用户登录的servlet

package com.sxt.servlet;

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;

import com.sxt.bean.Guser;
import com.sxt.dao.GuserDao;
import com.sxt.dao.impl.GuserDaoImpl;

public class LoginServlet extends HttpServlet {

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 username = request.getParameter("username");
    String userpwd = request.getParameter("userpwd");
    GuserDao dao = new GuserDaoImpl();
    try {
        Guser g = dao.login(username, userpwd);
        PrintWriter out = response.getWriter();
        // 判断是否登录成功
        if(g!=null){
            g.setUserpwd("");
            HttpSession session = request.getSession();
            session.setAttribute("g", g);
            out.print("1");
        }else{
            out.print("0");
        }
        out.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

}