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8.4 Examples of Setting and Reading Cookies
187
Listing 8.1 SetCookies.java
package coreservlets;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
/** Sets six cookies: three that apply only to the current
* session (regardless of how long that session lasts)
* and three that persist for an hour (regardless of
* whether the browser is restarted).
*/
public class SetCookies extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
for(int i=0; i<3; i++) {
// Default maxAge is 1, indicating cookie
// applies only to current browsing session.
Cookie cookie = new Cookie("Session Cookie " + i,
"Cookie Value S" + i);
response.addCookie(cookie);
cookie = new Cookie("Persistent Cookie " + i,
"Cookie Value P" + i);
// Cookie is valid for an hour, regardless of whether
// user quits browser, reboots computer, or whatever.
cookie.setMaxAge(3600);
response.addCookie(cookie);
}
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String title = "Setting Cookies";
out.println
(ServletUtilities.headWithTitle(title) +
"\n" +
"" + title + "
\n" +
"There are six cookies associated with this page.\n" +
"To see them, visit the\n" +
"\n" +
"ShowCookies servlet.\n" +
"\n" +
"Three of the cookies are associated only with the\n" +
"current session, while three are persistent.\n" +
"Quit the browser, restart, and return to the\n" +
"ShowCookies servlet to verify that\n" +
"the three long lived ones persist across sessions.\n" +
"