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點(diǎn)擊顯示購物車 但出來的卻是添加購物車成功頁面(也就是success頁面)并且數(shù)量顯示null,id也顯示null。不知道代碼哪里出了錯誤

package?servlet;import?java.io.IOException;import?java.io.PrintWriter;import?javax.servlet.ServletException;import?javax.servlet.annotation.WebServlet;import?javax.servlet.http.HttpServlet;import?javax.servlet.http.HttpServletRequest;import?javax.servlet.http.HttpServletResponse;import?dao.ItemsDAO;import?entity.Cart;import?entity.Items;/**?*?Servlet?implementation?class?CartServlet?*/@WebServlet("/CartServlet")public?class?CartServlet?extends?HttpServlet?{	private?static?final?long?serialVersionUID?=?1L;		private?String?action;//表示購物車的動作?,add,show,delete		private?ItemsDAO?idao?=?new?ItemsDAO();//商品業(yè)務(wù)邏輯類的對象,比如根據(jù)編號獲得商品???????????/**?????*?@see?HttpServlet#HttpServlet()?????*/????public?CartServlet()?{????????super();????????//?TODO?Auto-generated?constructor?stub????}	/**	*?@see?HttpServlet#doGet(HttpServletRequest?request,?HttpServletResponse?response)	*/	protected?void?doGet(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException?{		//?TODO?Auto-generated?method?stub		doPost(request,?response);	}	/**	*?@see?HttpServlet#doPost(HttpServletRequest?request,?HttpServletResponse?response)	*/	protected?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException?{		//?TODO?Auto-generated?method?stub				response.setContentType("text/html;charset=utf-8");		PrintWriter?out?=?response.getWriter();		if(request.getParameter("action")!=null)		{			//把獲得的動作賦給action屬性			this.action?=?request.getParameter("action");			if(action.equals("add"))?//如果是添加商品進(jìn)購物車			{				if(addToCart(request,response))				{					request.getRequestDispatcher("/success.jsp").forward(request,?response);				}				else				{					request.getRequestDispatcher("/failure.jsp").forward(request,?response);				}			}			if(action.equals("show"))//如果是顯示購物車			{				request.getRequestDispatcher("/cart.jsp").forward(request,?response);			}			if(action.equals("delete"))?//如果是執(zhí)行刪除購物車中的商品			{				if(deleteFromCart(request,response))//如果刪除成功				{					request.getRequestDispatcher("/cart.jsp").forward(request,?response);				}				else				{					request.getRequestDispatcher("/cart.jsp").forward(request,?response);				}			}		}	}		//添加商品進(jìn)購物車的方法	private?boolean?addToCart(HttpServletRequest?request,?HttpServletResponse?response)	{		String?id=request.getParameter("id");		String?number=request.getParameter("num");		Items?item=idao.getItemsById(Integer.parseInt(id));//根據(jù)商品id獲取商品資料				//是否第一次給購物車添加商品。若是,則session中以前沒有購物車對象		if(request.getSession().getAttribute("cart")==null)		{			Cart?cart=?new?Cart();			request.getSession().setAttribute("cart",?cart);		}		//若不是第一次購買則直接獲得一個cart對象		Cart?cart=(Cart)?request.getSession().getAttribute("cart");		if(cart.addGoodsInCart(item,?Integer.parseInt(number)))		{			return?true;		}		else		{			return?false;		}	}		private?boolean?deleteFromCart(HttpServletRequest?request,?HttpServletResponse?response)	{		String?id?=?request.getParameter("id");		Cart?cart?=?(Cart)request.getSession().getAttribute("cart");	????Items?item?=?idao.getItemsById(Integer.parseInt(id));	????if(cart.removeGoodsInCart(item))	????{	????	return?true;	????}	????else	????{	????	return?false;	????}	}}
?<%@?page?language="java"?import="java.util.*"?contentType="text/html;?charset=utf-8"?%><%@?page?import="entity.Items"%><%@?page?import="dao.ItemsDAO"%><%String?path?=?request.getContextPath();String?basePath?=?request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN"><html>??<head>????<base?href="<%=basePath%>">????????<title>My?JSP?'details.jsp'?starting?page</title>????	<meta?http-equiv="pragma"?content="no-cache">	<meta?http-equiv="cache-control"?content="no-cache">	<meta?http-equiv="expires"?content="0">????	<meta?http-equiv="keywords"?content="keyword1,keyword2,keyword3">	<meta?http-equiv="description"?content="This?is?my?page">	<!--	<link?rel="stylesheet"?type="text/css"?href="styles.css">	-->	<link?href="css/main.css"?rel="stylesheet"?type="text/css">	<script?type="text/javascript"?src="js/lhgcore.js"></script>????<script?type="text/javascript"?src="js/lhgdialog.js"></script>????<script?type="text/javascript">??????function?selflog_show(id)??????{??????????var?num?=??document.getElementById("number").value;??????????J.dialog.get({id:?'haoyue_creat',title:?'