jsp电子商务 购物车实现之二 登录和分页篇

  

   

    

     

    
    

     

      <div id="login">
     
    
   

    

     

    
    

     
		<h2>用户登陆</h2>
     
    
   

    

     

    
    

     
		<form method="post" action="LoginServlet" οnsubmit="return check()">
     
    
   

    

     

    
    

     
			<dl>
     
    
   

    

     

    
    

     
				<dt>用户名：</dt>
     
    
   

    

     

    
    

     
				<dd><input class="input-text" type="text" id="username" name="username" οnblur="isUsernameNull()"/><span id="usernull"></span></dd>
     
    
   

    

     

    
    

     
				<dt>密　码：</dt>
     
    
   

    

     

    
    

     
				<dd><input class="input-text" type="password" id="password" name="password" οnblur="isPasswordNull()"/><span id="pwdnull"></span></dd>
     
    
   

    

     

    
    

     
				<dt> </dt>
     
    
   

    

     

    
    

     
				<dd class="button"><input class="input-btn" type="submit" name="submit" value="" />
     
    
   

    

     

    
    

     
				<input class="input-reg" type="button" name="register" 
     
    
   

    

     

    
    

     
				value="" οnclick="window.location='register.jsp';" /></dd>
     
    
   

    

     

    
    

     
			</dl>
     
    
   

    

     

    
    

     
		</form>
     
    
   

    

     

    
    

     
	</div>
     
    
  
 

LoginServlet的参考代码：

  

   

    

     

    
    

     

      public void doPost(HttpServletRequest request, HttpServletResponse response)
     
    
   

    

     

    
    

     
			throws ServletException, IOException {
     
    
   

    

     

    
    

     
		String username = request.getParameter("username");
     
    
   

    

     

    
    

     
		String password = request.getParameter("password");
     
    
   

    

     

    
    

     
		
     
    
   

    

     

    
    

     
		UserinfoDao ud = new UserinfoDaoImpl();
     
    
   

    

     

    
    

     
		
     
    
   

    

     

    
    

     
		Userinfo userinfo = ud.findByNameAndPwd(username, password);
     
    
   

    

     

    
    

     
		//如果登陆成功，则去bookListServlet
     
    
   

    

     

    
    

     
		if(userinfo!=null){
     
    
   

    

     

    
    

     

      			request.getSession().setAttribute("userinfo", userinfo);
     
    
   

    

     

    
    

     

      			response.sendRedirect("BooklistServlet");
     
    
   

    

     

    
    

     

      		}
     
    
   

    

     

    
    

     
		else{
     
    
   

    

     

    
    

     

      			response.sendRedirect("login.jsp");
     
    
   

    

     

    
    

     

      		}
     
    
   

    

     

    
    

     
		
     
    
   

    

     

    
    

     

      	}
     
    
  
 

  

   

    

     

    
    

     

      protected void doPost(HttpServletRequest req, HttpServletResponse resp)
     
    
   

    

     

    
    

     
			throws ServletException, IOException {
     
    
   

    

     

    
    

     
		String page = req.getParameter("page");
     
    
   

    

     

    
    

     
		if(page==null){
     
    
   

    

     

    
    

     

      			page="1";//第一次传过来就是默认首页
     
    
   

    

     

    
    

     

      		}
     
    
   

    

     

    
    

     
		int pageindex = Integer.parseInt(page);//否则，可能是第2页等
     
    
   

    

     

    
    

     
		BookDao bd = new BookDaoImpl();
     
    
   

    

     

    
    

     

      		List<Book> books = bd.findBookByPage(pageindex, 3);//3：每页多少数据
     
    
   

    

     

    
    

     
		int count = bd.count();
     
    
   

    

     

    
    

     
		PageControler pc = new PageControler();
     
    
   

    

     

    
    

     
		int total = pc.getTotalPages(count, 3);//总页数
     
    
   

    

     

    
    

     
		//通过request设置属性,+forward转向；
     
    
   

    

     

    
    

     
		
     
    
   

    

     

    
    

     

      		req.setAttribute("pageindex", pageindex);
     
    
   

