Servlet处理Cookies_使用findservlet打印cookie-优快云博客

本文介绍了一个简单的示例，展示如何通过Servlet读取和设置HTTP Cookies。利用CookieServlet类，可以获取客户端发送的Cookies，并更新它们的有效期。

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用Servlet中定义的cookie类处理cookies

1.JSP代码(form)：

<%--
    Document   : testCookie
    Created on : 2009-10-9, 14:38:59
    Author     : lucifer
--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
         <form method="post" action="CookieServlet">
              <input type="text" name=username">
              <input type="password" name="password">
              <input type="submit" value="submit">
         </form>
    </body>
</html>

2.Servlet:(名字是CookieServlet)

package MyServlet;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.*;

/**
*
* @author lucifer
*/
public class CookieServlet extends HttpServlet {

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        Cookie cookies[] = request.getCookies();
        try {
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet CookieServlet</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet CookieServlet at " + request.getRequestURI() + "</h1>");
            if((cookies == null)||(cookies.length == 0)){
                 out.println("no cookie!");
            }
            else{
                 out.println("<center><table border><tr>" +
                         "<th>Name</th>" +
                         "<th>Value</th>" +
                         "<th>Comment</th>" +
                         "<th>MaxAge</th>" +
                         "</tr>");
                 for(int i = 0;i < cookies.length;i++){
                      Cookie c = cookies[i];
                      c.setMaxAge(3600);
                      out.println("<tr>" +
                              "<td>" + c.getName() + "</td>" +
                              "<td>" + c.getValue() + "</td>" +
                              "<td>" + c.getComment() + "</td>" +
                              "<td>" + c.getMaxAge() + "</td>" +
                              "</tr>");
                 }
                 out.println("</table></center>");
            }
            out.println("</body>");
            out.println("</html>");
            out.flush();
        } finally {
            out.close();
        }
    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    @Override
    public String getServletInfo() {
        return "Short description";
    }
}