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session取值替空

热度:1604   发布时间:2013-02-25 21:12:36.0
session取值为空
登录成功 ,登录数据已经存入session ,经验证取证正常。但是向数据库添加数据的过程中 session取值竟然为空。费解!!



1.登录servlet 登录成功并转向,session成功写入。
Java code
package ser;import impl.AccountImpl;import it.shopping.dao.IAccount;import it.shopping.pojo.Account;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class AccountSer extends HttpServlet{       private IAccount accountImpl = new AccountImpl();      private static final long serialVersionUID = -3708568559174453120L;      public AccountSer()   {       super();   }         public void destroy()    {        super.destroy(); // Just puts "destroy" string in log        // Put your code here    }        public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException    {    this.doPost(request, response);    }        public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException    {                 String status = request.getParameter("status");        if(status.equals("login"))        {                Account account = new Account();        account.setAlogin(request.getParameter("alogin"));        account.setApass(request.getParameter("apass"));         account =accountImpl.queryAccount(account);                    if(account == null)        {            request.setAttribute("error", "登录失败");            request.getRequestDispatcher("/alogin.jsp").forward(request, response);        //    response.sendRedirect("alogin.jsp");        }                {                      request.getSession().setAttribute("account", account);         // response.sendRedirect("/t31/admin/index.jsp");         // 重定向和请求装啊session值都不会失效!           request.getRequestDispatcher("/admin/index.jsp").forward(request, response);                              }        }    }                 public void init() throws ServletException    {        // Put your code here        }}


2.跳转至index.jsp成功,然后添加数据成功,跳转至servlet 即CategorySer.java成功
但是在category.setAccount((Account) req.getSession().getAttribute("account"));
session 取值竟然为空!!求解释!!
Java code
package ser;import impl.CategoryImpl;import it.shopping.dao.ICategory;import it.shopping.pojo.Account;import it.shopping.pojo.Category;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class CategorySer extends HttpServlet{        private ICategory categoryImpl = new CategoryImpl();        public void destroy()                                                                                                                                                                                                                                                                                                                                                                                {                super.destroy();            }@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp)        throws ServletException, IOException{    this.doPost(req,resp);}@Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp)            throws ServletException, IOException    {        String status = req.getParameter("status");             if(status.equals("savaCategory"));    {             Category category = new Category();    category.setCtype(req.getParameter("ctype"));        category.setChot(Boolean.parseBoolean(req.getParameter("chot")));    category.setAccount((Account) req.getSession().getAttribute("account"));        System.out.println(category.getAccount());    categoryImpl.queryCategory(category);                resp.sendRedirect("/t31/admin/main.jsp");        }                            }        public void init() throws ServletException    {                }}
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