loginservlet.java

点餐系统 非常好的 jsp mysql 我也是别人那里下载来的

package Controler;
import DAO.UserDAO;
import Entity.UserBean;
import Entity.UserBean;
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;

public class LoginServlet extends HttpServlet {
	
	public LoginServlet() {
		super();
	}
	
	public void destroy() {
		super.destroy();
		
	}

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

		
		String user_id=request.getParameter("user_id");	   
		String password=request.getParameter("password");
		
		UserDAO ud=new UserDAO();
		UserBean bean=new UserBean();
		 System.out.println("loginserlvet");
		
		if(user_id!=null&&password!=null)
		{
	
		if(bean!=null)
		{
			user_id= new String(user_id.getBytes("iso8859-1"),"GBK");
			password= new String(password.getBytes("iso8859-1"),"GBK");
			bean=ud.CheckLogin(user_id, password);	
			if(bean!=null)
			{			
			HttpSession session=request.getSession();
			session.setAttribute("login", bean);			
			response.sendRedirect("/Project_Food/Index.jsp");			
			}
			else
			{
			request.getSession().setAttribute("mms", "登录失败！");
			response.sendRedirect("/Project_Food/Index.jsp");
				
			}
		}
		}
		
		
		
	}

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

	
	public void init() throws ServletException {
		
	}

}