loginservlet.java

用mysql

package com.wenhua.ser.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

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.wenhua.ser.dao.UserDao;

public class LoginServlet extends HttpServlet {

	public void destroy() {
		super.destroy();
	}

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

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

		request.setCharacterEncoding("GBK");
		response.setCharacterEncoding("GBK");
		boolean flag = false;		//标识用户名和密码是否合法

		//第一步 ，从前台获得参数
		String userName = request.getParameter("userName");
		String password = request.getParameter("password");

		//判断用户名和密码是否合法
		UserDao userDao = new UserDao();
		flag = userDao.checkUser(userName, password);
		
		HttpSession session = request.getSession();
		
		//
		if(userName.equals("admin")&&password.equals("123"))
		{
			session.setAttribute("userName", userName);
			request.getRequestDispatcher("leader.html").forward(request, response);
			return;
		}
			

		if (flag) {
			
			List list = new ArrayList();
			list = userDao.findAll();
			
			
//			request.setAttribute("userName1", userName);
			session.setAttribute("userName", userName);
			
			request.setAttribute("result", list);
			
			request.getRequestDispatcher("wsuccess.jsp").forward(request, response);
			
		} else {
			
			
			request.getRequestDispatcher("MyJsp1.jsp").forward(request, response);
		}
		
		

		
	}

	public void init() throws ServletException {
		// Put your code here
	}

}