107c54edc186001d1397f68d816f33bb

一个相对比较简单的留言簿！功能还比较齐全！

package com.pure35.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 com.pure35.database.UserDao;

public class Login extends HttpServlet {
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

	
		UserDao userDao=new UserDao();
		String sql=null;
		boolean isLogin=false;
		String userName=request.getParameter("userName");
		//解决中文用户名无法验证通过问题
		userName=new String(userName.getBytes("iso-8859-1")"gb2312");
		
		String password=request.getParameter("password");
		
		sql="select count(*) as mycount from user where username='"+userName+"'  and password='"+password+"' ";
		System.out.println(sql);
		isLogin=userDao.login(sql);
		if(isLogin)
		{	request.getSession().setAttribute("username", userName);
			request.getRequestDispatcher("welcome.jsp").forward(request, response);		
		}
		else{
			request.setAttribute("error","非法登陆!"); 
			request.getRequestDispatcher("login.jsp").forward(request, response);
		}
		
	}

}