();
}
private static String generateSessionId()
{
String uid = new java.rmi.server.UID().toString();
return java.net.URLEncoder.encode(uid);
}
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