爱心技术专栏专题

实例4(cookie)

摘录:JspServlet 来源:JspServlet 加入时间:2007年04月30日
摘要:
实例4(cookie)

package coreservlets;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

/** Sets six cookies: three that apply only to the current
*  sess…

实例4(cookie)

站点:爱心种子小博士 关键字:实例4(cookie)

实例4(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/.
*  © 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; 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) +
       "<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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