b095aeda2487001d146e9d053166f5f1

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 java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;


import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//import javax.swing.JOptionPane;


import com.pure35.database.Dao;
import com.pure35.database.User;
import com.pure35.database.Database;


public class LoginC extends HttpServlet {
	
	Connection con=null;
	ResultSet rs=null;
	Statement sm=null;
	public void doPost(HttpServletRequest req, HttpServletResponse res)
	throws ServletException, IOException {
	
	
		
		//String domethod=req.getParameter("domethod");
		String str="该用户不存在";
		//if(domethod.equals("login")){
		
			boolean isLogin=false;
			
				try {
					isLogin=this.login(req,res);
				} catch (ClassNotFoundException e) {
					e.printStackTrace();
				}
				
		 if(isLogin)
		   {
			   req.getRequestDispatcher("success.jsp").forward(req, res);
		   }
		 else
		 {
			 
			 req.setAttribute("result", str);
			 //JOptionPane.showMessageDialog(null, str);
			 req.getRequestDispatcher("Login.jsp").forward(req, res);
		 }
		 
	}
	/**
	 * 
	 * 登陆
	 * @param request
	 * @param response
	 * @return
	 */	
	public boolean login(HttpServletRequest req, HttpServletResponse res) throws ClassNotFoundException {
		//从页面获取提交的数据
		String n=req.getParameter("username");
		String p=req.getParameter("password");
		Dao dao=new Dao();
		User user=new User();
		//通过set方法设置user的属性，把页面获取的数据赋给user
		user.setUsername(n);
		user.setPassword(p);
		
		boolean bool= false;
		bool=dao.login(user);
		
		return bool;
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	public void init() throws ServletException {

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

}