日期:2014-05-17  浏览次数:20761 次

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()                                                                                                                                                                                                                                                                                                                                                                            
    {
        
        supe