loginservlet.java~4~

通过jsp,servlet,javaBean,三成架构实现的好友通讯录系统

package com.servelet;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import com.Dao.userDao;
import com.entity.*;

public class LoginServlet extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=GBK";

    //Initialize global variables
    public void init() throws ServletException {
    }

    //Process the HTTP Get request
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
       doPost(request, response);
    }

    //Process the HTTP Post request
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
         response.setContentType(CONTENT_TYPE);
         String name=request.getParameter("userName");
         String password=request.getParameter("password");

         userDao userdao=new userDao();
         UserBean user=userdao.findUser(name,password);
         if(user==null || user.getUserName()==null)
         {
             request.getRequestDispatcher("index.jsp").forward(request,response);
         }
         else
         {//如果登陆成功 保存用户信息到Session 中  已被以后需要用到用户信息
             HttpSession session=request.getSession();
             session.setAttribute("user",user);
             request.getRequestDispatcher("Test.jsp").forward(request,response);
         }
    }

    //Clean up resources
    public void destroy() {
    }
}