checkuserloginservlet.java

java网上订餐系统java网上订餐系统java网上订餐系统

package com.action;

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

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.bo.UserInfoBo;
import com.vo.UserInfo;
import com.bo.FoodInfoBo;

public class CheckUserLoginServlet extends HttpServlet {


	public CheckUserLoginServlet() {
		super();
	}


	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}


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

		response.setContentType("text/html;charset=UTF-8");
		PrintWriter out = response.getWriter();
		//取值，用户名和密码
		String userName = request.getParameter("loginName");
		String userPwd = request.getParameter("loginPass");
		//后台判断,用户名和密码
		if(userName==null||"".equals(userName)){
			out.print("用户名不能为空,请<a href='javascript:history.go(-1)'>返回<a/>重新登录！！！");
			out.close();
			return;
		}
		if(userPwd==null||"".equals(userPwd)){
			out.print("密码不能为空,请<a href='javascript:history.go(-1)'>返回<a/>重新登录！！！");
			out.close();
			return;
		}
		HttpSession session = request.getSession();
		//取数据库值，调BO层
		ArrayList list = UserInfoBo.createUserInfoBo().selectUserInfo();
		//用迭代取出ArrayList里的值
		Iterator it = list.iterator();
		while(it.hasNext()){
			Object obj = it.next();
			UserInfo userInfo = (UserInfo) obj;
			//取到数据库里的用户名和密码
			String daoName = userInfo.getLoginName();
			String daoPwd = userInfo.getLoginPass();
			//判断用户名和密码是否一至
			if(userName.equals(daoName) && userPwd.equals(daoPwd)){
				//查询食物的信息
				session.setAttribute("foodInfo", FoodInfoBo.createFoodInfoBo().selectFoodInfo());
				//转发				
				request.getRequestDispatcher("view/show.jsp").forward(request, response);
				return;
			}
		}
		//如果是错误回到本页，并带了一条信息过去
		request.setAttribute("erroInfo", "true");
		request.getRequestDispatcher("view/login.jsp").forward(request, response);
		out.close();
	}

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

		doGet(request,response);
	}


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

}