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    jsp源码实例5(cookie)
    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).
    * P>
    * Taken from Core Servlets and JavaServer Pages
    * from Prentice Hall and Sun Microsystems Press,
    * http://www.coreservlets.com/.
    * copy; 2000 Marty Hall; may be freely used or adapted.
    */

    public class SetCookies extends HttpServlet {
    public void doGet(HttpServletRequest request,
    HttpServletResponse response)
    throws ServletException, IOException {
    for(int i=0; i3; 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) +
    "BODY BGCOLOR=\&;#FDF5E6\&;>\n" +
    "H1 ALIGN=\&;CENTER\&;>" + title + "/H1>\n" +
    "There are six cookies associated with this page.\n" +
    "To see them, visit the\n" +
    "A HREF=\&;/servlet/coreservlets.ShowCookies\&;>\n" +
    "CODE>ShowCookies/CODE> servlet/A>.\n" +
    "P>\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" +
    "CODE>ShowCookies/CODE> servlet to verify that\n" +
    "the three long-lived ones persist across sessions.\n" +
    "/BODY>/HTML>");
    }
    }
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