    

     

    
    

     

      // HttpSession session=req.getSession();
     
    
   

    

     

    
    

     

      // session.setAttribute("books",books); 也可以，可以直接跳转;
     
    
   

    

     

    
    

     

      		req.setAttribute("books",books);
     
    
   

    

     

    
    

     

      		req.setAttribute("total",total);
     
    
   

    

     

    
    

     
		
     
    
   

    

     

    
    

     

      		req.getRequestDispatcher("index.jsp").forward(req,resp);
     
    
   

    

     

    
    

     

      	}
     
    
  
 

  

   

    

     

    
    

     

      <div id="content" class="wrap">
     
    
   

    

     

    
    

     
	<div class="list bookList">
     
    
   

    

     

    
    

     
		<form method="post" name="shoping" action="CartServlet" οnsubmit="return checkCart();">
     
    
   

    

     

    
    

     
			<table>
     
    
   

    

     

    
    

     
				<tr>
     
    
   

    

     

    
    

     
					<th class="checker">@</th>
     
    
   

    

     

    
    

     
					<th>书名</th>
     
    
   

    

     

    
    

     
					<th class="info">简介</th>
     
    
   

    

     

    
    

     
					<th class="price">价格</th>
     
    
   

    

     

    
    

     
					<th class="store">库存</th>
     
    
   

    

     

    
    

     
					<th class="view">图片预览</th>
     
    
   

    

     

    
    

     
				</tr>
     
    
   

    

     

    
    

     
					<c:forEach items="${books}" var="book"><!--book.id的值可以存放value -->
     
    
   

    

     

    
    

     
					<tr>
     
    
   

    

     

    
    

     
						<td><input type="checkbox" name="bookId" value="${book.id}" /></td>
     
    
   

    

     

    
    

     
						<td class="title">${book.bookname}</td>
     
    
   

    

     

    
    

     
						<td class="info">${book.info}</td>
     
    
   

    

     

    
    

     
						<td>￥${book.price}</td>
     
    
   

    

     

    
    

     
						<td>${book.stock}</td>
     
    
   

    

     

    
    

     
						<td class="thumb"><img src="images/book/${book.image}" /></td>
     
    
   

    

     

    
    

     
					</tr>
     
    
   

    

     

    
    

     
					</c:forEach>
     
    
   

    

     

    
    

     
					
     
    
   

    

     

    
    

     
				
     
    
   

    

     

    
    

     
			</table>
     
    
   

    

     

    
    

     
			
     
    
   

    

     

    
    

     
			<div class="page-spliter">
     
    
   

    

     

    
    

     
				<a href="BooklistServlet?page=1">首页</a>
     
    
   

    

     

    
    

     
					
     
    
   

    

     

    
    

     
				<c:if test="${pageindex>1}">
     
    
   

    

     

    
    

     
					<a href="BooklistServlet?page=${pageindex-1}">上一页</a>
     
    
   

    

     

    
    

     
				</c:if>
     
    
   

    

     

    
    

     
				
     
    
   

    

     

    
    

     
				<c:if test="${pageindex<total}">
     
    
   

    

     

    
    

     
					<a href="BooklistServlet?page=${pageindex+1}">下一页</a>
     
    
   

    

     

    
    

     
				</c:if>
     
    
   

    

     

    
    

     
					
     
    
   

    

     

    
    

     
				<a href="BooklistServlet?page=${total}">尾页</a>
     
    
   

    

     

    
    

     
			</div>
     
    
   

    

     

    
    

     
			
     
    
   

    

     

    
    

     
			<div class="button">
     
    
   

    

     

    
    

     
			<input class="input-btn" type="submit"
     
    
   

    

     

    
    

     
			 name="submit" value="" /></div>
     
    
   

    

     

    
    

     
		</form>
     
    
   

    

     

    
    

     
	</div>
     
    
   

    

     

    
    

     

      </div>
     
    
  
 

文章来源: aaaedu.blog.csdn.net，作者：tea_year，版权归原作者所有，如需转载，请联系作者。

原文链接：aaaedu.blog.csdn.net/article/details/53455314