購物成功',width:?600,height:400,?		link:?'<%=path%>/servlet/CartServlet?id='+id+'&num='+num+'&action=add',?cover:true});??????}??????function?add()??????{?????????var?num?=?parseInt(document.getElementById("number").value);?????????if(num<100)?????????{????????????document.getElementById("number").value?=?++num;?????????}??????}??????function?sub()??????{?????????var?num?=?parseInt(document.getElementById("number").value);?????????if(num>1)?????????{????????????document.getElementById("number").value?=?--num;?????????}??????}?????????</script>	????<style?type="text/css">	???hr{	?????	?????border-color:FF7F00;?	???}	???	???div{	??????float:left;	??????margin-left:?30px;	??????margin-right:30px;	??????margin-top:?5px;	??????margin-bottom:?5px;	?????	???}	???div?dd{	??????margin:0px;	??????font-size:10pt;	???}	???div?dd.dd_name	???{	??????color:blue;	???}	???div?dd.dd_city	???{	??????color:#000;	???}	???div?#cart	???{	?????margin:0px?auto;	?????text-align:right;?	???}	???span{	?????padding:0?2px;border:1px?#c0c0c0?solid;cursor:pointer;	???}	???a{	??????text-decoration:?none;?	???}	</style>??</head>????<body>????<h1>商品詳情</h1>????<a?href="index.jsp">首頁</a>?>>?<a?href="index.jsp">商品列表</a>????<hr>????<center>??????<table?width="750"?height="60"?cellpadding="0"?cellspacing="0"?border="0">????????<tr>??????????<!--?商品詳情?-->??????????<%??????????????ItemsDAO?itemDao?=?new?ItemsDAO();?????????????Items?item?=?itemDao.getItemsById(Integer.parseInt(request.getParameter("id")));?????????????if(item!=null)?????????????{??????????%>??????????<td?width="70%"?valign="top">?????????????<table>???????????????<tr>?????????????????<td?rowspan="5"><img?src="images/<%=item.getPicture()%>"?width="200"?height="160"/></td>???????????????</tr>???????????????<tr>?????????????????<td><B><%=item.getName()?%></B></td>????????????????</tr>???????????????<tr>?????????????????<td>產(chǎn)地:<%=item.getCity()%></td>???????????????</tr>???????????????<tr>?????????????????<td>價格:<%=item.getPrice()?%>¥</td>???????????????</tr>???????????????<tr>?????????????????<td>購買數(shù)量:<span?id="sub"?onclick="sub();">-</span><input?type="text"?id="number"?name="number"?value="1"?size="2"/><span?id="add"?onclick="add();">+</span></td>???????????????</tr>??????????????</table>?????????????<div?id="cart">???????????????<img?src="images/buy_now.png">???????????????<a?href="javascript:selflog_show(<%=item.getId()%>)"><img?src="images/in_cart.png"></a>???????????????<a?href="servlet/CartServlet?action=show"><img?src="images/view_cart.jpg"/></a>?????????????</div>??????????</td>??????????<%?????????????}??????????%>??????????<%???????????????String?list?="";??????????????//從客戶端獲得Cookies集合??????????????Cookie[]?cookies?=?request.getCookies();??????????????//遍歷這個Cookies集合??????????????if(cookies!=null&&cookies.length>0)??????????????{	??????????????for(Cookie?c:cookies)	??????????????{	??????????????????if(c.getName().equals("ListViewCookie"))	??????????????????{	?????????????????????list?=?c.getValue();	??????????????????}	??????????????}	??????????}????????????????????????????list+=request.getParameter("id")+"#";??????????????//如果瀏覽記錄超過1000條,清零.??????????????String[]?arr?=?list.split("#");??????????????if(arr!=null&&arr.length>0)??????????????{??????????????????if(arr.length>=1000)??????????????????{??????????????????????list="";??????????????????}??????????????}??????????????Cookie?cookie?=?new?Cookie("ListViewCookie",list);??????????????response.addCookie(cookie);????????????????????%>??????????<!--?瀏覽過的商品?-->??????????<td?width="30%"?bgcolor="#EEE"?align="center">?????????????<br>?????????????<b><font?color="#FF7F00">您瀏覽過的商品</font></b><br>?????????????<!--?循環(huán)開始?-->?????????????<%?????????????????ArrayList<Items>?itemlist?=?itemDao.getViewList(list);????????????????if(itemlist!=null&&itemlist.size()>0?)????????????????{???????????????????System.out.println("itemlist.size="+itemlist.size());???????????????????for(Items?i:itemlist)???????????????????{??????????????????????????????????????%>?????????????<div>?????????????<dl>???????????????<dt>?????????????????<a?href="details.jsp?id=<%=i.getId()%>"><img?src="images/<%=i.getPicture()?%>"?width="120"?height="90"?border="1"/></a>???????????????</dt>???????????????<dd?class="dd_name"><%=i.getName()?%></dd>????????????????<dd?class="dd_city">產(chǎn)地:<%=i.getCity()?%>&nbsp;&nbsp;價格:<%=i.getPrice()?%>?¥?</dd>??????????????</dl>?????????????</div>?????????????<%????????????????????}????????????????}?????????????%>?????????????<!--?循環(huán)結(jié)束?-->??????????</td>????????</tr>??????</table>????</center>??</body></html>
