package?com.xushouwei.controller;

import?java.io.IOException;
import?java.io.PrintWriter;
import?java.util.*;

import?javax.servlet.ServletException;
import?javax.servlet.http.HttpServlet;
import?javax.servlet.http.HttpServletRequest;
import?javax.servlet.http.HttpServletResponse;

import?com.xushouwei.domain.Users;
import?com.xushouwei.service.BooksService;
import?com.xushouwei.service.MyCar;
import?com.xushouwei.service.UsersService;

public?class?GoHallUI?extends?HttpServlet?{

	/**
	?*?The?doGet?method?of?the?servlet.?

	?*
	?*?This?method?is?called?when?a?form?has?its?tag?value?method?equals?to?get.
	?*?
	?*?@param?request?the?request?send?by?the?client?to?the?server
	?*?@param?response?the?response?send?by?the?server?to?the?client
	?*?@throws?ServletException?if?an?error?occurred
	?*?@throws?IOException?if?an?error?occurred
	?*/
	public?void?doGet（HttpServletRequest?request?HttpServletResponse?response）
			throws?ServletException?IOException?{

		response.setContentType（“text/html;charset=gb2312“）;
		PrintWriter?out?=?response.getWriter（）;
		//先判斷該用戶是否已經登錄但是這么做代碼的可讀性差了點
		if（request.getSession（）.getAttribute（“loginUser“）!=null）
		{
			//給下一個頁面hall.jsp準備要現實的數據
			BooksService?booksService=new?BooksService（）;
			ArrayList?al=booksService.getAllBook（）;
			//用戶驗證合法后就創建一個購物車
			//MyCar?myCar=new?MyCar（）;
			//request.getSession（）.setAttribute（“myCar“?myCar）;
			//把要顯示的數據放入request，原因是request對象的生命周期最短
			request.setAttribute（“books“?al）;
			//說明是合法用戶跳轉到購物大廳頁面
			request.getRequestDispatcher（“WEB-INF/hall.jsp“）.forward（request?response）;
			return;
		}
		//得到從登陸頁面傳遞過來的用戶名和密碼
		String?uid=request.getParameter（“userid“）;
		String?p=request.getParameter（“password“）;
		//創建一個Users對象
		//方法一
		//Users?loginUser=new?Users（）;
		//loginUser.setName（u）;
		//loginUser.setPwd（p）;
		//方法二
		Users?loginUser=new?Users（Integer.parseInt（uid）p）;
		//使用業務邏輯類完成驗證
		UsersService?usersService=new?UsersService（）;
		if（usersService.checkUser（loginUser））
		{
			//因為在其他的頁面可能使用到用戶信息，因此我們可以把用戶信息放入session中
			request.getSession（）.setAttribute（“loginUser“?loginUser）;
			//給下一個頁面hall.jsp準備要現實的數據
			BooksService?booksService=new?BooksService（）;
			ArrayList?al=booksService.getAllBook（）;
			//用戶驗證合法后就創建一個購物車
			MyCar?myCar=new?MyCar（）;
			request.getSession（）.setAttribute（“myCar“?myCar）;
			//把要顯示的數據放入request，原因是request對象的生命周期最短
			request.setAttribute（“books“?al）;
			//說明是合法用戶跳轉到購物大廳頁面
			request.getRequestDispatcher（“WEB-INF/hall.jsp“）.forward（request?response）;
		}
		else
		{
			request.getRequestDispatcher（“WEB-INF/login.jsp“）.forward（request?response）;
		}
		
	}

	/**
	?*?The?doPost?method?of?the?servlet.?

	?*
	?*?This?method?is?called?when?a?form?has?its?tag?value?method?equals?to?post.
	?*?
	?*?@param?request?the?request?send?by?the?client?to?the?server
	?*?@param?response?the?response?send?by?the?server?to?the?client
	?*?@throws?ServletException?if?an?error?occur

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2015-08-06?21:48??shopCar\
?????文件????????1093??2015-07-30?21:26??shopCar\.classpath
?????文件????????1332??2015-07-30?21:38??shopCar\.project
?????目錄???????????0??2015-08-06?21:48??shopCar\.settings\
?????文件?????????522??2015-07-30?21:26??shopCar\.settings\.jsdtscope
?????文件?????????364??2015-07-30?21:26??shopCar\.settings\org.eclipse.jdt.core.prefs
?????文件?????????480??2015-07-30?21:26??shopCar\.settings\org.eclipse.wst.common.component
?????文件?????????414??2015-07-30?21:26??shopCar\.settings\org.eclipse.wst.common.project.facet.core.xml
?????文件??????????49??2015-07-30?21:26??shopCar\.settings\org.eclipse.wst.jsdt.ui.superType.container
?????文件???????????6??2015-07-30?21:26??shopCar\.settings\org.eclipse.wst.jsdt.ui.superType.name
?????文件????????2271??2015-08-02?20:36??shopCar\shopCar.sql
?????目錄???????????0??2015-08-06?21:48??shopCar\src\
?????目錄???????????0??2015-08-06?21:48??shopCar\src\com\
?????目錄???????????0??2015-08-06?21:48??shopCar\src\com\xushouwei\
?????目錄???????????0??2015-08-06?21:48??shopCar\src\com\xushouwei\controller\
?????文件????????3690??2015-08-06?17:10??shopCar\src\com\xushouwei\controller\GoHallUI.java
?????文件????????1947??2015-08-06?17:18??shopCar\src\com\xushouwei\controller\GoMyOrderServlet.java
?????文件????????2006??2015-08-06?17:18??shopCar\src\com\xushouwei\controller\GoShowMyCar.java
?????文件????????4064??2015-08-06?21:39??shopCar\src\com\xushouwei\controller\ShopClServlet.java
?????文件????????2481??2015-08-06?21:31??shopCar\src\com\xushouwei\controller\SubmitOrderServlet.java
?????目錄???????????0??2015-08-06?21:48??shopCar\src\com\xushouwei\domain\
?????文件????????1174??2015-08-01?20:54??shopCar\src\com\xushouwei\domain\Books.java
?????文件?????????973??2015-08-01?20:23??shopCar\src\com\xushouwei\domain\Users.java
?????目錄???????????0??2015-08-06?21:48??shopCar\src\com\xushouwei\service\
?????文件????????1586??2015-08-06?17:15??shopCar\src\com\xushouwei\service\BooksService.java
?????文件????????2061??2015-08-02?17:35??shopCar\src\com\xushouwei\service\MyCar.java
?????文件????????2200??2015-08-06?17:57??shopCar\src\com\xushouwei\service\OrdersService.java
?????文件????????5166??2015-08-06?21:29??shopCar\src\com\xushouwei\service\SendMail.java
?????文件?????????854??2015-08-01?20:23??shopCar\src\com\xushouwei\service\UsersService.java
?????目錄???????????0??2015-08-06?21:48??shopCar\src\com\xushouwei\utils\
?????文件????????2168??2015-08-05?17:50??shopCar\src\com\xushouwei\utils\DBUtil.java
............此處省略42個文件信息