So deaktivieren Sie Cookies und lösen das Problem der Sitzungs- und Cookie-Zerstörung nach dem Schließen des Browsers

package session;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class WelcomeServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();

        request.getSession();

        String url1 = response.encodeURL("/Session/servlet/SessionDemo1");//禁用cookie才重写，注意禁用cookie后，访问要用127.0.0.1，不能用localhost
        String url2 = response.encodeURL("/Session/servlet/SessionDemo2");        //禁用cookie之后无法解决关闭浏览器能重新访问的问题。
        out.println("<a href=&#39;"+url1+"&#39;>购买  </a>");
        out.println("<a href=&#39;"+url2+"&#39;>结账</a>");
    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {
        doGet(request, response);
    }

}

package session;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;//购买 index.jsp index.html//session基于cookiepublic class SessionDemo1 extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {
        HttpSession session = request.getSession(); //Session创建
        //request.getSession(false);    //不创建session，只获取session  例如：显示购物车

        //解决浏览器关闭后cookie销毁的问题：
        String sessionid = session.getId();
        Cookie cookie = new Cookie("JSESSIONID",sessionid);
        cookie.setPath("/Session");
        cookie.setMaxAge(30*60);
        response.addCookie(cookie);

        session.setAttribute("name", "洗衣机");        //30分钟没使用之后(不管有无关闭浏览器)，Session才销毁（默认，可控制时间）
        //配置方法：在web.xml文件中配置<session-config>里面配置一个<session-timeout>并且设置时间值
        //代码摧毁方法:session.invalidate();
    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {
        doGet(request, response);
    }

}
----------//解决浏览器关闭后session销毁的问题：String sessionid = session.getId();
Cookie cookie = new Cookie("JSESSIONID",sessionid);
cookie.setPath("/Session");
cookie.setMaxAge(30*60);
response.addCookie(cookie);

【解决浏览器关闭后session销毁的原因】：
sessionId是一个cookie，max-age默认为-1，即关闭浏览器后sessionId就会清空 
sessionId（cookie）清空后，自然就无法找到对应的session，所以session就失效了

【解决方法】：
设置上述代码，添加cookie的失效时间，        30分钟没使用之后(不管有无关闭浏览器)，Session才销毁（默认，可控制时间）
        其他session失效时间配置方法：在web.xml文件中配置<session-config>里面配置一个<session-timeout>并且设置时间值
        代码摧毁方法:session.invalidate();

----------package session;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;//结账public class SessionDemo2 extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();

        HttpSession session = request.getSession();
        String product = (String)session.getAttribute("name");
        out.write("你购买的商品是："+product);

    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {
        doGet(request, response);
    }

}