<%@?page?language="java"?import="java.util.*"?contentType="text/html;?charset=utf-8"?%><%@?page?import="entity.Cart"?%><%@?page?import="entity.Items"?%><%String?path?=?request.getContextPath();String?basePath?=?request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN"><html>??<head>????<base?href="<%=basePath%>">????????<title>My?JSP?'cart.jsp'?starting?page</title>????	<meta?http-equiv="pragma"?content="no-cache">	<meta?http-equiv="cache-control"?content="no-cache">	<meta?http-equiv="expires"?content="0">????	<meta?http-equiv="keywords"?content="keyword1,keyword2,keyword3">	<meta?http-equiv="description"?content="This?is?my?page">	<!--	<link?rel="stylesheet"?type="text/css"?href="styles.css">	-->	<link?type="text/css"?rel="stylesheet"?href="css/style1.css"?/>????<script?language="javascript">	????function?delcfm()?{	????????if?(!confirm("確認(rèn)要刪除?"))?{	????????????window.event.returnValue?=?false;	????????}	????}???</script>??</head>????<body><h1>我的購物車</h1>???<a?href="index.jsp">首頁</a>?<a?href="index.jsp">商品列表</a>???<hr>????<div?id="shopping">???<form?action=""?method="">					<table>				<tr>					<th>商品名稱</th>					<th>商品單價</th>					<th>商品價格</th>					<th>購買數(shù)量</th>					<th>操作</th>				</tr>				<%?				???//首先判斷session中是否有購物車對象				???if(request.getSession().getAttribute("cart")!=null)				???{				%>				<!--?循環(huán)的開始?-->				?????<%?				?????	?//先獲得一個購物車				?????????Cart?cart?=?(Cart)request.getSession().getAttribute("cart");				?????????//接下來開始遍歷購物車				?????????HashMap<Items,Integer>?goods?=?cart.getGoods();				?????????//先獲得鍵的集合				?????????Set<Items>?items?=?goods.keySet();				?????????Iterator<Items>?it?=?items.iterator();				?????????				?????????while(it.hasNext())				?????????{				????????????Items?i?=?it.next();				?????%>?				<tr?name="products"?id="product_id_1">					<td?class="thumb"><img?src="images/<%=i.getPicture()%>"?/><a?href=""><%=i.getName()%></a></td>					<td?class="number"><%=i.getPrice()?%></td>					<td?class="price"?id="price_id_1">						<span><%=i.getPrice()*goods.get(i)?%></span>						<input?type="hidden"?value=""?/>					</td>					<td?class="number">?????????????????????	<%=goods.get(i)/*獲得否買數(shù)量*/%>										</td>????????????????????????????????????????????<td?class="delete">					??<a?href="servlet/CartServlet?action=delete&id=<%=i.getId()%>"?onclick="delcfm();">刪除</a>					??????????????????					</td>				</tr>				?????<%?				?????????}				?????%>				<!--循環(huán)的結(jié)束-->							</table>			<div?class="total"><span?id="total">總計:<%=cart.getTotalPrice()?%>¥</span></div>			??<%?			????}			%>			<div?class="button"><input?type="submit"?value=""?/></div>		</form>	</div>??</body></html>
<%@?page?language="java"?import="java.util.*"?contentType="text/html;?charset=utf-8"?%><%String?path?=?request.getContextPath();String?basePath?=?request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN"><html>??<head>????<base?href="<%=basePath%>">????????<title>My?JSP?'success.jsp'?starting?page</title>????	<meta?http-equiv="pragma"?content="no-cache">	<meta?http-equiv="cache-control"?content="no-cache">	<meta?http-equiv="expires"?content="0">????	<meta?http-equiv="keywords"?content="keyword1,keyword2,keyword3">	<meta?http-equiv="description"?content="This?is?my?page">	<!--	<link?rel="stylesheet"?type="text/css"?href="styles.css">	-->??</head>????<body>????<center>??????<img?src="images/add_cart_success.jpg"/>??????<hr>??????<%??????????String?id?=?request.getParameter("id");?????????String?num?=?request.getParameter("num");??????%>?????????????您成功購買了<%=num%>件商品編號為<%=id%>的商品&nbsp;&nbsp;&nbsp;&nbsp;??????<br>??????<br>??????<br>??????????</center>??</body></html>


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2 回答

代碼格式整理一下啊。。。這么亂怎么看

0 回復(fù) 有任何疑惑可以回復(fù)我~

代碼格式太亂了,ctrl+shift+F鍵格式化一下代碼再發(fā)出來吧。

0 回復(fù) 有任何疑惑可以回復(fù)我~

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點(diǎn)擊顯示購物車 但出來的卻是添加購物車成功頁面(也就是success頁面)并且數(shù)量顯示null,id也顯示null。不知道代碼哪里出了錯誤

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