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我正在使用 Servlet 开发一些东西。我正在这个程序中创建 cookie，并且正在创建一个名为 JSESSIONID 的 cookie，但是当我注释掉所有代码时，即使创建了 cookie。这是我的代码:
CookieDemoServlet.java:
public class CookieDemoServlet extends HttpServlet {
public void service(HttpServletRequest req, HttpServletResponse res) throws
ServletException, IOException {
/*String em = req.getParameter("email");
Cookie ck[] = req.getCookies();
if (ck != null) {
if (ck.length != 0) {
for (Cookie c : ck) {
String cn = c.getName();
if (cn.equals("JSESSIONID")) {
System.out.println("You are the Old User");
String cv = c.getValue();
String d = c.getDomain();
System.out.println(cn + "\t:" + cv + "\t:" + d);
}
} else {
System.out.println("Sorry,No Cookies Found");
}
}
HttpSession session = req.getSession();
boolean b = session.isNew();
if (b) {
System.out.println("You are the New user");
} else {
System.out.println("You are the Old User");
}
Cookie c1 = new Cookie("Email", em);
res.addCookie(c1);
Cookie c2 = new Cookie("Phone", "99999");
res.addCookie(c2);*/
RequestDispatcher rd = req.getRequestDispatcher("cookiedemo.jsp");
rd.forward(req, res);
}
}
}
可能是什么原因？